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https://dev.mysql.com/doc/refman/8.0/en/information-schema-innodb-metrics-table.html
(The _RESET columns act like the lap counter on a stopwatch: you can measure the activity during some time interval, while the cumulative figures are still available in COUNT, MAX_COUNT, and so on.) MAX_COUNT_RESET The maximum counter value since it ...With more detailed queries, you can diagnose issues such as performance bottlenecks, resource shortages, and application ... The INNODB_METRICS table provides a ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-online-ddl-space-requirements.html
If the operation takes a long time and concurrent DML modifies the table so much that the size of the temporary log file exceeds the value of innodb_online_alter_log_max_size, the online DDL operation fails with a DB_ONLINE_LOG_TOO_BIG error, and ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-programs-ndb-error-reporter.html
The archive is named ndb_error_report_YYYYMMDDhhmmss.tar.bz2, where YYYYMMDDhhmmss is a datetime string. ndb_error_reporter also accepts the options listed here: --connection-timeout=timeout Command-Line Format --connection-timeout=# Type Integer ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-mutex-instances-table.html
The work performed while holding a mutex is said to be in a “critical section,” and multiple queries do execute this critical section in a serialized way (one at a time), which is a potential bottleneck. When a thread succeeds in locking a ...A ... The mutex_instances table lists all the mutexes seen by the Performance Schema while the server ...
https://dev.mysql.com/doc/refman/8.0/en/x-plugin-system-monitoring.html
Issue: mysql-py> \sql SELECT NAME, ENABLED, TIMED FROM performance_schema.setup_instruments WHERE NAME LIKE 'statement/%' AND NOT (ENABLED and TIMED) If this statement reports at least one row, you need to enable the instruments. When you execute a ... For general X Plugin monitoring, use the status variables that it ...
https://dev.mysql.com/doc/refman/8.0/en/constraint-enum.html
ENUM and SET columns provide an efficient way to define columns that can contain only a given set of values. See Section 13.3.5, “The ENUM Type”, and Section 13.3.6, “The SET Type”. For a column defined as ENUM('a','b','c'), values such as ...Unless strict mode is disabled (not recommended, but see Section 7.1.11, “Server SQL Modes”), the definition of a ENUM or SET column acts as a constraint on values entered into the ...
https://dev.mysql.com/doc/refman/8.0/en/data-masking-components.html
MySQL Enterprise Data Masking and De-Identification implements these elements: A table in the mysql system database for persistent storage of dictionaries and terms. A component named component_masking that implements masking functionality and ...
https://dev.mysql.com/doc/refman/8.0/en/drop-procedure.html
(If the automatic_sp_privileges system variable is enabled, that privilege and EXECUTE are granted automatically to the routine creator when the routine is created and dropped from the creator when the routine is dropped. See Section 27.2.2, ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-information-schema-innodb_cmp.html
The INNODB_CMP and INNODB_CMP_RESET tables provide status information about operations related to compressed tables, which are described in Section 17.9, “InnoDB Table and Page Compression”. These two tables have identical contents, but reading ...For example, if you archive the output of INNODB_CMP_RESET every 60 minutes, you see the statistics for each hourly ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-install-windows-source.html
The procedure for doing this is almost identical to the procedure used to compile the standard MySQL Server binaries for Windows, and uses the same tools. This means that, by default, if CMake cannot find the location of Java on your system, the ...