What is the difference between select into and insert into

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Kenneth Fisher , Every now and again I see people getting confused by the similarities and missing the differences. So here is a quick check list. Log in or register to rate. I've grown up reading Tom Clancy and probably most of you have at least seen Red October, so this book caught my eye when browsing used books for a recent trip. It's a fairly human look at what's involved in sailing on a Trident missile submarine These tables are visible and accessible within the session only.

In addition, SQL Server maintains statistics for temporary tables. Temporary tables are cached in buffer pool as compared to permanent disk based tables. When the table is created later, SQL Server will reuse the earlier pages, which reduces the number of page modifications required. Generally speaking, the performance of both options are similar for a small amount of data. Data is inserted quickly in the temporary table, but if the amount of data is large then we can experience poor query performance.

This usually happens with temporary tables when we insert a large number of rows. 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. The above examples are very small, so let's use the example below to see how this performs with a large amount of data.

This test will have over a million rows. Because SQL Server has now exclusive access to the entire table, it no longer needs to worry about concurrency and locking, and it can just go ahead and dump data into the table. There are no minimally logged operations in the FULL recovery model.

However, providing the query hint to lock the entire destination table, the two statements perform exactly the same. The Coeo Blog. Subscribe to Email Updates. Database in restoring state and single user mode?