Postgresql: Re: Creating Indexes For Mac
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No, you don't generally need to reindex after TRUNCATE - 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 - Pg automatically drops the index during TRUNCATE and then incrementally rebuilds it as you insert data, so there's no index bloat held over from before the TRUNCATE. You may get somewhat more compact and efficient indexes if you drop the indexes, truncate, insert the data, and recreate the indexes. They'll certainly be faster to build.
Postgresql: Re: Creating Indexes For Mac Free
The difference in index performance once built is unlikely to be enough to warrant the extra effort for most applications using just b-tree indexes, but the difference in the time required to populate tables can be well worth it. If you're using GiST or (especially) GIN it's really best to drop the index and re-create at the end. 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.
Build-time was 164ms (inserts) + 347ms (index) vs 742ms (inserts+index). This difference is significant, but not enough to be a huge concern unless you're doing large scale DW.
A REINDEX took a further 342ms after the inserts+index run. See So, @TomTom is right (unsurprisingly) in that it can be worth dropping and re-creating indexes if it's convenient to do so, like if you're bulk-populating tables for OLAP work. However, reindexing is likely to be the wrong answer since it means you do a whole bunch of expensive work to create an index you then throw away.
Drop the index and re-create it instead of reindexing.