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https://dev.mysql.com/doc/refman/8.0/en/slow-query-log.html
The slow query log consists of SQL statements that take more than long_query_time seconds to execute and require at least min_examined_row_limit rows to be examined. Note If you specify the TABLE log destination, see Log Tables and “Too many open ...The slow query log can be used to find queries that take a long time to execute and are therefore candidates for ...
https://dev.mysql.com/doc/refman/8.0/en/blackhole-storage-engine.html
The BLACKHOLE storage engine acts as a “black hole” that accepts data but throws it away and does not store it. Suppose that your application requires replica-side filtering rules, but transferring all binary log data to the replica first ...To ...
https://dev.mysql.com/doc/refman/8.0/en/entering-queries.html
mysql shows how many rows were returned and how long the query took to execute, which gives you a rough idea of server performance. (For brevity, the “rows in set” line is sometimes not shown in the remaining examples in this chapter.) Keywords ... Make sure that you are connected to the server, as discussed in the previous ...
https://dev.mysql.com/doc/refman/8.0/en/show-processlist.html
The SHOW PROCESSLIST statement is very useful if you get the “too many connections” error message and want to find out what is going on. row *************************** Id: 1 User: system user Host: db: NULL Command: Connect Time: 1030455 State: ... SHOW [FULL] PROCESSLIST Important The INFORMATION SCHEMA implementation of SHOW PROCESSLIST is deprecated and subject to removal in a future MySQL ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-replication-issues.html
In other words, the replication line (indicated by the curved arrows in the diagram) directly connects all SQL nodes used as sources and replicas. This type of circular replication scheme for NDB Cluster, in which the line of replication (again ...
https://dev.mysql.com/doc/refman/8.0/en/query-log.html
However, when using row-based binary logging, updates are sent as row changes rather than SQL statements, and thus these statements are never written to the query log when binlog_format is ROW. See Section 19.2.1.1, “Advantages and Disadvantages ... The general query log is a general record of what mysqld is ...
https://dev.mysql.com/doc/refman/8.0/en/group-by-handling.html
For example, if name is a primary key, its value determines the value of address because each group has only one value of the primary key and thus only one row. In particular, it is unlikely you would group on a single primary key column because ...
https://dev.mysql.com/doc/refman/8.0/en/keywords.html
At some point, you might upgrade to a higher version, so it is a good idea to have a look at future reserved words, too. Certain keywords, such as SELECT, DELETE, or BIGINT, are reserved and require special treatment for use as identifiers such as ...
https://dev.mysql.com/doc/refman/8.0/en/option-defaults-equals.html
Examining the last few lines of this file shows the reason: $> tail /usr/local/mysql/var/tonfisk.err 2013-09-24T15:36:22.278034Z 0 [ERROR] Too many arguments (first extra is 'my-errors'). mysql> SELECT USER(); +---------------+ | USER() | ...Due to ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-best-practices.html
While you don't want to commit too often, you also don't want to issue huge batches of INSERT, UPDATE, or DELETE statements that run for hours without committing. To get exclusive write access to a set of rows, use the SELECT ... FOR UPDATE syntax ...Specify a primary key for every table using the most frequently queried column or columns, or an auto-increment value if there is no obvious primary ...