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https://dev.mysql.com/doc/refman/8.0/en/innodb-locking.html
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 ...
https://dev.mysql.com/doc/refman/8.0/en/show-columns.html
These two statements are equivalent: SHOW COLUMNS FROM mytable FROM mydb; SHOW COLUMNS FROM mydb.mytable; The optional EXTENDED keyword causes the output to include information about hidden columns that MySQL uses internally and are not accessible ... SHOW [EXTENDED] [FULL] {COLUMNS | FIELDS} {FROM | IN} tbl_name [{FROM | IN} db_name] [LIKE 'pattern' | WHERE expr] SHOW COLUMNS displays information about the columns in a given ...
https://dev.mysql.com/doc/refman/8.0/en/partitioning-selection.html
Partition selection is similar to partition pruning, in that only specific partitions are checked for matches, but differs in two key respects: The partitions to be checked are specified by the issuer of the statement, unlike partition pruning, ...
https://dev.mysql.com/doc/refman/8.0/en/blackhole-storage-engine.html
The maximum key length is 3072 bytes as of MySQL 8.0.27. This should be borne in mind when considering the behavior of primary key columns that auto increment. Consider the following replication scenario where all three of the following conditions ... The BLACKHOLE storage engine acts as a “black hole” that accepts data but throws it away and does not store ...
https://dev.mysql.com/doc/refman/8.0/en/function-optimization.html
Consequently, the query reads every row of the table, evaluates the predicate for each row, and outputs all rows for which the primary key matches the random value. This UPDATE statement uses a nondeterministic function to select rows to be ...A ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-data-locks-table.html
Primary key values of the locked record are shown for a lock placed on the primary key index. Secondary index values of the locked record are shown with primary key values appended for a lock placed on a secondary index. If there is no primary key, ...For information about which lock requests are blocked by which held locks, see Section 29.12.13.2, “The data_lock_waits ...
https://dev.mysql.com/doc/refman/8.0/en/show-create-table.html
row *************************** Table: t Create Table: CREATE TABLE `t` ( `id` int NOT NULL AUTO_INCREMENT, `s` char(60) DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci As of MySQL 8.0.16, MySQL ...
https://dev.mysql.com/doc/refman/8.0/en/alter-table-examples.html
For NDB tables, it is also possible to change the storage type used for a table or column. row *************************** Table: t1 Create Table: CREATE TABLE `t2` ( `c1` int(11) DEFAULT NULL ) /*!50100 TABLESPACE ts_1 STORAGE DISK */ ...
https://dev.mysql.com/doc/refman/8.0/en/built-in-function-reference.html
The following table lists each built-in (native) function and operator and provides a short description of each one. For a table listing functions that are loadable at runtime, see Section 14.2, “Loadable Function Reference”. ->> Return value ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-columns-table.html
COLUMN_KEY Whether the column is indexed: If COLUMN_KEY is empty, the column either is not indexed or is indexed only as a secondary column in a multiple-column, nonunique index. If COLUMN_KEY is PRI, the column is a PRIMARY KEY or is one of the ...