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Note This is a milestone release, for use at your own risk. Upgrades between milestone releases (or from a milestone release to a GA release) are not supported. Significant development changes take place in milestone releases and you may encounter compatibility issues, such as data format changes that require attention in addition to the usual procedure of running mysqlupgrade. For example, you may find it necessary to dump your data with mysqldump before the upgrade and reload it afterward. (Making a backup before the upgrade is a prudent precaution in any case.). NO PAD collations are those based on UCA 9.0.0 and higher, such as utf8mb40900aici or utf8mb4ja0900ascs. The performance improvement is greatest for key values with short weight strings; that is, strings where the weight strings do not fill their entire permitted length.
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For a column that uses the utf8mb40900aici collation, values may take up to 160 bytes. The string 'a' uses only 2 bytes out of a possible 160 and is more sparse than 'abcdefghij'. But even 'abcdefghij' uses only 20 bytes of a possible 160 and is more sparse than a string of, for example, ten copies of U+337F SQUARE CORPORATION (㍿), whose weight string requires the entire 160 bytes available. (Bug #25750527, Bug #85546). MySQL now supports a new collation, utf8mb40900asci, for the utf8mb4 Unicode character set.
This collation is accent sensitive and case insensitive. It is similar to the default utf8mb4 collation ( utf8mb40900aici) except that the default collation is accent insensitive. MySQL also now supports a new Japanese collation, utf8mb4ja0900ascsks, for the utf8mb4 Unicode character set. This collation is like utf8mb4ja0900ascs in that it is accent sensitive and case sensitive, but utf8mb4ja0900ascsks is also kana sensitive and distinguishes Katakana characters from Hiragana characters. Utf8mb4ja0900ascs treats Katakana and Hiragana characters as equal for sorting.
Applications that require a Japanese collation but not kana sensitivity may use utf8mb4ja0900ascs for better sort performance. Utf8mb4ja0900ascs uses three weight levels for sorting; utf8mb4ja0900ascsks uses four. Utf8mb4ja0900ascsks is the first collation to use the ks collation suffix. Japanese collations without this suffix are not kana sensitive. For more information, see. These character set changes were made to MySQL client support.
These clients use a default character set of utf8mb4 rather than latin1: mysql, mysqlupgrade, mysqladmin, mysqlcheck, mysqldump, mysqlimport, mysqlpump, mysqlslap, mysqlshow, and mysqltest. (This change does not affect character set autodetection performed by mysql, mysqladmin, mysqlcheck, mysqlimport, and mysqlshow, as described at ). Client connections created using the libmysqlclient library use a default character set of utf8mb4 rather than latin1.
The mysqltest program supports a -default-character-set option for specifying the character set explicitly. Performance: The strict aliasing optimization for GCC is no longer disabled, which results in a minor improvement for MySQL single-threaded performance. Linux: MySQL now compiles on Alpine Linux. (Bug #25945568, Bug #80322). Solaris: On Solaris, server builds now use std::atomic, so they must be linked against libstatomic. (Bug #25957991). MySQL now compiles using Visual Studio 2017.
(Bug #25788406). The minimum version of the Boost library for server builds is now 1.64.0. (Bug #25772329, Bug #85593). These changes were made with respect to client program development. Client programs should only need to #include the header file. In particular, should not be needed, and is no longer installed. The function is no longer included in the list of symbols exported from libmysqlclient.
It need not be called explicitly by client programs because it is called implicitly by other C API initialization functions. (Bug #25732787). For the Xcode IDE, header files are added to MySQL project sources so they can be searched. (Bug #25636986).
Work was done to clean up the source code base, including: Removing unneeded CMake checks; removing unused macros from source files; reorganizing header files to reduce the number of dependencies and make them more modular, removing function declarations without definitions, replacing locally written functions with equivalent functions from industry-standard libraries. New services are available to enable server components to register and unregister system variables ( componentsysvariableregister, componentsysvariableunregister) and to register status variables ( statusvariableregistration). Two new services are available to enable server components and plugins to register and unregister user-defined-functions (UDFs): mysqlserviceudfregistration and mysqlserviceudfregistrationaggregate provide registration services for scalar and aggregate UDFs, respectively. These services enable components and plugins to manage UDFs for themselves, without the need for and statements.
UDFs registered using either these services or now are listed in the new Performance Schema table. The mysqlstring string-manipulation service has been converted from a plugin service to a component service: a set of string service APIs for use by server components. The password validation component has been updated to use the revised service implementation. Previously, LOCAL capability for operations was enabled by default in some contexts: The client library in MySQL binary distributions was compiled with client-side LOCAL capability enabled, and the system variable was enabled on the server side.
LOCAL capability is now disabled by default in all contexts. Client programs must be configured explicitly to enable LOCAL, and the server must be run with enabled. (Bug #24511108). mysqld startup behavior has been modified as follows. In general, these changes enable more consistent or easier server startup when not using mysqldsafe. The server executable determines its own full path name at startup and uses the parent of the directory in which it is located as the default value.
