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Sql Server Delete Statement In Sql Is Very Slow Stack Overflow

Sql Server Delete Statement In Sql Is Very Slow Stack Overflow
Sql Server Delete Statement In Sql Is Very Slow Stack Overflow

Sql Server Delete Statement In Sql Is Very Slow Stack Overflow You can run the delete in batches (useful if you have triggers, cascade delete, or a large number of records). you can drop and recreate the indexes (best if you can do that in off hours too). 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.

Sql Server Delete Statement In Sql Is Very Slow Stack Overflow
Sql Server Delete Statement In Sql Is Very Slow Stack Overflow

Sql Server Delete Statement In Sql Is Very Slow Stack Overflow When working with sql databases, the delete clause can sometimes be unexpectedly slow, even for seemingly simple queries. a common scenario developers face is when a basic delete statement takes much longer than anticipated, leading to timeouts and performance issues. After every delete of the batch number of rows, delete the rows on #temptable that have been deleted from [dbo]. [mytable1]. this will shorten the length of the temp table so make it a bit. Sqlserver is not optimized for large deletes. generally you can improve performance by deleting in smaller batches (1k to 10k). also if you have cascading deletes, do them first. check if exists deadlocks or blocking. if the table you delete from is referenced by other tables, make sure those other tables have indexes on the foreign key column (s). Unfortunately, there isn’t a quick answer to this, as several factors could be contributing to the delay. let’s explore two of the most common causes i’ve encountered. for this example, i’m using brent ozar’s version of the stack overflow 2010 10gb database. is something blocking my delete? sql server has a feature called blocking.

C Very Very Slow Query Update On Sql Server Stack Overflow
C Very Very Slow Query Update On Sql Server Stack Overflow

C Very Very Slow Query Update On Sql Server Stack Overflow Sqlserver is not optimized for large deletes. generally you can improve performance by deleting in smaller batches (1k to 10k). also if you have cascading deletes, do them first. check if exists deadlocks or blocking. if the table you delete from is referenced by other tables, make sure those other tables have indexes on the foreign key column (s). Unfortunately, there isn’t a quick answer to this, as several factors could be contributing to the delay. let’s explore two of the most common causes i’ve encountered. for this example, i’m using brent ozar’s version of the stack overflow 2010 10gb database. is something blocking my delete? sql server has a feature called blocking. We are running a delete statement on database every weekend where it deletes rows based on the 16 where conditions. it has to pass 16 where conditions before delete more than millions row. When i delete large number of rows, around 400,000 records, the transaction takes forever to finish. the table is not partitioned and the database is running on sql server 2012 standard edition. i'm using nhibernate as orm. how do i make the transaction faster? here the creation script of the table. [ddp id] [numeric](18, 0) identity(1,1) not null,. Although the difference is clear (much more data size wise is deleted), i'm am eager to learn more about what happens inside sql server. so that i can better understand the latter deletes to be so much slower. When i execute now a delete of 1 record, the execution time is above 60secs. the statement i execute is a direct delete from tblas0002 where id=2218801. see execution plan below in a public link. looking into the execution plan, i can see only one operation taking over 1 minute, and it is a scan of the primary key index of the tblas0002. but why?.

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