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https://dev.mysql.com/doc/refman/8.0/en/information-schema-user-attributes-table.html
The currently authenticated account has the UPDATE or SELECT privilege for the mysql.user system table. The USER_ATTRIBUTES table (available as of MySQL 8.0.21) provides information about user comments and user attributes. The USER_ATTRIBUTES table ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-autocommit-commit-rollback.html
If autocommit mode is enabled, each SQL statement forms a single transaction on its own. By default, MySQL starts the session for each new connection with autocommit enabled, so MySQL does a commit after each SQL statement if that statement did not ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-compression-tuning-monitoring.html
Based on the information in the INNODB_CMP and INNODB_CMP_PER_INDEX tables and overall application performance and hardware resource utilization, you might make changes in your hardware configuration, adjust the size of the buffer pool, choose a ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-create-table-external.html
mysql> SELECT @@innodb_file_per_table; +-------------------------+ | @@innodb_file_per_table | +-------------------------+ | 1 | +-------------------------+ For more information about file-per-table tablespaces, see Section 17.6.3.2, ... There are ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-information-schema-internal-data.html
Data retrieved from the lock tables exists when the SELECT is executed, but might be gone or changed by the time the query result is consumed by the client. Even if you issue a single SELECT (joining INNODB_TRX and PROCESSLIST, for example), the ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-memcached-internals.html
InnoDB API for the InnoDB memcached Plugin The InnoDB memcached engine accesses InnoDB through InnoDB APIs, most of which are directly adopted from embedded InnoDB. InnoDB API functions are passed to the InnoDB memcached engine as callback ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-memcached-multiple-get-range-query.html
The daemon_memcached plugin supports multiple get operations (fetching multiple key-value pairs in a single memcached query) and range queries. Multiple get Operations The ability to fetch multiple key-value pairs in a single memcached query ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-online-ddl-operations.html
mysql> SELECT NAME, TOTAL_ROW_VERSIONS FROM INFORMATION_SCHEMA.INNODB_TABLES WHERE NAME LIKE 'test/t1'; +---------+--------------------+ | NAME | TOTAL_ROW_VERSIONS | +---------+--------------------+ | test/t1 | 0 | +---------+--------------------+ ... Online support details, syntax examples, and usage notes for DDL operations are provided under the following topics in this ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-page-compression.html
InnoDB supports page-level compression for tables that reside in file-per-table tablespaces. Page compression is enabled by specifying the COMPRESSION attribute with CREATE TABLE or ALTER TABLE. Supported Platforms Page compression requires sparse ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-performance-schema.html
For example, to view information about instrumented InnoDB file objects seen by the Performance Schema when executing file I/O instrumentation, you might issue the following query: mysql> SELECT * FROM performance_schema.file_instances WHERE ...