Majlis berbuka puasa. This in turn enables the server to use that when searching for server-related information such as the share directory containing error messages. If error log output cannot be redirected to the -log-error option value, error output could be lost. This is now less likely. If the server is started using the -daemonize option and is not connected to a tty device, a default error logging option of -log-error=' is used in the absence of an explicit logging option, to direct error output to the default log file.
Previously, an error could occur under these circumstances. The -D and -I options now are synonyms for and, respectively. (Bug #20398088, Bug #75343). MySQL now supports a variant of SET statement syntax, for making configuration changes at runtime that also persist across server restarts. Like, writes the variable setting to an option file named mysqld-auto.cnf in the data directory.
However, unlike PERSIST, PERSISTONLY does not modify the runtime global system variable value. This makes PERSISTONLY suitable for configuring read-only system variables that only be set can at server startup. For more information, see, and.
Use of requires the new privilege. The system variable is now enabled by default (previously disabled by default), and a warning occurs if you disable it. This means that the nonstandard (and deprecated) behaviors for default values and NULL-value handling in columns are now disabled by default. The columnstats system table has been removed and replaced by the columnstatistics data dictionary table. The version data dictionary table was renamed to ddproperties. Metadata for INFORMATIONSCHEMA tables created by dynamic plugins now is recorded in the data dictionary and visible through the INFORMATIONSCHEMA table. These tables are no longer visible in INFORMATIONSCHEMA: SHOWSTATISTICS, SHOWSTATISTICSDYNAMIC, STATISTICSBASE, STATISTICSDYNAMIC, TABLESDYNAMIC.
User impact is minimal because these tables are for internal use by server components. The InnoDB storage engine now uses the MySQL data dictionary rather than its own storage engine-specific data dictionary.
For information about the data dictionary, see. The following list briefly describes the main implications of this change. To upgrade from MySQL 5.7 to MySQL 8.0, you must perform the upgrade procedure described.
Downgrading from MySQL 8.0 to MySQL 5.7 is only supported using the logical downgrade method (a mysqldump downgrade). In-place downgrades are not supported. Metadata updates associated with exporting and importing tablespaces using the transportable tablespace feature are now performed on global data dictionary tables instead of InnoDB data dictionary tables. InnoDB in-memory metadata is now instantiated from global data dictionary objects. This metadata was previously read from InnoDB system tables. Table options that signify tablespace encryption and transparent page compression are now retrieved from the global data dictionary.
Data dictionary support was added for InnoDB FULLTEXT indexes. Auxiliary index table names were changed to lowercase. InnoDB metadata created or modified during DDL operations is now written to the global data dictionary. mysql system tables and data dictionary tables are now created in a single InnoDB tablespace file named mysql.ibd in the MySQL data directory. Previously, these tables were created in individual InnoDB tablespace files in the mysql database directory. Associated changes include. The InnoDB data dictionary buffer table, which stores fast changing InnoDB metadata, was renamed to innodbdynamicmetadata and moved from the InnoDB system tablespace to the data dictionary tablespace.
Undo tablespace metadata now resides in the data dictionary tablespace. Temporary tablespace metadata now resides in the data dictionary tablespace. Table definitions for tables created in the mysql tablespace, the InnoDB system tablespace ( innodbsystem), or general tablespaces now include a TABLESPACE attribute. This change has the following implications. The server is more forgiving if it cannot find the configured error-message file (specified using the and system variables). Previously, the server wrote a message to the error log to indicate the problem, then aborted the startup process and exited. Now the server writes a message, but continues startup and defaults to built-in English messages.
This applies to messages the server writes to the error log and sends to clients. Error logging was rewritten to use the MySQL component architecture. Traditional error logging is implemented using built-in components, and logging using the system log is implemented as a loadable component. In addition, a loadable JSON log writer is available. To control which log components to enable, use the system variable. For more information, see.
Incompatibility: To enable logging to the system log, you must load the logsinksyseventlog log component and list it in the value (see ). This differs from MySQL 5.7 and earlier, for which logging to the system log is enabled by default on Windows, and on all platforms requires no component loading. A consequence of this configuration change is that the system variable previously used to control logging to the system log is obsolete and changes to its value have no effect. Is now deprecated and will be removed in a future MySQL release.
