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https://dev.mysql.com/doc/refman/8.0/en/type-conversion.html
mysql> SELECT 38.8, CAST(38.8 AS CHAR); -> 38.8, '38.8' mysql> SELECT 38.8, CONCAT(38.8); -> 38.8, '38.8' See later in this section for information about the character set of implicit number-to-string conversions, and for modified rules that apply ... When an operator is used with operands of different types, type conversion occurs to make the operands ...
https://dev.mysql.com/doc/refman/8.0/en/column-indexes.html
Note Prefix limits are measured in bytes, whereas the prefix length in CREATE TABLE, ALTER TABLE, and CREATE INDEX statements is interpreted as number of characters for nonbinary string types (CHAR, VARCHAR, TEXT) and number of bytes for binary ...
https://dev.mysql.com/doc/refman/8.0/en/events-privileges.html
Since the user does not have the INSERT privilege for the table in question, the event has no effect. If you inspect the MySQL error log (hostname.err), you can see that the event is executing, but the action it is attempting to perform fails: ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-performance-optimizer-statistics.html
You can use the STATS_PERSISTENT, STATS_AUTO_RECALC, and STATS_SAMPLE_PAGES clauses with CREATE TABLE and ALTER TABLE statements to configure optimizer statistics for individual tables. You can manually modify the mysql.innodb_table_stats and ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-mgm-client-commands.html
Since there is currently no way using ndb_mgm or the mysql client to remove all data from a specific data node or node group, this means that the command succeeds only in the two following cases: After issuing CREATE NODEGROUP in the ndb_mgm client, ...TRUNCATE TABLE does not work for this purpose because this removes only the table data; the data nodes continue to store an NDBCLUSTER table's definition until a DROP TABLE statement is issued that causes the table metadata to be ...
https://dev.mysql.com/doc/refman/8.0/en/replication-rbr-safe-unsafe.html
Trigger or stored program updates a table having an AUTO_INCREMENT column. In addition, an INSERT into a table that has a composite primary key containing an AUTO_INCREMENT column that is not the first column of this composite key is unsafe. ON ...
https://dev.mysql.com/doc/refman/8.0/en/slow-query-log.html
Administrative statements include ALTER TABLE, ANALYZE TABLE, CHECK TABLE, CREATE INDEX, DROP INDEX, OPTIMIZE TABLE, and REPAIR TABLE. Note If you specify the TABLE log destination, see Log Tables and “Too many open files” Errors. (Even with ...
https://dev.mysql.com/doc/refman/8.0/en/binary-log.html
The binary log contains “events” that describe database changes such as table creation operations or changes to table data. You can use the --log-bin option to specify an alternative location, by adding a leading absolute path name to the base ...It also contains events for statements that potentially could have made changes (for example, a DELETE which matched no rows), unless row-based logging is ...
https://dev.mysql.com/doc/refman/8.0/en/function-optimization.html
If a function is tagged nondeterministic, a reference to it in a WHERE clause is evaluated for every row (when selecting from one table) or combination of rows (when selecting from a multiple-table join). MySQL also determines when to evaluate ...A ...
https://dev.mysql.com/doc/refman/8.0/en/ibd2sdi.html
ibd2sdi is a utility for extracting serialized dictionary information (SDI) from InnoDB tablespace files. ibd2sdi can be run on file-per-table tablespace files (*.ibd files), general tablespace files (*.ibd files), system tablespace files (ibdata* ...ibd2sdi can be used at runtime or while the server is ...