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https://dev.mysql.com/doc/refman/8.0/en/mrr-optimization.html
Reading rows using a range scan on a secondary index can result in many random disk accesses to the base table when the table is large and not stored in the storage engine's cache. With the Disk-Sweep Multi-Range Read (MRR) optimization, MySQL ...
https://dev.mysql.com/doc/refman/8.0/en/multiple-unix-servers.html
It is also possible to use the same server binary and start each invocation of it with different parameter values at runtime. For MySQL installation using an RPM distribution, server startup and shutdown is managed by systemd on several Linux ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-install-linux-source.html
This section provides information about compiling NDB Cluster on Linux and other Unix-like platforms. Building NDB Cluster from source is similar to building the standard MySQL Server, although it differs in a few key respects discussed here. For ...For general information about building MySQL from source, see Section 2.8, “Installing MySQL from ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-gr-memory-monitoring-ps-sample-queries.html
This section describes sample queries using the instruments and events for monitoring Group Replication memory usage. row *************************** EVENT_NAME: memory/group_rpl/memory_gr SUM(COUNT_ALLOC): 127 SUM(COUNT_FREE): 117 ...The memory ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-status-variable-tables.html
There are also summary tables that provide status variable information aggregated by account, host name, and user name. To obtain global and per-session statement execution counts, use the events_statements_summary_global_by_event_name and ... The ...
https://dev.mysql.com/doc/refman/8.0/en/row-subqueries.html
A row subquery is a subquery variant that returns a single row and can thus return more than one column value. If this row has col3 and col4 values equal to the col1 and col2 values of any rows in t1, the WHERE expression is TRUE and each query ...
https://dev.mysql.com/doc/refman/8.0/en/spatial-convenience-functions.html
For example, this polygon is geometrically invalid: POLYGON((0 0, 0 0, 0 0, 0 0, 0 0)) ST_Validate() returns the geometry if it is syntactically well-formed and is geometrically valid, NULL if the argument is not syntactically well-formed or is not ...Unless otherwise specified, functions in this section handle their geometry arguments as follows: If any argument is NULL, the return value is ...
https://dev.mysql.com/doc/refman/8.0/en/table.html
TABLE is a DML statement introduced in MySQL 8.0.19 which returns rows and columns of the named table. Given the existence of a table named t, the following two statements produce identical output: TABLE t; SELECT * FROM t; You can order and limit ...TABLE does not allow for any arbitrary filtering of rows; that is, TABLE does not support any WHERE ...
https://dev.mysql.com/doc/refman/8.0/en/uln-installation.html
You can find information about Oracle Linux and ULN under http://linux.oracle.com/. To use ULN, you need to obtain a ULN login and register the machine used for installation with ULN. Both Community and Commercial packages are supported, and each ...
https://dev.mysql.com/doc/refman/8.0/en/workbench.html
MySQL Workbench provides a graphical tool for working with MySQL servers and databases. MySQL Workbench may connect to MySQL Server 8.4 and higher but some MySQL Workbench features may not function with those newer server versions. MySQL Workbench ...For more information, see the MySQL Workbench manual, available at ...