The statement supports UPDATE HISTOGRAM and DROP HISTOGRAM clauses for generating and removing column histogram statistics. The server stores histogram information in the columnstatistics data dictionary table. Histograms are viewable using the table. The histogramgenerationmaxmemsize system variable controls the amount of memory available for histogram generation. The Performance Schema has a memory/sql/histograms instrument for monitoring memory allocations performed for histogram generation.
mysqldump and mysqlpump have a -column-statistics option to add statements to the output to generate histogram statistics for dumped tables when the dump file is reloaded. For more information, see, and. For MySQL upgrades, it is no longer necessary to run mysqlupgrade to incorporate changes to Performance Schema tables because they are recreated automatically as necessary at server startup. The mysqlsystemtables.sql support script no longer includes SQL statements for Performance Schema table creation because these table definitions are maintained internally. To support dynamic Performance Schema table manipulation, a new component service named pfstableservice is now available.
The Performance Schema default instrumentation settings have changed. The linked OpenSSL library for the MySQL Commercial Server has been updated to version 1.0.2l. Issues fixed in the new OpenSSL version are described. This change does not affect the Oracle-produced MySQL Community build of MySQL Server, which uses the yaSSL library instead. (Bug #26160962).
Previously, any user could execute the statement to discover the XID values for outstanding prepared XA transactions, possibly leading to commit or rollback of an XA transaction by a user other than the one who started it. Now is permitted only to users who have the new privilege, which is expected to be granted only to administrative users who have need for it. This might be the case, for example, for administrators of an XA application if it has crashed and it is necessary to find outstanding transactions started by the application so they can be rolled back.
This privilege requirement does not affect normal commit or rollback of an XA transaction because the user who started it knows its XID. For MySQL uprades, mysqlupgrade grants to users who have the privilege, unless some account is found that already has.
(Bug #17188129). Argument suitability checking was improved for these spatial functions that test geometry relationships:,.
For more information, see, and. As a consequence of this work, performance of spatial relation functions was improved for cases where both arguments contain geometries of one dimensionality; that is, where the GeometryCollection arguments (or one GeometryCollection and another type of geometry) passed to a spatial relation function can be reduced to a MultiPoint, MultiLineString, or MultiPolygon. In those cases, the more complex general GeometryCollection can be avoided. (Bug #22285402, Bug #79406).
The -do-test-list option for mysql-test-run.pl accepts an argument for a file containing tests one per line. Lines in the file are now accepted in any of the following formats: testname testname. Test suitename. Testname suitename. Test path/ to/ test/ file (Bug #25700362).
mysql-test-run.pl and mysqltest are now more restrictive about permitted test case and result file names. Names must consist only of alphanumeric characters ( A-Z, a-z, 0-9), dash ( -), or underscore ( ), and cannot start with dash or underscore.
An error occurs for nonconforming file names. (Bug #25487471). These changes were made to the -xml-report option for mysql-test-run.pl. A tag identifies any test failing on a retry attempt.
Separate statistics and fields are included for skipped and disabled tests. The XML report is created in the build directory if no absolute path is given for out-of-source builds.
For combination runs, a field named variation is included in the tag. Results for all tests belonging to a suite are aggregated within a single tag. Information regarding failures is reported with a brief reason in an attribute named message, along with other details within the tag.
(Bug #25349924). mysql-test-run.pl now supports a -report-unstable-tests option that has these effects. Reports any test that has passed using at least one retry attempt in a separate category called “ Unstable tests” in the summary.
If all failures are due to unstable tests, mysql-test-run.pl produces a warning but exits successfully. Adds a new XML tag to report unstable tests, if the -xml-report option is also specified. (Bug #24473420, Bug #25984429).
mysqltest now supports a replacenumericround command that takes an argument value from 0 to 16 indicating the number of decimals to round numeric values to. This can be used to help prevent result content mismatch errors for tests in which slightly different results are obtained across platforms due to precision differences. Thanks to Daniel Black for the patch. (Bug #23280117, Bug #81399). mysql-test-run.pl now looks for a testname-client.opt file, which is analogous to the testname-master.opt file but for specifying test-specific client options.
(Bug #17084918). and ensure that replication repository information is stored in InnoDB tables, making replication resilient to unexpected halts.
enables the optimal method for generating write set hashes. enables the use of a hash table to avoid repeated table scans when no Primary Key or Primary Key Equivalent (non-null unique secondary index) exists for a table. causes unused binary logs that are older than 30 days to be purged, ensuring storage space is used efficiently. Replication: The Group Replication plugin now notifies other components in the server that some relevant events have happened.
Upon view changes, recovery state updates, network partitioning and primary election, the plugin informs listeners registered in the service registry and notifies them that an event has occurred. These listeners, which could even be other plugins, can then react to these events. Replication: The variable has been added which enables you to control the election of new primaries in single-primary mode. In previous versions primary election was based on the member's UUID, with the lowest UUID elected as the new primary in the event of fail over. Use this variable to assign numeric weights to members to ensure that specific members are elected, for example during scheduled maintenance of the primary or to ensure certain hardware is prioritized.
Replication: The following new system variables have been added to configure Group Replication. The number of undo tablespaces can now be modified at runtime, or when the server is restarted, using the configuration option. Previously, the number of undo tablespaces could only be configured when initializing the MySQL instance and could not be changed afterward.
