PDF (US Ltr)
- 35.1Mb
PDF (A4)
- 35.2Mb
Man Pages (TGZ)
- 256.4Kb
Man Pages (Zip)
- 361.2Kb
Info (Gzip)
- 3.4Mb
Info (Zip)
- 3.4Mb
Search Results
https://dev.mysql.com/doc/refman/5.7/en/sys-schema-tables-with-full-table-scans.html
These views display which tables are being accessed with full table scans. The schema_tables_with_full_table_scans and x$schema_tables_with_full_table_scans views have these columns: object_schema The schema name. rows_full_scanned The total number ...
https://dev.mysql.com/doc/refman/5.7/en/getting-information.html
What if you forget the name of a database or table, or what the structure of a given table is (for example, what its columns are called)? MySQL addresses this problem through several statements that provide information about the databases and ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-best-practices.html
Specify a primary key for every table using the most frequently queried column or columns, or an auto-increment value if there is no obvious primary key. Use joins wherever data is pulled from multiple tables based on identical ID values from those ...Adding foreign keys ensures that referenced columns are indexed, which can improve ...
https://dev.mysql.com/doc/refman/5.7/en/optimizing-innodb-storage-layout.html
Once your data reaches a stable size, or a growing table has increased by tens or some hundreds of megabytes, consider using the OPTIMIZE TABLE statement to reorganize the table and compact any wasted space. The reorganized tables require less disk ...This is a straightforward technique that can improve performance when other techniques such as improving index usage or tuning application code are not ...
https://dev.mysql.com/doc/refman/5.7/en/commit.html
To disable autocommit mode implicitly for a single series of statements, use the START TRANSACTION statement: START TRANSACTION; SELECT @A:=SUM(salary) FROM table1 WHERE type=1; UPDATE table2 SET summary=@A WHERE type=1; COMMIT; With START ...SET ...
https://dev.mysql.com/doc/refman/5.7/en/timestamp-initialization.html
For any TIMESTAMP or DATETIME column in a table, you can assign the current timestamp as the default value, the auto-update value, or both: An auto-initialized column is set to the current timestamp for inserted rows that specify no value for the ...
https://dev.mysql.com/doc/refman/5.7/en/replication-options-gtids.html
Only statements that can be logged using GTID safe statements can be logged when enforce_gtid_consistency is set to ON, so the operations listed here cannot be used with this option: CREATE TABLE ... SELECT statements CREATE TEMPORARY TABLE or DROP ... The MySQL Server system variables described in this section are used to monitor and control Global Transaction Identifiers ...
https://dev.mysql.com/doc/refman/5.7/en/full-table.html
If a table-full error occurs, it may be that the disk is full or that the table has reached its maximum size. The effective maximum table size for MySQL databases is usually determined by operating system constraints on file sizes, not by MySQL ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-mysql-firewall-users-table.html
The MYSQL_FIREWALL_USERS table provides a view into the in-memory data cache for MySQL Enterprise Firewall. It is used in conjunction with the mysql.firewall_users system table that provides persistent storage of firewall data; see MySQL Enterprise ...It lists names and operational modes of registered firewall account ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-mysql-firewall-whitelist-table.html
The MYSQL_FIREWALL_WHITELIST table provides a view into the in-memory data cache for MySQL Enterprise Firewall. It is used in conjunction with the mysql.firewall_whitelist system table that provides persistent storage of firewall data; see MySQL ...