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https://dev.mysql.com/doc/refman/5.7/en/performance-schema-table-wait-summary-tables.html
The table_io_waits_summary_by_table table has these grouping columns to indicate how the table aggregates events: OBJECT_TYPE, OBJECT_SCHEMA, and OBJECT_NAME. The only difference is the additional group column, INDEX_NAME, which corresponds to the ... The following sections describe the table I/O and lock wait summary tables: table_io_waits_summary_by_index_usage: Table I/O waits per index table_io_waits_summary_by_table: Table I/O waits per table table_lock_waits_summary_by_table: Table lock waits per table 25.12.15.7.1 The table_io_waits_summary_by_table Table The table_io_waits_summary_by_table table aggregates all table I/O wait events, as generated by the wait/io/table/sql/handler ...
https://dev.mysql.com/doc/refman/5.7/en/internal-temporary-tables.html
Evaluation of statements that contain an ORDER BY clause and a different GROUP BY clause, or for which the ORDER BY or GROUP BY contains columns from tables other than the first table in the join queue. In some cases, the server creates internal ...
https://dev.mysql.com/doc/refman/5.7/en/using-encrypted-connections.html
Several configuration parameters are available to indicate whether to use encrypted connections, and to specify the appropriate certificate and key files. This section provides general guidance about configuring the server and clients for encrypted ...
https://dev.mysql.com/doc/refman/5.7/en/pam-pluggable-authentication.html
Proxy user support: PAM authentication can return to MySQL a user name different from the external user name passed by the client program, based on the PAM groups the external user is a member of and the authentication string provided. Optionally, ... Note PAM pluggable authentication is an extension included in MySQL Enterprise Edition, a commercial ...
https://dev.mysql.com/doc/refman/5.7/en/commit.html
SET autocommit disables or enables the default autocommit mode for the current session. This means that, when not otherwise inside a transaction, each statement is atomic, as if it were surrounded by START TRANSACTION and COMMIT. You cannot use ...
https://dev.mysql.com/doc/refman/5.7/en/faqs-replication.html
In the following section, we provide answers to questions that are most frequently asked about MySQL Replication. Must the replica be connected to the source all the time? A.14.2. Must I enable networking on my source and replica to enable ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-memcached-porting-mysql.html
Consider these aspects of memcached applications when adapting an existing MySQL schema or application to use the daemon_memcached plugin: memcached keys cannot contain spaces or newlines, because these characters are used as separators in the ...
https://dev.mysql.com/doc/refman/5.7/en/monitor-innodb-mutex-waits-performance-schema.html
A mutex is a synchronization mechanism used in the code to enforce that only one thread at a given time can have access to a common resource. When two or more threads executing in the server need to access the same resource, the threads compete ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-limitations-limits.html
In this section, we list limits found in NDB Cluster that either differ from limits found in, or that are not found in, standard MySQL. Memory consumed when data is inserted into an NDB table is not automatically recovered when deleted, as it is ...
https://dev.mysql.com/doc/refman/5.7/en/partitioning-management-hash-key.html
Tables which are partitioned by hash or by key are very similar to one another with regard to making changes in a partitioning setup, and both differ in a number of ways from tables which have been partitioned by range or list. For that reason, ...