This change permits the addition of undo tablespaces and rollback segments as the database grows. is enabled by default. When enabled, any undo tablespace that exceeds the threshold value defined by is marked for truncation. The default value was changed from 0 to 2, which means that rollback segments are created in two separate undo tablespaces instead of the InnoDB system tablespace by default.
A minimum of two undo tablespaces is required to permit truncation of undo logs. Setting to 0 is deprecated and will not be supported in a future release. The naming convention used for undo tablespace files is changed from undo NNN to undo NNN, where NNN is the undo space number. The configuration option defines the number of rollback segments per undo tablespace. Previously, was a global setting that specified the total number of rollback segments for the MySQL instance. This change increases the number of rollback segments available for concurrent transactions.
More rollback segments increases the likelihood that concurrent transactions use separate rollback segments for undo logs, resulting in less resource contention. The innodbundologs configuration option is removed.
The configuration option performs the same function and should be used instead. The Innodbavailableundologs status variable is removed. The number of available rollback segments per tablespace may be retrieved using SHOW VARIABLES LIKE 'innodbrollbacksegments';. The and statements now support an optional EXTENDED keyword that causes statement output to include information about hidden columns and indexes that MySQL uses internally and are not accessible by users.
For more information, see, and. Incompatible Change: Plugins such as Group Replication and X Plugin now use the mysql.session account added in this version. If you are upgrading from a previous version which did not include the mysql.session account you must run mysqlupgrade to ensure the account is created. If mysqlupgrade is not run, plugins fail to start with the error message There was an error when trying to access the server with user: mysql.session@localhost. Make sure the user is present in the server and that mysqlupgrade was run after a server update.
Previously used users, such as mysqlxsys, are no longer created. (Bug #26042764) References: See also: Bug #24311527, Bug #25642343, Bug #25750822, Bug #25103980, Bug #83841. InnoDB: Queries run on performed more slowly with informationschemastats set to latest.
(Bug #26197113). InnoDB: An operation that specified a DATA DIRECTORY clause failed to ignore the TABLESPACE attribute of the table. (Bug #26113652). InnoDB: When is disabled, a child table with a foreign key constraint can be created before the parent table, which can result in a foreign key constraint failure, as the parent table is unaware of the constraint. When a table is created, there is now a call to load foreign key constraints for the table and check for child tables. (Bug #25976199). InnoDB: A parsing error occurred while optimizing a table with a full-text index.
(Bug #25914332). InnoDB: Compiling MySQL on Windows with Microsoft Visual C 2015 or macOS 10.12.4 with GCC 4.2.1 or Apple LLVM version 8.0.0 (clang-800.0.38) returned warnings. (Bug #25910531).
InnoDB: In debug builds, an assertion was raised during bootstrap when the system tablespace file ( ibdata1) ran out of space during creation of doublewrite pages. (Bug #25872368). InnoDB: Incorrect locking order caused a deadlock when InnoDB attempted to persist an auto-increment counter value to disk. (Bug #25833228). InnoDB: Internal methods for accessing dictionary table object data did not account for virtual columns. (Bug #25822154) References: This issue is a regression of: Bug #23748128.
InnoDB: The length of a virtual column field in a virtual index record was less than the expected template column length. (Bug #25793677).
InnoDB: In debug builds, shutting down the server with raised an assertion. (Bug #25756224). InnoDB: The ibd2sdi utility exited when run on an unsupported file type. (Bug #25738491).
InnoDB: InnoDB did not set the compression algorithm when opening a partitioned table. (Bug #25685868).
InnoDB: An in-place operation failed to set the encryption type, causing a operation to assert. (Bug #25672779). InnoDB: A latch that was held while registering a file close caused a hang condition.
(Bug #25658467). InnoDB: During recovery, prepared transactions were rolled back if the setting was greater than 0. (Bug #25651042). InnoDB: A operation that defined a unique key with an eight character prefix on a NOT NULL field would raise an assertion if a primary key was not defined.
(Bug #25647413). InnoDB: Updates to data dictionary tables combined with updates to InnoDB system tables for full-text search auxiliary tables raised a lock-related assertion. (Bug #25610353). InnoDB: The server allocated memory unnecessarily for an operation that rebuilt the table. (Bug #25573565, Bug #85043).
InnoDB: Test-related code intended to simulate a random read on a nonexistent page raised an invalid assertion. (Bug #25479538) References: This issue is a regression of: Bug #25053705.
InnoDB: With disabled, InnoDB incorrectly printed messages to the error log when operations were performed on a table that referenced a nonexistent foreign key. (Bug #25365223). InnoDB: A or operation could raise an assertion following a failed online operation. The index root page was dropped prematurely. (Bug #25357789). InnoDB: During a operation on a file-per-table tablespace, a dictionary operation lock was released before eviction of dirty pages from the buffer pool, causing a latch order violation. (Bug #25357789).
