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Is it slow to delete rows in SQL?
You can drop and recreate the indexes (best if you can do that in off hours too). Deleting a lot of rows can be very slow. Try to delete a few at a time, like:
How long does it take to delete a row in MySQL?
MySQL DELETE becomes exceptionaly slow with a large number of rows. When performing a DELETE against a large number of rows in the Prices table, the DELETE becomes progressively slower. If deleting 15,000 rows it runs in about 15 seconds. 20K rows takes 3 or 4 minutes.
Which is slower in or out in SQL?
@Alex is right that IN is slower than =, so if you can do this, you’ll be better off: But better still is using numbers rather than strings to find the rows (sql likes numbers): In either event, make sure you have an index on column [COL] to speed up the table scan.
How to speed up the DELETE statement in SQL?
In either event, make sure you have an index on column [COL] to speed up the table scan. If you’re deleting all the records in the table rather than a select few it may be much faster to just drop and recreate the table.
Why is delete in Big Table so slow?
delete can be slow if big table has recursive foreign key. if so, find opportune time, disable dependend services, disable recursive foreign key, perform massive delete, then restore foreign key again.
Is the empty table in SQL Server slow?
SQL Server “empty table” is slow after deleting all (12 million) records? I have a SQL Server 2008 instance with approximately 150 columns. I have previously populated this table with approximately 12 million entries, but have since cleared the table in preparation for a new data set.
Why does SQL delete take so much time?
I have an Azure SQL server (standard tier, S3) with tables. I have a specific query that takes very long time to be executed: This table has 150K rows. The delete query takes +-10 minutes. I tried to understand why. First check is how fast is locate this row in SELECT query.