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https://dev.mysql.com/doc/refman/5.7/en/alter-database.html
Use UPGRADE DATA DIRECTORY NAME in this case to explicitly tell the server to re-encode the database directory name to the current encoding format: ALTER DATABASE `#mysql50#a-b-c` UPGRADE DATA DIRECTORY NAME; After executing this statement, you can ...ALTER {DATABASE | SCHEMA} db_name UPGRADE DATA DIRECTORY NAME alter_option: { [DEFAULT] CHARACTER SET [=] charset_name | [DEFAULT] COLLATE [=] collation_name } ALTER DATABASE enables you to change the overall characteristics of a ...
https://dev.mysql.com/doc/refman/5.7/en/cache-index.html
A key cache must exist before you assign indexes to it, or an error occurs: mysql> CACHE INDEX t1 IN non_existent_cache; ERROR 1284 (HY000): Unknown key cache 'non_existent_cache' By default, table indexes are assigned to the main (default) key ...| ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-innodb-cluster-introduction.html
An InnoDB Cluster usually runs in a single-primary mode, with one primary instance (read-write) and multiple secondary instances (read-only). This chapter introduces MySQL InnoDB Cluster, which combines MySQL technologies to enable you to deploy ...
https://dev.mysql.com/doc/refman/5.7/en/optimizing-innodb-bulk-data-loading.html
If you have UNIQUE constraints on secondary keys, you can speed up table imports by temporarily turning off the uniqueness checks during the import session: SET unique_checks=0; ... SET unique_checks=1; For big tables, this saves a lot of disk I/O ... These performance tips supplement the general guidelines for fast inserts in Section 8.2.4.1, “Optimizing INSERT ...
https://dev.mysql.com/doc/refman/5.7/en/arithmetic-functions.html
* Multiplication: mysql> SELECT 3*5; -> 15 mysql> SELECT 18014398509481984*18014398509481984.0; -> 324518553658426726783156020576256.0 mysql> SELECT 18014398509481984*18014398509481984; -> out-of-range error The last expression produces an error ...
https://dev.mysql.com/doc/refman/5.7/en/gis-class-multipolygon.html
A MultiPolygon is a MultiSurface object composed of Polygon elements. MultiPolygon Examples On a region map, a MultiPolygon could represent a system of lakes. MultiPolygon Assertions A MultiPolygon has no two Polygon elements with interiors that ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-deadlock-detection.html
Resolve these situations by setting the value of the innodb_lock_wait_timeout system variable. A wait-for list that exceeds 200 transactions is treated as a deadlock and the transaction attempting to check the wait-for list is rolled back. The same ... When deadlock detection is enabled (the default), InnoDB automatically detects transaction deadlocks and rolls back a transaction or transactions to break the ...
https://dev.mysql.com/doc/refman/5.7/en/purge-binary-logs.html
PURGE { BINARY | MASTER } LOGS { TO 'log_name' | BEFORE datetime_expr } The binary log is a set of files that contain information about data modifications made by the MySQL server. Examples: PURGE BINARY LOGS TO 'mysql-bin.010'; PURGE BINARY LOGS ...The log consists of a set of binary log files, plus an index file (see Section 5.4.4, “The Binary ...
https://dev.mysql.com/doc/refman/5.7/en/creating-accounts.html
As of MySQL 5.7.18, for any operation that modifies a grant table, the server checks whether the table has the expected structure and produces an error if not. These privileges enable the admin user to execute the mysqladmin reload, mysqladmin ...
https://dev.mysql.com/doc/refman/5.7/en/account-activity-auditing.html
Applications can use the following guidelines to perform SQL-based auditing that ties database activity to MySQL accounts. When a client connects successfully, the server authenticates the client to a particular row in this table. The User and Host ...