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https://dev.mysql.com/doc/refman/8.0/en/performance-schema-setup-instruments-table.html
The setup_instruments table lists classes of instrumented objects for which events can be collected: mysql> SELECT * FROM performance_schema.setup_instruments\G *************************** 1. row *************************** NAME: ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-stage-tables.html
The Performance Schema instruments stages, which are steps during the statement-execution process, such as parsing a statement, opening a table, or performing a filesort operation. Stages correspond to the thread states displayed by SHOW ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-statement-histogram-summary-tables.html
The Performance Schema maintains statement event summary tables that contain information about minimum, maximum, and average statement latency (see Section 29.12.20.3, “Statement Summary Tables”). To permit assessment at a more fine-grained ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-statement-summary-tables.html
For MySQL Community Edition Server, MySQL Enterprise Edition Server (on-premise), and MySQL HeatWave Service without MySQL HeatWave, queries are always processed on the PRIMARY engine, which means the value is always 0 on these MySQL Servers. The ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-threads-table.html
The threads table contains a row for each server thread. Each row contains information about a thread and indicates whether monitoring and historical event logging are enabled for it: mysql> SELECT * FROM performance_schema.threads\G ...
https://dev.mysql.com/doc/refman/8.0/en/point-in-time-recovery-positions.html
The last section, Section 9.5.1, “Point-in-Time Recovery Using Binary Log”, explains the general idea of using the binary log to perform a point-in-time-recovery. As an example, suppose that around 20:06:00 on March 11, 2020, an SQL statement ...
https://dev.mysql.com/doc/refman/8.0/en/populating-spatial-columns.html
After you have created spatial columns, you can populate them with spatial data. Values should be stored in internal geometry format, but you can convert them to that format from either Well-Known Text (WKT) or Well-Known Binary (WKB) format. For ...
https://dev.mysql.com/doc/refman/8.0/en/precision-math-rounding.html
This section discusses precision math rounding for the ROUND() function and for inserts into columns with exact-value types (DECIMAL and integer). The ROUND() function rounds differently depending on whether its argument is exact or approximate: ...
https://dev.mysql.com/doc/refman/8.0/en/privilege-checking.html
In complex scenarios where the query uses SQL SECURITY DEFINER views or stored routines, it may be that a user is denied from seeing the trace of its query because it lacks some extra privileges on those objects. In that case, the trace will be ...
https://dev.mysql.com/doc/refman/8.0/en/problems-connecting.html
If you encounter problems when you try to connect to the MySQL server, the following items describe some courses of action you can take to correct the problem. To correct this when you invoke a client program, specify a --port option to indicate ...