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https://dev.mysql.com/doc/refman/5.7/en/innodb-locking-reads.html
FOR UPDATE For index records the search encounters, locks the rows and any associated index entries, the same as if you issued an UPDATE statement for those rows. Your application code can ensure referential integrity throughout this sequence of ...
https://dev.mysql.com/doc/refman/5.7/en/faqs-replication.html
The implication of this is that, at any given time, the replica is not guaranteed to be in synchrony with the source unless you take some special measures. (This is why TIMESTAMP is well replicated.) In the Time column in the output of SHOW ... In ...
https://dev.mysql.com/doc/refman/5.7/en/data-directory-initialization.html
This section describes how to initialize the data directory manually for MySQL installation methods for which data directory initialization is not automatic. For example, you might see an error like this: bin/mysqld: error while loading shared ...
https://dev.mysql.com/doc/refman/5.7/en/multiple-key-caches.html
Use this for tables that are heavily used for searches but that are not updated. This feature enables you to assign different table indexes to different key caches. Any attempt to do this is ignored: mysql> SET GLOBAL key_buffer_size = 0; mysql> ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-indexes.html
For example, if you have a three-column index on (col1, col2, col3), you have indexed search capabilities on (col1), (col1, col2), and (col1, col2, col3). In this context, VARCHAR and CHAR are considered the same if they are declared as the same ...
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 ...