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https://dev.mysql.com/doc/refman/8.0/en/derived-tables.html
See Section 10.2.2.4, “Optimizing Derived Tables, View References, and Common Table Expressions with Merging or Materialization”. For information about lateral derived tables preceded by the LATERAL keyword, see Section 15.2.15.9, “Lateral ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-information-schema-system-tables.html
row *************************** INDEX_ID: 111 NAME: GEN_CLUST_INDEX TABLE_ID: 71 TYPE: 1 N_FIELDS: 0 PAGE_NO: 3 SPACE: 57 MERGE_THRESHOLD: 50 *************************** 2. row *************************** INDEX_ID: 112 NAME: i1 TABLE_ID: 71 TYPE: 0 ... You can extract metadata about schema objects managed by InnoDB using InnoDB INFORMATION_SCHEMA ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-locking.html
The reason conflicting gap locks are allowed is that if a record is purged from an index, the gap locks held on the record by different transactions must be merged. Shared and Exclusive Locks Intention Locks Record Locks Gap Locks Next-Key Locks ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-online-ddl-space-requirements.html
Each temporary sort file is large enough to hold one column of data, and each sort file is removed when its data is merged into the final table or index. Disk space requirements for online DDL operations are outlined below. The requirements do not ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-performance-schema.html
This section provides a brief introduction to InnoDB integration with Performance Schema. For comprehensive Performance Schema documentation, see Chapter 29, MySQL Performance Schema. You can profile certain internal InnoDB operations using the ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-physical-structure.html
If the fill factor of an InnoDB index page drops below the MERGE_THRESHOLD, which is 50% by default if not specified, InnoDB tries to contract the index tree to free the page. For more information, see Section 17.8.11, “Configuring the Merge ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-read-only-instance.html
How It Works When the server is run in read-only mode through the --innodb-read-only option, certain InnoDB features and components are reduced or turned off entirely: No change buffering is done, in particular no merges from the change buffer. You ...
https://dev.mysql.com/doc/refman/8.0/en/internal-locking.html
Table-Level Locking MySQL uses table-level locking for MyISAM, MEMORY, and MERGE tables, permitting only one session to update those tables at a time. This section discusses internal locking; that is, locking performed within the MySQL server ...
https://dev.mysql.com/doc/refman/8.0/en/json-functions.html
Functions that return JSON values always perform normalization of these values (see Normalization, Merging, and Autowrapping of JSON Values), and thus orders them. The functions described in this section perform operations on JSON values. For ...
https://dev.mysql.com/doc/refman/8.0/en/keywords.html
Certain keywords, such as SELECT, DELETE, or BIGINT, are reserved and require special treatment for use as identifiers such as table and column names. This may also be true for the names of built-in functions. Some keywords which are otherwise ...