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https://dev.mysql.com/doc/refman/8.0/en/sys-format-time.html
Depending on the size of the value, the units part is ps (picoseconds), ns (nanoseconds), us (microseconds), ms (milliseconds), s (seconds), m (minutes), h (hours), d (days), or w (weeks). Note As of MySQL 8.0.16, format_time() is deprecated and ...
https://dev.mysql.com/doc/refman/8.0/en/sys-schema-views.html
The view with the x$ prefix that displays the same values in raw form is intended more for use with other tools that perform their own processing on the data. Views without the x$ prefix differ from the corresponding x$ views in these ways: Byte ...
https://dev.mysql.com/doc/refman/8.0/en/validate-password-options-variables.html
This section describes the system and status variables that validate_password provides to enable its operation to be configured and monitored. This applies only when changing an existing password, and has no effect when setting a user account's ...
https://dev.mysql.com/doc/refman/8.0/en/windows-server-first-start.html
To start the server, enter this command: C:\> "C:\Program Files\MySQL\MySQL Server 8.0\bin\mysqld" --console You should see messages similar to those following as it starts (the path names and sizes may differ). This section gives a general ...
https://dev.mysql.com/doc/refman/8.0/en/create-view.html
The WITH CHECK OPTION clause can be given to constrain inserts or updates to rows in tables referenced by the view. For a view to be updatable, there must be a one-to-one relationship between the rows in the view and the rows in the underlying table. The WITH CHECK OPTION clause can be given for an updatable view to prevent inserts or updates to rows except those for which the WHERE clause in the select_statement is ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-requirements.html
Such keys are required as a unique identifier for every row within a table, enabling the system to determine which transactions conflict by identifying exactly which rows each transaction has modified. Group Replication relies on the row-based ...
https://dev.mysql.com/doc/refman/8.0/en/index-extensions.html
row *************************** id: 1 select_type: SIMPLE table: t1 type: ref possible_keys: PRIMARY,k_d key: k_d key_len: 4 ref: const rows: 5 Extra: Using where; Using index When the optimizer takes index extensions into account, it treats k_d as ... InnoDB automatically extends each secondary index by appending the primary key columns to ...
https://dev.mysql.com/doc/refman/8.0/en/index-hints.html
The USE INDEX (index_list) hint tells MySQL to use only one of the named indexes to find rows in the table. In other words, a table scan is used only if there is no way to use one of the named indexes to find rows in the table. To affect only the ...
https://dev.mysql.com/doc/refman/8.0/en/index-merge-optimization.html
The Index Merge access method retrieves rows with multiple range scans and merges their results into one. If all columns used in the query are covered by the used indexes, full table rows are not retrieved (EXPLAIN output contains Using index in ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-information-schema-understanding-innodb-locking.html
When a transaction updates a row in a table, or locks it with SELECT FOR UPDATE, InnoDB establishes a list or queue of locks on that row. If a second transaction wants to update a row or lock a table already locked by a prior transaction in an ...