Search Results
https://dev.mysql.com/doc/heatwave/en/mys-hw-lakehouse-table-syntax-json.html
External tables use table-level and column-level ENGINE_ATTRIBUTE options of the CREATE TABLE statement to specify the parameters needed to process data stored externally in Object Storage. CREATE EXTERNAL TABLE table_name (col_name data_type ...
https://dev.mysql.com/doc/refman/8.4/en/merge-table-problems.html
The following are known problems with MERGE tables: MERGE child tables are locked through the parent table. If the parent is a temporary table, it is not locked, and thus the child tables are also not locked; this means that parallel use of the ...
https://dev.mysql.com/doc/heatwave/en/mys-hw-lakehouse-table-syntax-sql.html
As of MySQL 9.4.0, you can set external table options using SQL syntax. The following options apply to CREATE TABLE and ALTER TABLE statements. For ALTER TABLE statements, ADD COLUMN is not supported for external tables. This topic contains the ...
https://dev.mysql.com/doc/refman/8.4/en/alter-table-partition-operations.html
Partitioning-related clauses for ALTER TABLE can be used with partitioned tables for repartitioning, to add, drop, discard, import, merge, and split partitions, and to perform partitioning maintenance. Simply using a partition_options clause with ...This statement cannot be used with HASH or KEY partitions; instead, use COALESCE PARTITION (see later in this ...
https://dev.mysql.com/doc/refman/8.4/en/converting-tables-to-innodb.html
If you have MyISAM tables that you want to convert to InnoDB for better reliability and scalability, review the following guidelines and tips before converting. Note Partitioned MyISAM tables created in previous versions of MySQL are not compatible ...See Section 26.6.2, “Partitioning Limitations Relating to Storage Engines”, for more ...
https://dev.mysql.com/doc/refman/8.4/en/optimize-table.html
OPTIMIZE TABLE reorganizes the physical storage of table data and associated index data, to reduce storage space and improve I/O efficiency when accessing the table. The exact changes made to each table depend on the storage engine used by that ...
https://dev.mysql.com/doc/refman/8.4/en/internal-temporary-tables.html
In some cases, the server creates internal temporary tables while processing statements. The server creates temporary tables under conditions such as these: Evaluation of UNION statements, with some exceptions described later. Evaluation of some ...
https://dev.mysql.com/doc/refman/8.4/en/create-table-select.html
You can create one table from another by adding a SELECT statement at the end of the CREATE TABLE statement: CREATE TABLE new_tbl [AS] SELECT * FROM orig_tbl; MySQL creates new columns for all elements in the SELECT. For example: mysql> CREATE ...
https://dev.mysql.com/doc/refman/8.4/en/innodb-information-schema-system-tables.html
You can extract metadata about schema objects managed by InnoDB using InnoDB INFORMATION_SCHEMA tables. The InnoDB INFORMATION_SCHEMA table interface allows you to query this data using SQL. InnoDB INFORMATION_SCHEMA schema object tables include ...
https://dev.mysql.com/doc/refman/8.4/en/innodb-file-per-table-tablespaces.html
A file-per-table tablespace contains data and indexes for a single InnoDB table, and is stored on the file system in a single data file. File-per-table tablespace characteristics are described under the following topics in this section: ...Changing ...