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https://dev.mysql.com/doc/refman/5.7/en/performance-schema-pre-filtering.html
Pre-filtering can be applied to either the producer or consumer stage of event processing: To configure pre-filtering at the producer stage, several tables can be used: setup_instruments indicates which instruments are available. An instrument ...
https://dev.mysql.com/doc/refman/5.7/en/forcing-innodb-recovery.html
If you encounter a runaway rollback caused by a failing mass import or ALTER TABLE, you can kill the mysqld process and set innodb_force_recovery to 3 to bring the database up without the rollback, and then DROP the table that is causing the runaway ... To investigate database page corruption, you might dump your tables from the database with SELECT ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-consistent-read.html
Consistent read does not work over ALTER TABLE operations that make a temporary copy of the original table and delete the original table when the temporary copy is built. This exception causes the following anomaly: If you update some rows in a ...
https://dev.mysql.com/doc/refman/5.7/en/myisam-start.html
myisam_max_sort_file_size The maximum size of the temporary file that MySQL is permitted to use while re-creating a MyISAM index (during REPAIR TABLE, ALTER TABLE, or LOAD DATA). The following options to mysqld can be used to change the behavior of ...bulk_insert_buffer_size The size of the tree cache used in bulk insert ...
https://dev.mysql.com/doc/refman/5.7/en/string-type-syntax.html
In some cases, MySQL may change a string column to a type different from that given in a CREATE TABLE or ALTER TABLE statement. See Section 8.4.7, “Limits on Table Column Count and Row Size”. (The practical limit is less than 3000.) A table can ... The string data types are CHAR, VARCHAR, BINARY, VARBINARY, BLOB, TEXT, ENUM, and ...
https://dev.mysql.com/doc/refman/5.7/en/ansi-diff-select-into-table.html
For example: INSERT INTO tbl_temp2 (fld_id) SELECT tbl_temp1.fld_order_id FROM tbl_temp1 WHERE tbl_temp1.fld_order_id > 100; Alternatively, you can use SELECT ... The same syntax can also be used inside stored routines using cursors and local ...
https://dev.mysql.com/doc/refman/5.7/en/firewall-information-schema-tables.html
The following sections describe the INFORMATION_SCHEMA tables associated with MySQL Enterprise Firewall (see Section 6.4.6, “MySQL Enterprise Firewall”). These tables are available only if the appropriate firewall plugins are enabled.
https://dev.mysql.com/doc/refman/5.7/en/general-information-schema-tables.html
The following sections describe what may be denoted as the “general” set of INFORMATION_SCHEMA tables. These are the tables not associated with particular storage engines, components, or plugins.
https://dev.mysql.com/doc/refman/5.7/en/information-schema-character-sets-table.html
The CHARACTER_SETS table has these columns: CHARACTER_SET_NAME The character set name. MAXLEN The maximum number of bytes required to store one character. Notes Character set information is also available from the SHOW CHARACTER SET statement. The ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-collation-character-set-applicability-table.html
The COLLATION_CHARACTER_SET_APPLICABILITY table indicates what character set is applicable for what collation. CHARACTER_SET_NAME The name of the character set with which the collation is associated. Notes The COLLATION_CHARACTER_SET_APPLICABILITY ...