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https://dev.mysql.com/doc/refman/8.0/en/performance-schema-prepared-statements-instances-table.html
Instrument Server Command statement/com/Prepare COM_STMT_PREPARE statement/com/Execute COM_STMT_EXECUTE statement/sql/prepare_sql SQLCOM_PREPARE statement/sql/execute_sql SQLCOM_EXECUTE The Performance Schema manages the contents of the ...This is ... The Performance Schema provides instrumentation for prepared statements, for which there are two protocols: The binary ...
https://dev.mysql.com/doc/refman/8.0/en/partitioning-limitations-partitioning-keys-unique-keys.html
The rule governing this relationship can be expressed as follows: All columns used in the partitioning expression for a partitioned table must be part of every unique key that the table may have. In other words, every unique key on the table must ...
https://dev.mysql.com/doc/refman/8.0/en/column-count-limit.html
Functional key parts (see Section 15.1.15, “CREATE INDEX Statement”) are implemented as hidden virtual generated stored columns, so each functional key part in a table index counts against the table total column limit. mysql> CREATE TABLE t (a ... This section describes limits on the number of columns in tables and the size of individual ...The storage ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-wait-summary-tables.html
If an instrument is used to create multiple instances, each instance has a unique OBJECT_INSTANCE_BEGIN value and is summarized separately in this table. The Performance Schema maintains tables for collecting current and recent wait events, and ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-innodb-buffer-page-table.html
The INNODB_BUFFER_PAGE table provides information about each page in the InnoDB buffer pool. For related usage information and examples, see Section 17.15.5, “InnoDB INFORMATION_SCHEMA Buffer Pool Tables”. Do not query this table on a ...To ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-status-variable-tables.html
Status variable information is available in these Performance Schema tables: global_status: Global status variables. An application that wants only global values should use this table. An application that wants all status variable values for its own ... The MySQL server maintains many status variables that provide information about its operation (see Section 7.1.10, “Server Status ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-truncate-table-reclaim-space.html
For a table to be stored in its own .ibd file, innodb_file_per_table must enabled when the table is created. When a table is truncated, it is dropped and re-created in a new .ibd file, and the freed space is returned to the operating system. This is ... To reclaim operating system disk space when truncating an InnoDB table, the table must be stored in its own .ibd ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-innodb-ft-config-table.html
use_stopword: Indicates whether a stopword table is used, which is defined when the FULLTEXT index is created. The INNODB_FT_CONFIG table provides metadata about the FULLTEXT index and associated processing for an InnoDB table. Before querying it, ...The values for this column might change, depending on the needs for performance tuning and debugging for InnoDB full-text ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-compression-internals.html
If innodb_strict_mode is ON, MySQL checks the maximum row size during CREATE TABLE or CREATE INDEX. If you create a table when innodb_strict_mode is OFF, and a subsequent INSERT or UPDATE statement attempts to create an index entry that does not fit ... This section describes some internal implementation details about compression for InnoDB ...The information presented here may ...
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 ...