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https://dev.mysql.com/doc/refman/5.7/en/error-handling.html
This appendix describes the types of error information MySQL provides and how to obtain information about them. It describes common problems and errors that may occur and potential resolutions.
https://dev.mysql.com/doc/refman/5.7/en/innodb-performance-use_sys_malloc.html
When InnoDB was developed, the memory allocators supplied with operating systems and run-time libraries were often lacking in performance and scalability. At that time, there were no memory allocator libraries tuned for multi-core CPUs. Therefore, ...This allocator is guarded by a single mutex, which may become a ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-table-handles-table.html
It is autosized by default; to configure the table size, set the performance_schema_max_table_handles system variable at server startup. The Performance Schema exposes table lock information through the table_handles table to show the table locks ...Table lock instrumentation uses the wait/lock/table/sql/handler instrument, which is enabled by ...
https://dev.mysql.com/doc/refman/5.7/en/error-creating-innodb.html
If you already created some InnoDB tables, also delete the corresponding .frm files for these tables, and any .ibd files if you are using multiple tablespaces, from the MySQL database directories. The troubleshooting steps for InnoDB I/O problems ...Initialization Problems If something goes wrong when InnoDB attempts to initialize its tablespace or its log files, delete all files created by InnoDB: all ibdata files and all ib_logfile ...
https://dev.mysql.com/doc/refman/5.7/en/using-spatial-indexes.html
The optimizer investigates whether available spatial indexes can be involved in the search for queries that use a function such as MBRContains() or MBRWithin() in the WHERE clause. The following query finds all objects that are in the given ...
https://dev.mysql.com/doc/refman/5.7/en/federated-create.html
Create the table on the local server with an identical table definition, but adding the connection information that links the local table to the remote table. You can either create the local table and specify the connection string (containing the ...
https://dev.mysql.com/doc/refman/5.7/en/replication-upgrade.html
For example, you cannot use MySQL 5.7.22, MySQL 5.7.24, and MySQL 5.7.28 concurrently in such a setup, although you could use any two of these releases together. If you are upgrading an existing replication setup from a version of MySQL that does ...
https://dev.mysql.com/doc/refman/5.7/en/drop-trigger.html
DROP TRIGGER requires the TRIGGER privilege for the table associated with the trigger. Use IF EXISTS to prevent an error from occurring for a trigger that does not exist. A NOTE is generated for a nonexistent trigger when using IF EXISTS. Triggers ... DROP TRIGGER [IF EXISTS] [schema_name.]trigger_name This statement drops a ...
https://dev.mysql.com/doc/refman/5.7/en/group-replication-examples-of-use-case-scenarios.html
The following examples are typical use cases for Group Replication. Autonomic Systems - Additionally, you can deploy MySQL Group Replication purely for the automation that is built into the replication protocol (described already in this and ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-innodb-buffer-pool-stats-table.html
The INNODB_BUFFER_POOL_STATS table provides much of the same buffer pool information provided in SHOW ENGINE INNODB STATUS output. Much of the same information may also be obtained using InnoDB buffer pool server status variables. For related usage ...The idea of making pages in the buffer pool “young” or “not young” refers to transferring them between the sublists at the head and tail of the buffer pool data ...