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Which is faster select into or insert into?
INTO was considerably faster 489ms compared to 3241ms. The INSERT… INTO command will reuse data pages which are created in cache for insert/update/delete operations. INTO command will create new pages for table creation similar to regular tables and will physically remove them when the temporary table is dropped.
What is the difference between INSERT into to select?
Differences. INSERT INTO SELECT inserts into an existing table. SELECT INTO creates a new table and puts the data in it. If one of the source columns is an identity column and meets certain conditions (no JOINs in the query for example) then the column in the new table will also be an identity.
Is select into slow?
In general insert..select is slower because it’s a fully logged operation. select into is minimally logged in the simple and bulk logged recovery models.
Which is faster a temporary table or a new query?
If the database will not be mistaken with the choice of the query plan, it will perform the old query faster than a new one. However, this slowdown will always be negligible. Typically the creation of a temporary table takes a few milliseconds. That is, the delay can not have a significant impact on system performance, and usually can be ignored.
Which is better select into or insert into temp table?
When there is a large amount of comma separated values as the input parameter, the code can be delayed for a few seconds while inserting the data into the temp table. As alternate solution we can use is the SELECT…INTO command which generally performs better than the INSERT…SELECT command.
Are there any problems using select into in tempdb?
There is some confusion about problems that can happen with the use of SELECT…INTO using temporary tables. SELECT…INTO has gained a somewhat unfair reputation for this, but it was part of a more general problem involving latch contention in tempdb under a heavy load of small temp table creation and deletion.
Why is SQL Server insert into temp table slow?
I think the problem lays in the temp table insert. I did try to apply an index to the temp table but this will only reduce performance as: The number of indexes on a table is the most dominant factor for insert performance. The more indexes a table has, the slower the execution becomes.