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https://dev.mysql.com/doc/refman/8.0/en/optimizing-myisam-bulk-data-loading.html
For a MyISAM table, you can use concurrent inserts to add rows at the same time that SELECT statements are running, if there are no deleted rows in middle of the data file. Use the following procedure: Execute a FLUSH TABLES statement or a ... These ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-metadata-locks-table.html
MySQL uses metadata locking to manage concurrent access to database objects and to ensure data consistency; see Section 10.11.4, “Metadata Locking”. Lock requests that have timed out and are waiting for the requesting session's lock request to ...Metadata locking applies not just to tables, but also to schemas, stored programs (procedures, functions, triggers, scheduled events), tablespaces, user locks acquired with the GET_LOCK() function (see Section 14.14, “Locking Functions”), and locks acquired with the locking service described in Section 7.6.9.1, “The Locking ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-status-variables.html
Performance Schema status variables have the following meanings: Performance_schema_accounts_lost The number of times a row could not be added to the accounts table because it was full. Performance_schema_hosts_lost The number of times a row could ...Performance_schema_digest_lost The number of digest instances that could not be instrumented in the events_statements_summary_by_digest ...
https://dev.mysql.com/doc/refman/8.0/en/error-log-components.html
From MySQL 8.0.30, log_error_services also implicitly loads error log components if they are not already loaded. Whether the component can be listed multiple times in the log_error_services value. If log_sink_json is named multiple times in the ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-innodb-cmp-per-index-table.html
COMPRESS_TIME The total time in seconds used for compressing data in this index. Compressed InnoDB pages are uncompressed whenever compression fails, or the first time a compressed page is accessed in the buffer pool and the uncompressed page does ... The INNODB_CMP_PER_INDEX and INNODB_CMP_PER_INDEX_RESET tables provide status information on operations related to compressed InnoDB tables and indexes, with separate statistics for each combination of database, table, and index, to help you evaluate the performance and usefulness of compression for specific ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-partitions-table.html
UPDATE_TIME The time that the partition or subpartition was last modified. CHECK_TIME The last time that the table to which this partition or subpartition belongs was checked. For each such row: The SUBPARTITION_NAME, SUBPARTITION_ORDINAL_POSITION, ...Each row in this table corresponds to an individual partition or subpartition of a partitioned ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-performance-midpoint_insertion.html
Both innodb_old_blocks_pct and innodb_old_blocks_time can be specified in the MySQL option file (my.cnf or my.ini) or changed at runtime with the SET GLOBAL statement. The pages are moved to the front of the list (the most-recently used end) when ...
https://dev.mysql.com/doc/refman/8.0/en/kill.html
KILL [CONNECTION | QUERY] processlist_id Each connection to mysqld runs in a separate thread. You can also use the mysqladmin processlist and mysqladmin kill commands to examine and kill threads. In most cases, it might take some time for the ...
https://dev.mysql.com/doc/refman/8.0/en/replication-mode-change-online-verify-transactions.html
Or wait for a day, or whatever time period you consider safe for your deployment. This section explains how to monitor a replication topology and verify that all anonymous transactions have been replicated. This is helpful when changing the ...
https://dev.mysql.com/doc/refman/8.0/en/show-triggers.html
For the ins_sum trigger defined in Section 27.3, “Using Triggers”, the output of SHOW TRIGGERS is as shown here: mysql> SHOW TRIGGERS LIKE 'acc%'\G *************************** 1. This is a TIMESTAMP(2) value (with a fractional part in hundredths ... SHOW TRIGGERS [{FROM | IN} db_name] [LIKE 'pattern' | WHERE expr] SHOW TRIGGERS lists the triggers currently defined for tables in a database (the default database unless a FROM clause is ...