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https://dev.mysql.com/doc/refman/5.7/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_digest_lost The number of digest instances ...This can be nonzero if the value of performance_schema_digests_size is too ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-timing.html
Performance Schema Timers Two Performance Schema tables provide timer information: performance_timers lists the available timers and their characteristics. For example, the standard gettimeofday() function can take hundreds of cycles, which is an ...
https://dev.mysql.com/doc/refman/5.7/en/user-resources.html
Only statements that modify databases or tables count against the update limit. An “account” in this context corresponds to a row in the mysql.user system table. That is, a connection is assessed against the User and Host values in the user ...
https://dev.mysql.com/doc/refman/5.7/en/fulltext-search-ngram.html
Creating a FULLTEXT Index that Uses the ngram Parser To create a FULLTEXT index that uses the ngram parser, specify WITH PARSER ngram with CREATE TABLE, ALTER TABLE, or CREATE INDEX. The following example demonstrates creating a table with an ngram ... The built-in MySQL full-text parser uses the white space between words as a delimiter to determine where words begin and end, which is a limitation when working with ideographic languages that do not use word ...
https://dev.mysql.com/doc/refman/5.7/en/slow-query-log.html
Administrative statements include ALTER TABLE, ANALYZE TABLE, CHECK TABLE, CREATE INDEX, DROP INDEX, OPTIMIZE TABLE, and REPAIR TABLE. Note If you specify the TABLE log destination, see Log Tables and “Too many open files” Errors. (Even with ...
https://dev.mysql.com/doc/refman/5.7/en/user-names.html
You should never alter the structure of tables in the mysql database in any manner whatsoever except by means of the procedure that is described in Section 2.10, “Upgrading MySQL”. MySQL stores accounts in the user table of the mysql system ...
https://dev.mysql.com/doc/refman/5.7/en/group-replication-replication-group-member-stats.html
The performance_schema.replication_group_member_stats table provides group-level information related to the certification process, and also statistics for the transactions received and originated by each individual member of the replication group.
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-ndbinfo-disk-write-speed-aggregate-node.html
The disk_write_speed_aggregate_node table provides aggregated information per node about the speed of disk writes during LCP, backup, and restore operations.
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-ndbinfo-disk-write-speed-aggregate.html
The disk_write_speed_aggregate table provides aggregated information about the speed of disk writes during LCP, backup, and restore operations.
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-ndbinfo-disk-write-speed-base.html
The disk_write_speed_base table provides base information about the speed of disk writes during LCP, backup, and restore operations.