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https://dev.mysql.com/doc/refman/5.7/en/midpoint-insertion.html
If the block stays at the beginning of the sublist for a long enough time, it is demoted to the warm sublist. This time is determined by the value of the key_cache_age_threshold component of the key cache. The midpoint insertion strategy helps to ...
https://dev.mysql.com/doc/refman/5.7/en/where-optimization.html
At one time, a scan was used based on whether the best index spanned more than 30% of the table, but a fixed percentage no longer determines the choice between using an index or a scan. This section discusses optimizations that can be made for ...
https://dev.mysql.com/doc/refman/5.7/en/set-password.html
SET PASSWORD [FOR user] = password_option password_option: { 'auth_string' | PASSWORD('auth_string') } The SET PASSWORD statement assigns a password to a MySQL user account. = PASSWORD('auth_string') syntax is deprecated in MySQL 5.7 and is removed ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-option-tables.html
ndb-wait-connected: Time (in seconds) for MySQL server to wait for connection to cluster management and data nodes before accepting MySQL client connections. ndb-wait-setup: Time (in seconds) for MySQL server to wait for NDB engine setup to complete. Ndb_api_wait_exec_complete_count: Number of times thread has been blocked while waiting for operation execution to complete by this MySQL Server (SQL ... The ...
https://dev.mysql.com/doc/refman/5.7/en/show-triggers.html
This is a TIMESTAMP(2) value (with a fractional part in hundredths of seconds) for triggers created in MySQL 5.7.2 or later, NULL for triggers created prior to 5.7.2. row *************************** Trigger: ins_sum Event: INSERT Table: account ...
https://dev.mysql.com/doc/refman/5.7/en/session-state-tracking.html
A client can enable these trackers to receive notification of changes to its session state. Uses for Session State Trackers Available Session State Trackers C API Session State Tracker Support Test Suite Session State Tracker Support Uses for ...
https://dev.mysql.com/doc/refman/5.7/en/functions.html
Expressions can be used at several points in SQL statements, such as in the ORDER BY or HAVING clauses of SELECT statements, in the WHERE clause of a SELECT, DELETE, or UPDATE statement, or in SET statements. Expressions can be written using values ...
https://dev.mysql.com/doc/refman/5.7/en/replication-howto-additionalslaves.html
Alternatively, if you have already tried to start the new replica after following the remaining steps in this section and have encountered errors like those described previously, then perform the following steps: If you have not already done so, ...
https://dev.mysql.com/doc/refman/5.7/en/repair-table-optimization.html
Set the variable to the maximum file size for your system, after checking to be sure that there is enough free space to hold a copy of the table files. REPAIR TABLE for MyISAM tables is similar to using myisamchk for repair operations, and some of ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-performance-compression-oltp.html
The rise of SSD storage devices, which are fast but relatively small and expensive, makes compression attractive also for OLTP workloads: high-traffic, interactive websites can reduce their storage requirements and their I/O operations per second ...