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How long does it take to TRUNCATE a table?
1 Answer. If there are zero transactions locking the table schema, the TRUNCATE TABLE command will finish near-instantaneously. The most i have waited so far was 0.1 seconds for truncating a 25GB table.
Does TRUNCATE table delete all rows?
The truncate command removes all rows of a table. We cannot use a Where clause in this. It is a DDL command. SQL Delete command places lock on each row requires to delete from a table.
Why does TRUNCATE take so long?
The table is not large and only has a few thousands records. For some reason, the TRUNCATE TABLE command takes really long time to execute (both on the master and on the slave). It takes about 400K ms to execute!! When it runs on the slave, it causes it to lag from the Master.
Does TRUNCATE table reset statistics?
Stats are not automatically updated until the stats are needed again. aka, the TRUNCATE does not do it. So “No”.
How can I delete all rows in a table without removing the table structure attributes and index?
DELETE statement Syntax DELETE FROM table_name WHERE Condition; To remove all the rows from the table: DELETE FROM table_name; This statement removes all the records from table but the table itself is not deleted, thus table structure, attributes and indexes remains intact.
Are there any myths about the TRUNCATE TABLE?
For some other myths surrounding truncate, see A SQL Server DBA myth a day: (19/30) TRUNCATE TABLE is non-logged by Paul S. Randal. Thanks for contributing an answer to Database Administrators Stack Exchange!
How is deallocation done in a TRUNCATE TABLE?
For large tables, the actual deallocation is done asynchronously on a background thread ( SQL Server 2000 SP3 onward ). For some other myths surrounding truncate, see A SQL Server DBA myth a day: (19/30) TRUNCATE TABLE is non-logged by Paul S. Randal.
When to truncate a table in SQL Server?
Truncate will potentially need to wait until existing reads are done to acquire a Sch-M (schema modification) lock. For large tables, the actual deallocation is done asynchronously on a background thread ( SQL Server 2000 SP3 onward ).