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Search Results
https://dev.mysql.com/doc/refman/5.7/en/is-null-optimization.html
For example, MySQL can use indexes and ranges to search for NULL with IS NULL. This optimization does not occur in cases when the column might produce NULL anyway (for example, if it comes from a table on the right side of a LEFT JOIN). This ...
https://dev.mysql.com/doc/refman/5.7/en/monitor-innodb-mutex-waits-performance-schema.html
For example, to disable InnoDB mutex wait event instruments related to full-text search, add the following rule: performance-schema-instrument='wait/synch/mutex/innodb/fts%=OFF' Note Rules with a longer prefix such as wait/synch/mutex/innodb/fts% ...
https://dev.mysql.com/doc/refman/5.7/en/audit-log-legacy-filtering.html
Note This section describes legacy audit log filtering, which applies under either of these circumstances: Before MySQL 5.7.13, that is, prior to the introduction of rule-based audit log filtering described in Section 6.4.5.7, “Audit Log ...As of ...
https://dev.mysql.com/doc/refman/5.7/en/create-trigger.html
CREATE [DEFINER = user] TRIGGER trigger_name trigger_time trigger_event ON tbl_name FOR EACH ROW [trigger_order] trigger_body trigger_time: { BEFORE | AFTER } trigger_event: { INSERT | UPDATE | DELETE } trigger_order: { FOLLOWS | PRECEDES } ...A ...
https://dev.mysql.com/doc/refman/5.7/en/docker-mysql-more-topics.html
MYSQL_RANDOM_ROOT_PASSWORD: When this variable is true (which is its default state, unless MYSQL_ROOT_PASSWORD is set or MYSQL_ALLOW_EMPTY_PASSWORD is set to true), a random password for the server's root user is generated when the Docker container ...A MySQL Docker installation is different from a common, non-Docker installation in the following aspects: Included binaries are limited to: /usr/bin/my_print_defaults /usr/bin/mysql /usr/bin/mysql_config /usr/bin/mysql_install_db /usr/bin/mysql_tzinfo_to_sql /usr/bin/mysql_upgrade /usr/bin/mysqladmin /usr/bin/mysqlcheck /usr/bin/mysqldump /usr/bin/mysqlpump /usr/sbin/mysqld All binaries are stripped; they contain no debug ...
https://dev.mysql.com/doc/refman/5.7/en/enum.html
This means that you can use the following SELECT statement to find rows into which invalid ENUM values were assigned: mysql> SELECT * FROM tbl_name WHERE enum_col=0; The index of the NULL value is NULL. For example, you can retrieve numeric values ... An ENUM is a string object with a value chosen from a list of permitted values that are enumerated explicitly in the column specification at table creation ...
https://dev.mysql.com/doc/refman/5.7/en/index-statistics.html
This affects ref accesses for comparisons of the form tbl_name.key = expr: MySQL does not access the table if the current value of expr is NULL, because the comparison cannot be true. If the NULL value group size is much higher than the average ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-innodb-sys-tablespaces-table.html
The data in this field is interpreted from the tablespace flags information that resides in the .ibd file. The data in this column is interpreted from the tablespace flags information that resides in the .ibd file. The data in this column is ... The ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-information-schema-system-tables.html
This information comes from the InnoDB internal system tables (also referred to as the InnoDB data dictionary), which cannot be queried directly like regular InnoDB tables. Traditionally, you would get this type of information using the techniques ... You can extract metadata about schema objects managed by InnoDB using InnoDB INFORMATION_SCHEMA system ...
https://dev.mysql.com/doc/refman/5.7/en/monitor-alter-table-performance-schema.html
In order of occurrence, ALTER TABLE stage events include: stage/innodb/alter table (read PK and internal sort): This stage is active when ALTER TABLE is in the reading-primary-key phase. stage/innodb/alter table (merge sort): This stage is repeated ... You can monitor ALTER TABLE progress for InnoDB tables using Performance ...