Statements that begin like this:. There are some minor implementation differences between the two. GeometryCollection with no arguments is now permitted as a way to create an empty geometry.
The value has been increased from 60 seconds to seconds. It is still possible to dump it by naming it explicitly on the command line for example, mysqldump --databases sys. For named pipe and shared memory connections, attempts to use SSL now produce an error because these connections use non-network protocols. For Unix socket file connections, SSL does not add any security. The connection is permitted, but the mysql client now produces a warning that SSL does not add anything for this transport protocol.
Thanks to Mark Callaghan for the contribution. In addition, two new status variables are available. By default, this variable is empty no engines disabled , but it can be set to a comma-separated list of one or more engines.
MySQL distributions no longer include the sql-bench directory. It provides no measurable benefit, complicates the code, and is problematic for certain architectures such as POWER8. This has been deprecated since MySQL 5. This information is intended to enable applications for example, those that perform load balancing to know when transactions can be moved from one session to another.
The test for this symbol used the wrong name, so the interface did not enable the proper code. These modifications change the service API. Any plugin to be used with this version of MySQL that relies on the service must be recompiled.
A consequence of this change is that previously accepted invalid character data is now rejected, which can cause issues if you replicate from an older server without this bug fix to a newer server with this bug fix. Solutions for this issue include:.
Upgrade the master to a version that has the bug fix so that master and slave interpret the data the same way. InnoDB; Partitioning: In certain rare cases the optimizer pruned all partitions for an InnoDB table but failed to remove the table from consideration as a source for obtaining matches, instead calling for the table to be initialized and prepared for fetching records.
This occurred when the active index was not set during initialization. To fix this problem, we now set the active index ID during initialization even if there are no partitions to select from. This behavior also matches the way the same case is already handled in MySQL 5. InnoDB; Partitioning: Sorted index reads on partitioned InnoDB tables added rows to the prefetch cache, which could cause rows from the wrong partition since the prefetch cache does not support partitioned tables.
Now the prefetch cache is disabled in such cases. InnoDB; Microsoft Windows: General tablespaces created on Windows using a relative data file path could not be opened on Unix-like systems. InnoDB: Functionality required to build adaptive hash indexes on field prefixes was reintroduced to improve sequential insert performance.
The functionality was removed in MySQL 5. The same document ID was used by two cascade operations. InnoDB: In the case of a lock conflict, shutdown could hang waiting for asynchronous rollback to finish.
Mutex statistics collection can now be configured dynamically using the following options:. InnoDB: A tablespace opened locally by a truncate routine was not closed in protected mode. InnoDB: An assertion was raised when truncation logic identified inactive undo tablespaces as candidates for undo log truncation. Some undo tablespaces were left inactive when the number of available undo tablespaces exceeded the number of undo logs.
PATH matched the current value. With an InnoDB page size of 64KB, the first system tablespace data file ibdata1 was not large enough to contain the doublewrite buffer blocks block1 and block2. To ensure that the doublewrite buffer blocks fit within the first system tablespace data file, a minimum data file size is enforced.
InnoDB: Full-text search operations between tables related by a foreign key constraint were not properly cascaded during iterative DML cascading operations.
With one of the remaining undo logs always allocated to the system tablespace, 95 undo logs remained available for allocation to the system tablespace or separate undo tablespaces.
In other words, a limit of 95 available undo logs also limited the maximum number of undo tablespaces to InnoDB: A memory leak occurred when a foreign key constraint object was loaded with the parent table while the child table failed to load. The foreign key constraint object should only be loaded with the child table. InnoDB: A failure to load a change buffer bitmap page during a concurrent delete tablespace operation caused a server exit. Purge should not attempt to clean a table that is marked as corrupt.
Purge now checks for a corrupt primary index. InnoDB: A checksum mismatch error on a crc32 checksum was encountered when restarting the server on a data file copied from a machine with a different endianness. The crc32 checksum should be recognized regardless of the native byte order of the system where the checksum was generated. InnoDB: An assertion was raised during a rollback operation due to a record the was incorrectly undelete-marked. Temporary tables do not support foreign keys.
Invocation of foreign key code is now blocked for optimized temporary tables. The calculation that determines the number of extents to reserve when storing a BLOB did account for compressed pages. FILES table now reports metadata for all InnoDB tablespace types including file-per-table tablespaces, general tablespaces, the system tablespace, the temporary tablespace, and undo tablespaces, if present.
However, these tables continue to provide metadata for file-per-table and general tablespaces. Bug , Bug , Bug , Bug InnoDB: Importing a tablespace with a full-text index resulted in an assertion when attempting to rebuild the index.
The assertion code was too strict. InnoDB: An assertion was raised on server startup when InnoDB tried to create a temporary file in a nonexistent temporary directory tmpdir while in read-only mode.
Now, instead of halting the server, InnoDB only prints an error message. InnoDB: After moving the MySQL data directory and modifying the datadir configuration parameter to point to the new location, tables stored in general tablespaces failed to open because the tablespace data file could not be found.
