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https://dev.mysql.com/doc/refman/5.7/en/sys-ps-thread-account.html
Given a Performance Schema thread ID, returns the user_name@host_name account associated with the thread. Parameters in_thread_id BIGINT UNSIGNED: The thread ID for which to return the account. The value should match the THREAD_ID column from some ...Example mysql> SELECT sys.ps_thread_account(sys.ps_thread_id(CONNECTION_ID())); +----------------------------------------------------------+ | sys.ps_thread_account(sys.ps_thread_id(CONNECTION_ID())) | +----------------------------------------------------------+ | root@localhost | ...
https://dev.mysql.com/doc/refman/5.7/en/sys-quote-identifier.html
Given a string argument, this function produces a quoted identifier suitable for inclusion in SQL statements. This is useful when a value to be used as an identifier is a reserved word or contains backtick (`) characters. Example mysql> SELECT ...
https://dev.mysql.com/doc/refman/5.7/en/sys-schema-object-overview.html
Note For MySQL instances with a large number of objects, this view might take a long time to execute. This view summarizes the types of objects within each schema. object_type The object type: BASE TABLE, INDEX (index_type), EVENT, FUNCTION, ...
https://dev.mysql.com/doc/refman/5.7/en/sys-schema-redundant-indexes.html
The schema_redundant_indexes view displays indexes that duplicate other indexes or are made redundant by them. In the following column descriptions, the dominant index is the one that makes the redundant index redundant. The ...
https://dev.mysql.com/doc/refman/5.7/en/sys-schema-reference.html
The sys schema includes tables and triggers, views, and stored procedures and functions.
https://dev.mysql.com/doc/refman/5.7/en/sys-schema-unused-indexes.html
These views display indexes for which there are no events, which indicates that they are not being used. This view is most useful when the server has been up and processing long enough that its workload is representative. Otherwise, presence of an ...
https://dev.mysql.com/doc/refman/5.7/en/sys-version.html
For example, use the VERSION() function to retrieve the MySQL server version. This view provides the current sys schema and MySQL server versions. Note As of MySQL 5.7.28, this view is deprecated and subject to removal in a future MySQL version.
https://dev.mysql.com/doc/refman/5.7/en/thread-pool-information-schema-tables.html
The following sections describe the INFORMATION_SCHEMA tables associated with the thread pool plugin (see Section 5.5.3, “MySQL Enterprise Thread Pool”). They provide information about thread pool operation: TP_THREAD_GROUP_STATE: Information ...Thus, the MySQL server holds the mutex of the thread group while producing the ...
https://dev.mysql.com/doc/refman/5.7/en/update-optimization.html
Performing multiple updates together is much quicker than doing one at a time if you lock the table. For a MyISAM table that uses dynamic row format, updating a row to a longer total length may split the row. An update statement is optimized like a ...
https://dev.mysql.com/doc/refman/5.7/en/verifying-package-integrity.html
After downloading the MySQL package that suits your needs and before attempting to install it, make sure that it is intact and has not been tampered with. There are three means of integrity checking: MD5 checksums Cryptographic signatures using ...
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