How do you remove a non-clustered index?
To drop a clustered or nonclustered index, issue a DROP INDEX command. When you do this, the metadata, statistics, and index pages are removed.
Can you rebuild a clustered index?
To efficiently rebuild a clustered index, the CREATE INDEX command provides the DROP_EXISTING option. This option can rebuild the clustered index in a single atomic step and re-creates the non-clustered indexes of the table only once depending on the index definition.
Why does rebuild index not free up space?
You’ve rebuilt your indexes and saved some space inside the data file. This means that as you add more data (to this and other tables), the data file doesn’t immediately have to grow to make room for the new data. This is a good thing. Growing a file is an expensive, blocking operation, and you want to minimize this.
Why do I need to drop unused indexes?
One of the reasons provided to drop “unused” indexes is to save a disk space. Storage these days becomes cheaper and cheaper, so it’s not as big of a deal as it was before. Also, with data compression, you can save disk space in some cases.
How is disk space calculated for clustered index?
As a result of creating a clustered index, the two nonclustered indexes must be rebuilt to replace the row indicator with the new clustered index key. In the following steps, both temporary disk space to be used during the index operation and permanent disk space to store the new indexes are calculated.
How much disk space is needed for index create memory server?
Additional disk space (in the target location) equal to the Configure the index create memory Server Configuration Option value = 2 MB. Total size of temporary disk space with SORT_IN_TEMPDB set to OFF = 2 MB. Using tempdb, a total of 1018 MB (816 + 202) would be needed to create the clustered and nonclustered indexes.