InnoDB: General tablespaces now support partitioned InnoDB tables, and individual partitions and subpartitions can now be assigned to a general tablespace. InnoDB: Assertion code which checks for the lowest possible page number for a tablespace did not account for general tablespaces. Thanks to Piotr Jurkiewicz for the patch. InnoDB: The following changes were implemented for full-text index auxiliary tables:.
If the primary table is assigned to a general tablespace, full-text auxiliary tables are created in the same general tablespace. Full-text auxiliary tables are created with the same row format as the primary table.
InnoDB: The memcached set command permitted a negative expire time value. Expire time is stored internally as an unsigned integer. A negative value would be converted to a large number and accepted. The debug assertion was removed and the error was replaced by a warning. In debug builds, an assertion is raised.
InnoDB: Estimates for the number of records in a range for a given dataset could differ depending on the page size. InnoDB: Failure to check the status of a cursor transaction read-only option before reusing the cursor transaction for a write operation resulted in a server exit during a memcached workload.
The server was unable to locate undo tablespaces that were created when the MySQL instance was initialized. If a path is not specified, undo tablespaces are created in the MySQL data directory, as defined by datadir. A workaround for pre-MySQL 5. A session holding an exclusive row lock on a clustered index page initiated a page reorganization while another session waited for a lock on the same row.
InnoDB: InnoDB failed to open a tablespace after the data directory location of the tablespace was changed from a relative path to a full path. InnoDB failed to recognize that the relative path, which remained embedded in the data dictionary, pointed to the same data file as the full path.
The regression was due to excessive flushing triggered by a forced checkpoint that occurs after the sorted index build. In pre-MySQL 5. This behaviour changed in MySQL 5. To restore pre-MySQL 5. InnoDB: In debug builds, attempting to create a spatial index after dropping the mysql. Optimized temporary tables, which do not support rollback and are not shared across connections, should ignore the transaction objects.
Queries on optimized temporary tables should not increment the number of active threads. Partitioning: During execution of correlated subqueries, the server reinitialized a scan executed on the same table without ending the previous scan. Partitioning: For an ordered index scan over multiple partitions, MySQL performs a merge sort across them using a priority queue whose entries hold pointers to buffers containing fetched rows.
When all rows from all partitions are fetched, this queue is now empty. When this occurred, subsequent attempts to fetch rows were done by passing a null buffer pointer, which caused the server to fail. PREV against a partitioned table. QUICK could fail when used with multiple partitioned tables.
In previous versions, this meant that the default replication channel did not correctly reset some configuration and status parameters. Bug , Bug , Bug The fix ensures that the statement is correctly displayed. The fix ensures that variables which can only be set outside transaction context can now only be set if the thread does not own a GTID and does not hold anonymous ownership. This changes the behavior of these variables:. Replication: mysqlbinlog would apply any rewrite rules before applying the database filter.
This meant that in cases when statement-based replication transactions were mixed with row-based replication transactions only one or the other type of transaction would be output. This makes it possible to use the --database option on the query and row events. This was caused when the slave SQL thread was flushing the relay log information to the mysql. Replication: If a slave was restarted with --relay-log-recovery enabled and the initialization of the default replication channel had failed, a slave could refuse to start or cause an assert in debug mode.
However, since MySQL 5. So in this case there was no way to reset the GTID state. Replication: If statement based logging was in use, when updating multiple tables in a single statement, a single transaction could be logged as two different transactions. This was due to the binary logging process not properly identifying statements which were operating over transactional tables.
The fix ensures that they are correctly identified, even if such statements do not change the contents of the tables. The fix uses settings unique to each started mysqld instance to ensure that each gets a unique UUID. Replication: When using mysql-test-run. This means that you can change the variable and still be guaranteed that every statement uses the same value for the variable on master and slave, even if the variable is not changed synchronously on master and slave. The fix ensures that the transaction context is calculated after saving the GTID's state, and then commit is executed on any remaining transactions.
This makes the server not activate flags that would then trigger the incorrect run of the routine to handle GTID violating transactions that ultimately resulted in an assertion. Replication: When binary logging was enabled, using stored functions and triggers resulting in a long running procedure that inserted many records caused the memory use to increase rapidly.
This was due to memory being allocated per variable. The fix ensures that in such a situation, memory is allocated once and the same memory is reused. Running the debug version of mysqld caused an unexpected exit in this case. The fix ensures that the recovery process for multithreaded slaves avoids this. Replication: When using semisynchronous replication performance was degrading when the number of threads increased beyond a certain threshold.
To improve performance, now only the thread which is committing is responsible for deleting the active transaction node. All other operations do not touch this active transaction list.
There was a small chance that the thread would miss a signal and not wake up, so that one pass of the compression algorithm would be missed and the table left uncompressed. The fix ensures that the thread wakes up consistently. Replication: Using mysqlbinlog to process log events greater than 1.
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