InnoDB: When using an index merge optimizer switch, a SELECT COUNT(.) operation sometimes returned 0. Partitioning code incorrectly performed a memcpy instead of a column copy of columns read by the index, causing the wrong records to be copied.
(Bug #25332330, Bug #81031). InnoDB: After a operation that moved a table to a different schema, InnoDB returned an error on restart indicating that it could not locate the tablespace data file. InnoDB failed to update INNODBSYSDATAFILES data dictionary table during the operation. (Bug #25189192, Bug #84038). InnoDB: During an operation that rebuilt a table containing a virtual column, InnoDB failed to apply a concurrent insert log record. (Bug #24961167). InnoDB: InnoDB failed to apply the concurrent delete log for an in-place operation due to a virtual column validation issue.
(Bug #24960450). Partitioning: Following execution of an statement, names of tablespaces used by the table were not preserved, and subsequent accesses to the table eventually caused the server to fail. (Bug #25512556). Replication: When replicating a partitioned table with an index, on a replication slave where HASHSCAN was specified as part of the setting, the slave I/O thread sometimes stopped with an error HAERRKEYNOTFOUND. (Bug #26137159). Replication: A statement that followed a SET GTIDNEXT statement sometimes had no effect.
(Bug #26128931). Replication: A misleading warning was issued when the command FLUSH LOGS or PURGE LOGS BEFORE was used on a binary log file with an expiry time set, and the binary log file was in use. The warning related to the file being in use, and implied that a purge attempt had taken place, even if the expiry time had not yet been reached. Now, MySQL checks the expiry time of the binary log file first, and only then checks whether the file is in use. So the warning is only issued for an in-use binary log file that is old enough to be purged. (Bug #25973525). Replication: Groups can now contain members running different server versions to enable you to do online upgrades of a replication group.
The rules for combining members in a group with different versions are. If you have a group with 8.0 members, you cannot add a 5.7 member.
If you have a group with 5.7 members you can add a 8.0 member, but it remains in read-only mode. Writing to this member is dangerous while the group contains multiple server versions and should be avoided. In a single-primary group, if the current primary leaves the group and a new primary must be elected, the primary is first chosen from the lower version members. If no lower version member is found, the primary is chosen from newer version members. (Bug #25876807). Replication: When was set on a MySQL server after startup, and then Group Replication was started, if an error occurred, the server remained in RECOVERING state and could not be shut down. (Bug #25793366, Bug #85667).
Replication: Now that XA transactions are prepared and committed in two parts, an issue with statement-based replication has been identified. If two XA transactions committed on the master are being prepared on the slave in the inverse order, locking dependencies can occur that cannot be safely resolved. The issue is not present with row-based replication.
XA transactions are therefore now considered unsafe for statement-based replication. When binlogformat = STATEMENT, a warning is issued for DML statements inside XA transactions, and replication might fail with deadlock on slaves. When binlogformat = MIXED, DML statements inside XA transactions are logged using row-based replication.
When binlogformat = ROW, DML statements inside XA transactions are logged as before. (Bug #25786490, Bug #85639). Replication: The following Performance Schema replication tables now continue to be populated when the Performance Schema is disabled.
The exception is local timing information (start and end timestamps for transactions) in the replication tables, and. This information is not collected when the Performance Schema is disabled. (Bug #25694813). Replication: In a Group Replication setup where circular asynchronous replication was implemented between members of different replication groups, view change log events were repeatedly replicated between the groups with new generated GTIDs each time.
The fix ensures that view change log events are ignored outside the named replication group where they occur, and never generate new GTIDs. (Bug #25674926) References: See also: Bug #26049695, Bug #25928854, Bug #25721175. Replication: When first starting the MySQL server following an installation from RPM, passwword validation plugin is activated by default (true only for RPM installations). If binary logging was already enabled at this time, the activation was logged, even though plugin activations should not be recorded in the binary log. (Bug #25672750). Replication: The XA START, XA END, XA COMMIT, and XA ROLLBACK statements, used to perform XA transactions, were incrementing the counter for a replicate-do-db filter that named the relevant database. The counter is no longer incremented for these statements.
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(Bug #25669344). Replication: In a setup where single-primary Group Replication was combined with asynchronous replication, for example with S1 and S2 forming a group and with S2 and S3 functioning as master and slave, secondaries such as S2 were accepting transactions and these could then enter the group. The fix prevents secondaries creating an asynchronous replication channel when belonging to a single-primary group, and Group Replication cannot be started when asynchronous replication is running. (Bug #25574200, Bug #85047) References: See also: Bug #86325, Bug #26078602. Replication: Group Replication failed to start if the system variable was enabled.
