CREATE INDEX test_idx2 ON test_table (col2) WITH (ONLINE = ON, RESUMABLE = ON, MAX_DURATION = 240); -- Pause a running resumable online index creation ALTER INDEX test_idx1 ON test_table PAUSE; ALTER INDEX test_
–CREATE INDEX: Initiates the creation of an index. –UNIQUE (optional): Specifies that the index values must be unique across the table. –index_name: Specifies the name of the index being created. –table_name: The name of the table on which the index is being created. –(column1 [...
https://www.postgresql.org/docs/devel/sql-createindex.html#SQL-CREATEINDEX-CONCURRENTLY Building Indexes Concurrently Creating an index can interfere with regular operation of a database. NormallyPostgreSQL locks the table to be indexed against writes and performs the entire index build with a single...
- Building Index storing the intermediate sort result in user’s database vs. storing in tempdb database (SORT_IN_TEMPDB): When you create or rebuild Index you can choose which database to use to store the intermediate sort results, generated during index creation. It can be eithe...
Fast Index Creation工作原理 创建索引:对于辅助索引的创建,InnoDB会对创建索引的表加一个S锁。创建的过程中,不需要重建表,因此速度较之前提高很多,并且数据库的可用性也得到了提高 删除索引:删除辅助索引操作就更简单了,InnoDB只需更新内部视图,并将辅助索引的空间标记为可用,同时删除MySQL数据库内部视图上对该表的索...
In addition to the space required in the user database to create the index,tempdbmust have about the same amount of additional space to hold the intermediate sort results. For more information, seetempdb and Index Creation. In backward compatible syntax, WITH SORT_IN_TEMPDB is equivalent to WI...
To work around this issue, move the online index operation outside of the transaction, or move it before any data modifications in the same transaction. Disk space considerations Online index operations require more disk space than offline index operations. During index creation and index rebuild ...
Specify whether the creation of the index will be logged (LOGGING) or not logged (NOLOGGING) in the redo log file. This setting also determines whether subsequent Direct Loader (SQL*Loader) and direct-path INSERT operations against the index are logged or not logged. LOGGING is the default....
The creation of the clustered columnstore index changes the storage for the entire table from rowstore to columnstore. SQL コピー CREATE TABLE dbo.SimpleTable( ProductKey [INT] NOT NULL, OrderDateKey [INT] NOT NULL, DueDateKey [INT] NOT NULL, ShipDateKey [INT] NOT NULL); GO CREATE ...
When clustered and nonclustered indexes are built, or rebuilt, in a single online index operation (for example, during the initial clustered index creation on a table that contains one or more nonclustered indexes) two short-term S locks are acquired during the build phase followed by long-...