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https://dev.mysql.com/doc/refman/8.0/en/engine-condition-pushdown-optimization.html
This reduces the number of rows which must be handled by the SQL node during join processing. In this case, each row retrieved from the scan-filtered table is matched against every row in the buffer. This means that there is no single specific row ... This optimization improves the efficiency of direct comparisons between a nonindexed column and a ...
https://dev.mysql.com/doc/refman/8.0/en/faqs-triggers.html
Does MySQL have statement-level or row-level triggers? All triggers are FOR EACH ROW; that is, the trigger is activated for each row that is inserted, updated, or deleted. To affect trigger order, specify a clause after FOR EACH ROW that indicates ...Where can I find the documentation for MySQL 8.0 triggers? ...
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). The second query contains an expression that ...A function is nondeterministic if, given fixed values for its arguments, it can return different results for different ...
https://dev.mysql.com/doc/refman/8.0/en/insert-select.html
| TABLE table_name | VALUES row_constructor_list } [ON DUPLICATE KEY UPDATE assignment_list] value: {expr | DEFAULT} value_list: value [, value] ... row_constructor_list: ROW(value_list)[, ROW(value_list)][, ...] assignment: col_name = value | ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-error-summary-tables.html
row *************************** ERROR_NUMBER: 1064 ERROR_NAME: ER_PARSE_ERROR SQL_STATE: 42000 SUM_ERROR_RAISED: 1 SUM_ERROR_HANDLED: 0 FIRST_SEEN: 2016-06-28 07:34:02 LAST_SEEN: 2016-06-28 07:34:02 *************************** 2. row ... The ...
https://dev.mysql.com/doc/refman/8.0/en/precision-math-examples.html
This section provides some examples that show precision math query results in MySQL. These examples demonstrate the principles described in Section 14.24.3, “Expression Handling”, and Section 14.24.4, “Rounding Behavior”. Consider the ...
https://dev.mysql.com/doc/refman/8.0/en/delete-optimization.html
To delete rows more quickly, you can increase the size of the key cache by increasing the key_buffer_size system variable. The time required to delete individual rows in a MyISAM table is exactly proportional to the number of indexes. To delete all ...Truncate operations are not transaction-safe; an error occurs when attempting one in the course of an active transaction or active table ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-data-encryption.html
row *************************** SPACE: 4294967294 NAME: mysql SPACE_TYPE: General ENCRYPTION: Y *************************** 2. row *************************** SPACE: 2 NAME: test/t1 SPACE_TYPE: Single ENCRYPTION: Y *************************** 3. row ... InnoDB supports data-at-rest encryption for file-per-table tablespaces, general tablespaces, the mysql system tablespace, redo logs, and undo ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-memcached-replication.html
mysql> SELECT * FROM test.demo_test; +----+--------------+------+------+------+ | c1 | c2 | c3 | c4 | c5 | +----+--------------+------+------+------+ | AA | HELLO, HELLO | 8 | 0 | 0 | +----+--------------+------+------+------+ Remove all rows from ... Because the daemon_memcached plugin supports the MySQL binary log, source server through the memcached interface can be replicated for backup, balancing intensive read workloads, and high ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-disk-data-storage-requirements.html
For each row, this is equal to the space required to store the largest possible value for that column. Each row in a Disk Data table uses 8 bytes in memory to point to the data stored on disk. For example, converting a CHAR(4) column from ... The ...