(Bug #25481287, Bug #84733). Replication: MySQL 8.0 servers were not able to join a replication group that contained MySQL 5.7 servers, and MySQL 5.7 servers in a replication group could not be upgraded to MySQL 8.0. (Bug #25477979). Replication: In the event that a member failed to join a group the member was not stopping and continued to accept transactions. To avoid this set your members to have superreadonly=1 in the my.cfg file.
Group Replication now checks for this setting upon successful start up and sets superreadonly=0. This ensures that members which do not successfully join a group cannot accept transactions.
(Bug #25474736, Bug #84728). Replication: When mysqlbinlog output from a MySQL 5.7 server was applied on a MySQL 8.0 server, the MySQL 8.0 server generated its own timestamp for the. The fix ensures that the value of is correctly set to 0, meaning that the timestamp is not known.
(Bug #25316086). Replication: If the server was started with the option, discovery of one Performance Schema table with invalid structure caused all subsequently checked Performance Schema tables to be marked invalid as well. (Bug #25041396).
Replication: Interleaved transactions could sometimes deadlock the slave applier when the transaction isolation level was set to. (Bug #25040331). Replication: The system variable did not permit error numbers larger than 3000. Thanks to Tsubasa Tanaka for the patch. (Bug #24748639, Bug #83184). Replication: The SQL state of was HY00, which is generic and not suitable for rollback.
The SQL state has been modified to 40000. (Bug #24658431). Replication: mysqlbinlog, if invoked with the option, does not flush the output file until the process terminates. But if also invoked with the option, the process never terminates, thus nothing is ever written to the output file.
Now the output is flushed after each event. (Bug #24609402). Replication: A memory leak in mysqlbinlog was fixed. The leak happened when processing fake rotate events, or when using -raw and the destination log file could not be created. The leak only occurred when processing events from a remote server. Thanks to Laurynas Biveinis for his contribution to fixing this bug.
(Bug #24323288, Bug #82283). Replication: Loading and initialization of the Group Replication plugin failed if no root account was present. (Bug #24311527) References: See also: Bug #25750822, Bug #25103980, Bug #83841. Replication: A slave server could lose events not yet applied when MASTERAUTOPOSITION=0, both replication threads were stopped, and the applier delay was changed using. (Bug #23203678, Bug #81232) References: See also: Bug #25340185, Bug #84375.
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Replication: Transmission of large GCS messages could take so long the sender appeared to have died. (Bug #22671846). Replication: Multithreaded slaves could not be configured with small queue sizes using if they ever needed to process transactions larger than that size.
Any packet larger than was rejected with the error ERMTSEVENTBIGGERPENDINGJOBSSIZEMAX, even if the packet was smaller than the limit set. With this fix, becomes a soft limit rather than a hard limit. If the size of a packet exceeds but is less than, the transaction is held until all the slave workers have empty queues, and then processed. All subsequent transactions are held until the large transaction has been completed. The queue size for slave workers can therefore be limited while still allowing occasional larger transactions. (Bug #21280753, Bug #77406). Replication: An incident event that broke replication was not written to the binary log with a GTID, so that it was not possible to skip the event using.
Instead, it was necessary to set the relay log file and relay log positions directly; this meant that, when autopositioning was enabled, it was necessary first to disable it, then to set the relay log file and position, and finally to re-enable autopositioning. Now in such cases MySQL writes the incident event into the statement cache, so that a GTID is generated and written for it prior to flushing, and that the slave applier works with the change. Then users can skip the event using the SQL statement, followed by and. (Bug #19594845). Replication: Issuing following a restart of a server using group replication led to an unplanned shutdown. (Bug #85739, Bug #25813258). Replication: Setting an empty filter rule using caused issues when running tests with UBSan.
(Bug #85405, Bug #25702297). Replication: When the receiver thread held a lock on the relay log while queuing an event, clients executing or were blocked.
(Bug #85084, Bug #25584734). Replication: Indexes for the Performance Schema table worked correctly only for single threaded replication. This was due to the fact that the indexing relied exclusively on the SQL thread ID regardless of the existence of any workers. Now in such cases, the index also considers worker thread ID when multithreading is enabled on the slave. (Bug #84646, Bug #25444610). Replication: In certain cases, the master could write to the binary log a lastcommitted value which was smaller than it should have been.
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This could cause the slave to execute in parallel transactions which should not have been, leading to inconsistencies or other errors. (Bug #84471, Bug #25379659). Replication: When using, IPs in the private network are permitted automatically, but some class C IP addresses were not being permitted correctly. (Bug #84329, Bug #25503458). Replication: When an existing GTIDNEXT transaction was assigned a conflicting GTID by the server, Group Replication generated an assert upon detecting two transactions with same GTID. This was because Group Replication generates the GTID after conflict detection, which is later than with master/slave replication.
