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https://dev.mysql.com/doc/refman/5.7/en/innodb-file-space.html
Whether the freed space becomes available for other users depends on whether the pattern of deletes frees individual pages or extents to the tablespace. Dropping a table or deleting all rows from it is guaranteed to release the space to other users, ... The data files that you define in the configuration file using the innodb_data_file_path configuration option form the InnoDB system ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-timing.html
For example, on Pentiums, the instruction is RDTSC (an assembly-language rather than a C instruction) and it is theoretically possible for the operating system to prevent user-mode programs from using it. Each timer row in setup_timers must refer to ...Instruments time events, which is how the Performance Schema provides an idea of how long events ...
https://dev.mysql.com/doc/refman/5.7/en/windows-start-command-line.html
You can stop the MySQL server by executing this command: C:\> "C:\Program Files\MySQL\MySQL Server 5.7\bin\mysqladmin" -u root shutdown Note If the MySQL root user account has a password, you need to invoke mysqladmin with the -p option and supply ...The command connects as the MySQL root user, which is the default administrative account in the MySQL grant ...Alternatively, you can try to start the server with the ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-install-linux-rpm.html
The RPM installer should take care of general configuration issues (such as creating the mysql user and group, if needed) automatically. This section covers the steps necessary to install the correct executables for each type of NDB Cluster node ...
https://dev.mysql.com/doc/refman/5.7/en/linux-installation-debian.html
Users who want to set a password later can leave the password field blank in the dialogue box and just press OK; in that case, root access to the server is authenticated using the MySQL Socket Peer-Credential Authentication Plugin for connections ...
https://dev.mysql.com/doc/refman/5.7/en/index-page-merge-threshold.html
When the “page-full” percentage for an index page falls below 50%, which is the default MERGE_THRESHOLD setting, InnoDB attempts to merge the index page with a neighboring page. Setting MERGE_THRESHOLD for a Table You can set the MERGE_THRESHOLD ...If the “page-full” percentage for an index page falls below the MERGE_THRESHOLD value when a row is deleted or when a row is shortened by an UPDATE operation, InnoDB attempts to merge the index page with a neighboring index ...
https://dev.mysql.com/doc/refman/5.7/en/myisamchk-table-info.html
If you start the MySQL server with external locking disabled, myisamchk may report an error for a table that is updated while it runs. myisamchk -dv tbl_name Adding -v runs myisamchk in verbose mode so that it produces more information about the ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-optimization.html
Applications that monitor databases may make frequent use of INFORMATION_SCHEMA tables. Note Comparison behavior for database and table names in INFORMATION_SCHEMA queries might differ from what you expect. 1) Try to use constant lookup values for ...Certain types of queries for INFORMATION_SCHEMA tables can be optimized to execute more ...The ENGINE (storage engine) value can be determined by ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-standard-monitor.html
The Lock Monitor is the same as the Standard Monitor except that it includes additional lock information. Enabling either monitor for periodic output turns on the same output stream, but the stream includes extra information if the Lock Monitor is ...Standard Monitor output is limited to 1MB when produced using the SHOW ENGINE INNODB STATUS ...
https://dev.mysql.com/doc/refman/5.7/en/show-table-status.html
SHOW TABLE STATUS [{FROM | IN} db_name] [LIKE 'pattern' | WHERE expr] SHOW TABLE STATUS works likes SHOW TABLES, but provides a lot of information about each non-TEMPORARY table. For partitioned tables, Engine shows the name of the storage engine ...You can also get this list using the mysqlshow --status db_name ...