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https://dev.mysql.com/doc/refman/8.0/en/diagnostics-area.html
Diagnostics Area Structure Diagnostics Area Information Items How the Diagnostics Area is Cleared and Populated How the Diagnostics Area Stack Works Diagnostics Area-Related System Variables Diagnostics Area Structure The diagnostics area contains ... SQL statements produce diagnostic information that populates the diagnostics ...
https://dev.mysql.com/doc/refman/8.0/en/string-functions.html
mysql> SELECT CHAR(77,121,83,81,'76'); +--------------------------------------------------+ | CHAR(77,121,83,81,'76') | +--------------------------------------------------+ | 0x4D7953514C | +--------------------------------------------------+ 1 row ...For functions that operate on string positions, the first position is numbered ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-events-transactions-current-table.html
The table stores one row per thread showing the current status of the thread's most recent monitored transaction event, so there is no system variable for configuring the table size. Other tables that contain transaction event rows are logically ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-metadata-locks-table.html
It is autosized by default; to configure the table size, set the performance_schema_max_metadata_locks system variable at server startup. When a metadata lock is requested and not obtained immediately, a row with a status of PENDING is inserted.
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-added-deprecated-removed.html
BatchSizePerLocalScan: Used to calculate number of lock records for scan with hold lock. Ndb_api_read_row_count_replica: Total number of rows that have been read by this replica. Ndb_api_trans_local_read_row_count_replica: Total number of rows that ...Parameters Introduced in NDB 8.0 The following node configuration parameters have been added in NDB ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-events-stages-current-table.html
The table stores one row per thread showing the current status of the thread's most recent monitored stage event, so there is no system variable for configuring the table size. Of the tables that contain stage event rows, events_stages_current is ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-stage-tables.html
The Performance Schema tables provide a container to store progress data, but make no assumptions about the semantics of the metric itself: A “work unit” is an integer metric that increases over time during execution, such as the number of ...
https://dev.mysql.com/doc/refman/8.0/en/known-issues.html
DELETE if you are deleting rows from a table that has foreign keys with ON DELETE CASCADE properties. SELECT with no ORDER BY, the SELECT may return rows in a different order (which results in a row having different ranks, hence getting a different ... This section lists known issues in recent versions of ...
https://dev.mysql.com/doc/refman/8.0/en/merge-table-problems.html
Instead, the rows from the underlying MyISAM tables are copied into the altered table, which then uses the specified storage engine. However, use of the AUTO_INCREMENT table option for that MyISAM table has no effect for inserts into the MERGE table ... The following are known problems with MERGE tables: MERGE child tables are locked through the parent ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-information-schema-fulltext_index-tables.html
INNODB_FT_DELETED: Stores rows that are deleted from the FULLTEXT index for an InnoDB table. INNODB_FT_INDEX_CACHE: Provides token information about newly inserted rows in a FULLTEXT index. mysql> SET GLOBAL innodb_ft_aux_table = 'test/articles'; ...