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https://dev.mysql.com/doc/refman/8.0/en/json.html
Along with the JSON data type, a set of SQL functions is available to enable operations on JSON values, such as creation, manipulation, and searching. JSON columns, like columns of other binary types, are not indexed directly; instead, you can ...
https://dev.mysql.com/doc/refman/8.0/en/engine-condition-pushdown-optimization.html
An example of such a query, using the table t1 created previously, is shown here: mysql> EXPLAIN -> SELECT * FROM t1 AS x -> LEFT JOIN t1 AS y -> ON x.a=0 AND y.b>=3\G *************************** 1. Joins are not directly supported; conditions ...
https://dev.mysql.com/doc/refman/8.0/en/compressed-format.html
Compressed tables have the following characteristics: Compressed tables take very little disk space. The header for a row takes up one to three bytes depending on the biggest row in the table. Note While a compressed table is read only, and you ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-programs-ndb-delete-all.html
In some cases, this can be much faster than DELETE or even TRUNCATE TABLE. Usage ndb_delete_all -c connection_string tbl_name -d db_name This deletes all rows from the table named tbl_name in the database named db_name. Options that can be used with ...--connect-retries Command-Line Format --connect-retries=# Type Integer Default Value 12 Minimum Value 0 Maximum Value 12 Number of times to retry connection before giving ...
https://dev.mysql.com/doc/refman/8.0/en/faqs-cjk.html
Why do I get Incorrect string value error messages? To see the problem, create a table with one Unicode (ucs2) column and one Chinese (gb2312) column. mysql> CREATE TABLE ch (ucs2 CHAR(3) CHARACTER SET ucs2, gb2312 CHAR(3) CHARACTER SET gb2312); In ...Does MySQL permit CJK characters to be used in database and table names? ... This set of Frequently Asked Questions derives from the experience of MySQL's Support and ...
https://dev.mysql.com/doc/refman/8.0/en/partitioning-hash.html
To partition a table using HASH partitioning, it is necessary to append to the CREATE TABLE statement a PARTITION BY HASH (expr) clause, where expr is an expression that returns an integer. In addition, you most likely want to follow this with ...
https://dev.mysql.com/doc/refman/8.0/en/silent-column-changes.html
In some cases, MySQL silently changes column specifications from those given in a CREATE TABLE or ALTER TABLE statement. Trailing spaces are automatically deleted from ENUM and SET member values when the table is created. See Section 10.4.7, ...
https://dev.mysql.com/doc/refman/8.0/en/index-hints.html
They also work with multi-table DELETE statements, but not with single-table DELETE, as shown later in this section. (For the general syntax for specifying tables in a SELECT statement, see Section 15.2.13.2, “JOIN Clause”.) The syntax for ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-information-schema-internal-data.html
Note This section describes locking information as exposed by the Performance Schema data_locks and data_lock_waits tables, which supersede the INFORMATION_SCHEMA INNODB_LOCKS and INNODB_LOCK_WAITS tables in MySQL 8.0. For similar discussion ...
https://dev.mysql.com/doc/refman/8.0/en/load-index.html
| ALL } The LOAD INDEX INTO CACHE statement preloads a table index into the key cache to which it has been assigned by an explicit CACHE INDEX statement, or into the default key cache otherwise. LOAD INDEX INTO CACHE applies only to MyISAM tables, ...tbl_index_list: tbl_name [PARTITION (partition_list)] [{INDEX|KEY} (index_name[, index_name] ...)] [IGNORE LEAVES] partition_list: { partition_name[, partition_name] ...