The fix relaxes some conditions to only be called when commit is done and a message has been added to alert you when a GTID has already been used. (Bug #84153, Bug #25232042). Replication: The replication applier thread returns Error 3002 when there is a difference between an expected error number and the actual error number. It is now possible to ignore this error by using 3002 with.
(Bug #83186, Bug #24753281). Replication: MySQL lost its GTID position following a restart when a dump from mysqldump had been used to load data. To keep this problem from occurring, the mysql.gtidexecuted table is now excluded automatically from dumps made by mysqldump. (Bug #82848, Bug #24590891) References: See also: Bug #87455, Bug #26643180. Replication: It was possible to set without causing an error when there were open temporary tables. (Bug #82467, Bug #24411680).
Replication: Corruption of relay logs for one channel in multi-source replication caused good channels not to be initalized during a server restart. In addition, when run with, the server also failed to start slave threads for those channels which were in good condition, despite the fact that it should have started the slave threads for all good channels. Now, regardless of any errors on other channels, the server attempts to create and initialize channels that are in good condition, and starts slave threads for the good channels if -skip-slave-start is disabled.
As part of this fix, and, which are intended to operate on all channels, are also modified such that they continue executing on all good channels even if they find bad channels among them. (Bug #82209, Bug #24285104). Replication: The SQL thread was unable to GTID skip a partial transaction. (Bug #81119, Bug #25800025). Replication: It was possible for to write a Rotatelogevent into an uninitialized log file. (Bug #80368, Bug #22732184) References: See also: Bug #23531998, Bug #81734. Microsoft Windows: On Windows, the Docs/INFOSRC file was missing the build-date entry.
(Bug #25799855). JSON: failed with an assertion error in debug builds if the result from this function was used in a JSON context. This result can now be used safely as a JSON value. This fix includes using DBUGASSERT for handling this error instead of DBUGABORT, which caused debugging problems on some platforms. (Bug #25818544) References: See also: Bug #21383497, Bug #21383530. JSON: The internal Jsonarray now uses a std::vector instead of a Preallocedarray to store its elements, which reduces the amount of heap space required by them.
(Bug #85877, Bug #25867454). The mysqldpresystemd script in RPM packages found the error log setting in option files if specified as log-error but not as logerror, though both are permitted. (Bug #26148391, Bug #86466). ALTER TABLE. ADD PARTITION statements could cause a server exit. (Bug #26132947).
did not work for X Plugin system variables. (Bug #26115672). privilege checking could use the incorrect database in some cases.
(Bug #26106655). With the system variable not set in a.cnf option file or on the command-line, the server failed to restart after using or to set to ONPERMISSIVE. (Bug #26085712). During prepared statement execution, too many bytes of a buffer could be read. (Bug #26042934, Bug #85937). Dynamic privileges were not loaded when the server was started using the option.
(Bug #26005645). Debian client packages were missing information about conflicts with akonadi-backend-mysql packages.
(Bug #26002288). mysqldump could write database names in statements incorrectly. (Bug #25998635). If the C API function was called, it freed memory that later could be accessed if, or was called.
To obtain error information after a call to, call, or instead. (Bug #25988681). Upgrading from MySQL 5.7 to MySQL 8.0 failed during data dictionary creation due to table names that exceeded the 64 character length limit. (Bug #25973237, Bug #86120). Queries could be cached incorrectly, leading to incorrect query results, under these circumstances: InnoDB table; rows are being inserted but have not yet been committed; a query uses the table as a base table in a derived table; the optimizer chooses to materialize the derived table. (Bug #25943038, Bug #86047). mysqld misbehaved if compiled with AddressSanitizer enabled and invoked with (that is, with an empty option value).
(Bug #25914296, Bug #85994). The, and functions did not allow data that originated from a column. (Bug #25912557, Bug #85981).
Attempting to drop a data file from a tablespace with multiple data files returned a duplicate file name error. (Bug #25858461). An attribute was added to data dictionary client method declarations to generate compilation warnings when return values are ignored. (Bug #25840927).
The data dictionary class hierarchy was simplified. (Bug #25835968, Bug #85811). A restriction that prevented the data dictionary object update function ( Dictionaryclient::update) from being called twice on the same object was removed. (Bug #25833932, Bug #85800). On Ubuntu platforms, the MySQL service script did not terminate correctly if the user running the script did not have permission to access the data directory or PID file. (Bug #25825833). String comparison queries on the INFORMATIONSCHEMA.CHARACTERSETS.DESCRIPTION field were case sensitive, which is a regression from earlier releases.
(Bug #25824297). Man pages for a few utilities were missing from Debian/Ubuntu packages. (Bug #25811814). An view executed in mode, using the isolation level, and with disabled, failed to use non-locking reads, which could block DDL operations or cause deadlocks. (Bug #25811413). Table locking failures could occur if tables were used by a trigger for which a trigger of the same name existed in another database and the database names differed only in lettercase.
