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https://dev.mysql.com/doc/refman/8.0/en/innodb-online-ddl-failure-conditions.html
A timeout occurs while waiting for an exclusive lock on the table, which may be needed briefly during the initial and final phases of the DDL operation. The tmpdir or innodb_tmpdir file system runs out of disk space, while MySQL writes temporary ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-optimize-tablespace-page-allocation.html
As of MySQL 8.0.22, you can optimize how InnoDB allocates space to file-per-table and general tablespaces on Linux. As of MySQL 8.0.22, you can disable innodb_extend_and_initialize on Linux systems to avoid physically writing NULLs to newly ...By ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-restrictions-limitations.html
mysql> CREATE TABLE t1 (c1 INT, db_row_id INT) ENGINE=INNODB; ERROR 1166 (42000): Incorrect column name 'db_row_id' SHOW TABLE STATUS does not provide accurate statistics for InnoDB tables except for the physical size reserved by the table. InnoDB ... This section describes restrictions and limitations of the InnoDB storage ...
https://dev.mysql.com/doc/refman/8.0/en/lock-instance-for-backup.html
The BACKUP_ADMIN privilege is automatically granted to users with the RELOAD privilege when performing an in-place upgrade to MySQL 8.0 from an earlier version. WITH READ LOCK; LOCK INSTANCE FOR BACKUP; UNLOCK INSTANCE; UNLOCK TABLES; The ... LOCK ...
https://dev.mysql.com/doc/refman/8.0/en/locking-functions.html
Returns 1 if the lock was obtained successfully, 0 if the attempt timed out (for example, because another client has previously locked the name), or NULL if an error occurred (such as running out of memory or the thread was killed with mysqladmin ...
https://dev.mysql.com/doc/refman/8.0/en/locking-issues.html
MySQL manages contention for table contents using locking: Internal locking is performed within the MySQL server itself to manage contention for table contents by multiple threads. External locking occurs when the server and other programs lock ...
https://dev.mysql.com/doc/refman/8.0/en/myisam-start.html
The following options to mysqld can be used to change the behavior of MyISAM tables. Note If you do this, you should not access MyISAM tables from another program (such as from another MySQL server or with myisamchk) when the tables are in use.
https://dev.mysql.com/doc/refman/8.0/en/myisamchk-repair-options.html
--parallel-recover, -p Command-Line Format --parallel-recover Note This option is deprecated in MySQL 8.0.28 and removed in MySQL 8.0.30. --correct-checksum Command-Line Format --correct-checksum Correct the checksum information for the table.
https://dev.mysql.com/doc/refman/8.0/en/no-matching-rows.html
Remove one table at a time from the query until it returns some rows. If you still cannot figure out what is wrong, create a minimal test that can be run with mysql test < query.sql that shows your problems. You can create a test file by dumping the ... If you have a complicated query that uses many tables but that returns no rows, you should use the following procedure to find out what is wrong: Test the query with EXPLAIN to check whether you can find something that is obviously ...
https://dev.mysql.com/doc/refman/8.0/en/optimization-indexes.html
Although it can be tempting to create an indexes for every possible column used in a query, unnecessary indexes waste space and waste time for MySQL to determine which indexes to use. The best way to improve the performance of SELECT operations is ...