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https://dev.mysql.com/doc/refman/8.0/en/sys-innodb-buffer-stats-by-schema.html
These views summarize the information in the INFORMATION_SCHEMA INNODB_BUFFER_PAGE table, grouped by schema. Warning Querying views that access the INNODB_BUFFER_PAGE table can affect performance. The innodb_buffer_stats_by_schema and ...Do not ...
https://dev.mysql.com/doc/refman/8.0/en/sys-innodb-buffer-stats-by-table.html
These views summarize the information in the INFORMATION_SCHEMA INNODB_BUFFER_PAGE table, grouped by schema and table. Warning Querying views that access the INNODB_BUFFER_PAGE table can affect performance. The innodb_buffer_stats_by_table and ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-deadlocks-handling.html
It explains how to organize database operations to minimize deadlocks and the subsequent error handling required in applications. Deadlocks are a classic problem in transactional databases, but they are not dangerous unless they are so frequent that ... This section builds on the conceptual information about deadlocks in Section 17.7.5.2, “Deadlock ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-truncate-table-reclaim-space.html
To reclaim operating system disk space when truncating an InnoDB table, the table must be stored in its own .ibd file. For a table to be stored in its own .ibd file, innodb_file_per_table must enabled when the table is created. This is in contrast ...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 ...Additionally, there ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-online-ddl-limitations.html
Before an in-place online DDL operation can finish, it must wait for transactions that hold metadata locks on the table to commit or roll back. This is similar to the idea of a foreign key constraint check in InnoDB in which constraints must hold ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-innodb-ft-index-table-table.html
Before querying it, set the value of the innodb_ft_aux_table system variable to the name (including the database name) of the table that contains the FULLTEXT index (for example, test/articles). Before querying it, set the value of the ... The ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-innodb-virtual-table.html
The INNODB_VIRTUAL table provides metadata about InnoDB virtual generated columns and columns upon which virtual generated columns are based. CREATE TABLE `t1` ( `a` int(11) DEFAULT NULL, `b` int(11) DEFAULT NULL, `c` int(11) GENERATED ALWAYS AS ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-innodb-ft-config-table.html
The INNODB_FT_CONFIG table provides metadata about the FULLTEXT index and associated processing for an InnoDB table. Before querying it, set the value of the innodb_ft_aux_table system variable to the name (including the database name) of the table ...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/information-schema-innodb-ft-default-stopword-table.html
The INNODB_FT_DEFAULT_STOPWORD table holds a list of stopwords that are used by default when creating a FULLTEXT index on InnoDB tables. For information about the default InnoDB stopword list and how to define your own stopword lists, see Section ...For related usage information and examples, see Section 17.15.4, “InnoDB INFORMATION_SCHEMA FULLTEXT Index ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-innodb-temp-table-info-table.html
The INNODB_TEMP_TABLE_INFO table provides information about user-created InnoDB temporary tables that are active in an InnoDB instance. It does not provide information about internal InnoDB temporary tables used by the optimizer. The ...For usage ...row *************************** TABLE_ID: 97 NAME: #sql8c88_43_0 N_COLS: 4 SPACE: 76 Notes This table is useful primarily for expert-level ...