(Bug #25807393). An in-place MySQL upgrade failed if a.TRG file was missing the created line for the trigger definition.
(This problem is unlikely to occur for upgrades to MySQL 8.0 from 5.7 because the created line is present for MySQL 5.7.2 and higher.) (Bug #25805260, Bug #85704). The field-t unit test failed to run with AddressSanitizer enabled. Thanks to Laurynas Biveinis for the patch. (Bug #25803823, Bug #85678).
Debian client packages were missing information about conflicts with native packages. (Bug #25799475). The CREATEOPTIONS column of the table was treated as having the binary collation, so functions such as and did not have the intended result. (Bug #25793429). After importing a table with column, accessing the table raised an assertion. (Bug #25792649).
could fail when the default character set changed to utf8mb4 due to incorrect column length calculations. (Bug #25779239, Bug #85614).
If a server component deinit method failed, the component was still unloaded. (Bug #25764325). Stored program execution could fail for DEFINER accounts with expired passwords even if they were locked and could not be used to connect to the server. Now DEFINER accounts are not checked for expired passwords if they are locked. (Bug #25741966).
DISTINCT operations on temporary tables could produce incorrect results due to allocation of too-small comparison keys. (Bug #25740550, Bug #85518). In optimizer trace output, numtmpfiles did not actually indicate number of files.
It has been renamed to numinitialchunksspilledtodisk and indicates the number of chunks before any merging has occurred. (Bug #25733784, Bug #85487).
The Perl path in #! Lines at the beginning of Perl scripts has been adjusted to /usr/local/bin/perl for FreeBSD 11.
(Bug #25719975). With the SQL mode enabled, syntax error messages always reported line 1 as the line number. (Bug #25717617). mysqldump failed to properly quote certain identifiers in SQL statements written to the dump output. (Bug #25717383). Dropping a tablespace without that associated tablespace file failed with an error stating that the tablespace dictionary object is invalid. (Bug #25717019).
Client preauthorization by the server was missing a length check for a length-encoded string. (Bug #25714674). In debug builds, a operation raised an invalid assertion when using the NDB storage engine. A validation function that checked for zero-length data files did not apply to NDB tablepaces and was removed.
(Bug #25700242). For debug builds, operations could raise an assertion for some arguments.
(Bug #25688192). For debug builds, the assertion added for Bug#59686 was too strict and could be raised when it should not have been. (Bug #25685958) References: See also: Bug #59686. A code refactoring in MySQL 8.0.1 caused several assertions to be raised in debug builds. (Bug #25669590, Bug #25669606, Bug #25669580, Bug #25688504) References: This issue is a regression of: Bug #25221172, Bug #84103. For some double-precision calculations, overflow could occur when calculating the exponent part.
(Bug #25664323, Bug #85290). output was inconsistent for a FULLTEXT index defined on multiple columns. (Bug #25659276). During a group commit, the stack could incorrectly be reported exhausted, leading to stack overflow. (Bug #25656875).
When the character set of one string comparison operand was a superset of the character set of the other operand, some comparisons were disallowed that should be permitted by converting the operand with the “ smaller” character set to the “ larger” character set. Utf8mb4 and utf32 are considered to be a superset of any other encoding. (Bug #25642319, Bug #85224). An in-place (binary) upgrade could change the default charactersetclient and charactersetconnection variables for stored routines, possibly resulting in different routine behavior. (Bug #25633041).
For debug builds, the partitioning handler could inappropriately evaluate generated column expressions in UPDATE statements, resulting in a raised assertion. (Bug #25615803, Bug #85179).
In strict SQL mode, an error could be converted from a warning to an error but then ignored, leading to a raised assertion. (Bug #25586959, Bug #25586673).
Failure occurred for on an ARCHIVE table containing a NOT NULL column having a geometry data type. For debug builds, an assertion was raised. For non-debug builds, an error occurred. (Bug #25582178, Bug #85059). For debug builds, an assertion could be raised for of a trigger for a table used by a view.
(Bug #25581925). For upgrades from MySQL 5.7 to MySQL 8.0, the server wrote unnecessary parsing warnings to the error log. These messages are now suppressed.
(Bug #25518436, Bug #84889). The server exited abnormally attempting to access invalid memory. (Bug #25501659).
The maximum length of the name field in the columntypeelements table in the data dictionary was extended from 255 bytes to 1020 bytes to accommodate long ENUM and SET values that could result from using a multibyte character set. When using a multibyte character set, a single ENUM or SET element occupies a maximum of M x w bytes in the column type definition in the data dictionary, where M is the element literal length and w is the number of bytes required for the maximum-length character in the character set. In prior releases, the maximum supported length of an individual ENUM or SET element depended on the number of elements in the type. Thus, there could be a single element with ( M x w) = 64K, or 64K elements with ( M x w) = 1.
The maximum supported length of an individual ENUM or SET element is now M.