In MS SQL Server, can you run reindex tables in parallel?

Yes, in MS SQL Server, you can run index rebuilds in parallel by using multiple CPU cores, but this is managed internally by SQL Server and depends on a few factors, such as the version of SQL Server, the edition (Enterprise vs. Standard), and system resources like CPU and memory.

To explicitly run index rebuilds or reorganizations in parallel, you can schedule them across multiple sessions using SQL Server Agent jobs or manual scripting.

1. SQL Server Enterprise Edition allows parallel index rebuilds using the MAXDOP option, which controls the degree of parallelism. Here’s an example:

sqlCopy codeALTER INDEX ALL ON [YourTableName]
REBUILD WITH (MAXDOP = 4);

This rebuilds all indexes on the table in parallel using 4 processors. You can adjust the MAXDOP value based on your system's CPU cores.

2. Multiple Tables or Indexes: If you want to rebuild multiple tables or indexes in parallel, you can script it to run in separate sessions. For example, using SQL Server Agent jobs or PowerShell scripts to trigger multiple index rebuild operations concurrently.