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Truncate table updating statistics oracle question to ask while dating

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The users cannot see the indexes, they are just used to speed up searches/queries.

Note: Updating a table with indexes takes more time than updating a table without (because the indexes also need an update).

Every week we reload this with new data, so we've been using TRUNCATE to clear it out and then inserting new rows. If I don't drop and recreate the indexes, will I need to reindex after every truncation and repopulation, or is that unnecessary?

Should I be running VACUUM after TRUNCATE, or is that also unnecessary?

If it's convenient to do so, drop the indexes and add them back at the end, just don't worry too much if this isn't practical for you.

For a regular b-tree in my test an incrementally created composite index was 3720kb vs a one-off created index of 2208kb.

Indexes are used to retrieve data from the database very fast.

This may be very unfortunate, if you have (some, but) one very big table in your database, which needs almost all the storage...

;(In this case, it is a very bad idea to optimize this table.

- and if you do, you're much better off dropping the indexes, loading data, then re-creating the indexes at the end.

It's somewhat similar to this answer about cluster - Pg automatically drops the index during .