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https://dev.mysql.com/doc/refman/8.0/en/atomic-ddl.html
Supported table DDL statements include CREATE, ALTER, and DROP statements for databases, tablespaces, tables, and indexes, and the TRUNCATE TABLE statement. Supported non-table DDL statements include: CREATE and DROP statements, and, if applicable, ...In earlier MySQL versions, metadata was stored in metadata files, nontransactional tables, and storage engine-specific dictionaries, which necessitated intermediate ...An ...
https://dev.mysql.com/doc/refman/8.0/en/merge-storage-engine.html
When you create a MERGE table, MySQL creates a .MRG file on disk that contains the names of the underlying MyISAM tables that should be used as one. Note The use of MERGE tables entails the following security issue: If a user has access to MyISAM ...
https://dev.mysql.com/doc/refman/8.0/en/optimize-table.html
Use OPTIMIZE TABLE in these cases, depending on the type of table: After doing substantial insert, update, or delete operations on an InnoDB table that has its own .ibd file because it was created with the innodb_file_per_table option enabled. By ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-fulltext-index.html
A full-text index is defined as part of a CREATE TABLE statement or added to an existing table using ALTER TABLE or CREATE INDEX. The inverted index is partitioned into six auxiliary index tables to support parallel index creation. Consider ...
https://dev.mysql.com/doc/refman/8.0/en/server-status-variables.html
| Connections | 30023 | | Created_tmp_disk_tables | 0 | | Created_tmp_files | 3 | | Created_tmp_tables | 2 | ... Created_tmp_disk_tables The number of internal on-disk temporary tables created by the server while executing statements. You can ...| ... The MySQL server maintains many status variables that provide information about its ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-persistent-stats.html
You can also configure automatic statistics recalculation for individual tables by specifying the STATS_AUTO_RECALC clause when creating or altering a table. To override these system-wide settings and configure optimizer statistics parameters for ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-information-schema-system-tables.html
The first index is GEN_CLUST_INDEX, which is a clustered index created by InnoDB if the table does not have a user-defined clustered index. If a file-per-table tablespace were created in a location outside the MySQL data directory using the DATA ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-file-per-table-tablespaces.html
File-per-table tablespace characteristics are described under the following topics in this section: File-Per-Table Tablespace Configuration File-Per-Table Tablespace Data Files File-Per-Table Tablespace Advantages File-Per-Table Tablespace ... A ...
https://dev.mysql.com/doc/refman/8.0/en/repair-table.html
If you use USE_FRM for a table that was created by a different version of the MySQL server than the one you are currently running, REPAIR TABLE does not attempt to repair the table. With myisamchk --safe-recover, you can also use options that REPAIR ...[QUICK] [EXTENDED] [USE_FRM] REPAIR TABLE repairs a possibly corrupted table, for certain storage engines ...
https://dev.mysql.com/doc/refman/8.0/en/alter-table-examples.html
row *************************** Table: t1 Create Table: CREATE TABLE `t2` ( `c1` int(11) DEFAULT NULL ) /*!50100 TABLESPACE ts_1 STORAGE DISK */ ENGINE=ndbcluster DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci 1 row in set (0.01 sec) To change ...For NDB tables, it is also possible to change the storage type used for a table or ...If you drop an AUTO_INCREMENT column ...