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/information-functions.html
This applies to statements such as UPDATE, INSERT, or DELETE (as before), but now also to statements such as ALTER TABLE and LOAD DATA. For example, BENCHMARK(10, (SELECT * FROM t)) fails if the table t has more than one column or more than one row.
https://dev.mysql.com/doc/refman/5.7/en/innodb-online-ddl-limitations.html
The ALTER TABLE clause LOCK=NONE is not permitted if there are ON...CASCADE or ON...SET NULL constraints on the table. When running an online DDL operation, the thread that runs the ALTER TABLE statement applies an online log of DML operations that ... The following limitations apply to online DDL operations: The table is copied when creating an index on a TEMPORARY ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-innodb-ft-deleted-table.html
The INNODB_FT_DELETED table stores rows that are deleted from the FULLTEXT index for an InnoDB table. Before querying it, set the value of the innodb_ft_aux_table system variable to the name (including the database name) of the table that contains ...For more information about InnoDB FULLTEXT search, see Section 14.6.2.4, “InnoDB Full-Text Indexes”, and Section 12.9, “Full-Text Search ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-innodb-sys-indexes-table.html
The INNODB_SYS_INDEXES table provides metadata about InnoDB indexes, equivalent to the information in the internal SYS_INDEXES table in the InnoDB data dictionary. For related usage information and examples, see Section 14.16.3, “InnoDB ...Index ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-innodb-sys-virtual-table.html
The INNODB_SYS_VIRTUAL table provides metadata about InnoDB virtual generated columns and columns upon which virtual generated columns are based, equivalent to information in the SYS_VIRTUAL table in the InnoDB data dictionary. A row appears in the ...The value is large because it encodes the column sequence number and ordinal ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-statement-tables.html
These tables store statement events: events_statements_current: The current statement event for each thread. prepared_statements_instances: Prepared statement instances and statistics The following sections describe the statement event tables. There ...Statement events occur at a high level of the event ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-table-characteristics.html
The name of the performance_schema database is lowercase, as are the names of tables within it. Many tables in the performance_schema database are read only and cannot be modified: mysql> TRUNCATE TABLE performance_schema.setup_instruments; ERROR ...Generally, the effect is to reset the summary columns to 0 or NULL, not to remove ...
https://dev.mysql.com/doc/refman/5.7/en/show-tables.html
SHOW [FULL] TABLES [{FROM | IN} db_name] [LIKE 'pattern' | WHERE expr] SHOW TABLES lists the non-TEMPORARY tables in a given database. The LIKE clause, if present, indicates which table names to match. Matching performed by the LIKE clause is ...
https://dev.mysql.com/doc/refman/5.7/en/faqs-cjk.html
Does MySQL permit CJK characters to be used in database and table names? A.11.18. You can obtain this information for a column column_name in the table table_name using the following query: SELECT HEX(column_name) FROM table_name; 3F is the encoding ... This set of Frequently Asked Questions derives from the experience of MySQL's Support and Development groups in handling many inquiries about CJK (Chinese-Japanese-Korean) ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-locking.html
Intention Locks InnoDB supports multiple granularity locking which permits coexistence of row locks and table locks. WRITE takes an exclusive lock (an X lock) on the specified table. Intention locks are table-level locks that indicate which type of ...Shared and Exclusive Locks Intention Locks Record Locks Gap Locks Next-Key Locks Insert Intention Locks AUTO-INC Locks Predicate Locks for Spatial Indexes Shared and Exclusive Locks InnoDB implements standard row-level locking where there are two types of locks, shared (S) locks and exclusive (X) ...