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You have two things you can look at it. The Mona Lisa. A museum attendant that is pointing to the Mona Lisa. You can't look at them both at the same time. Which do you want to look at it? That's t …

Your indexing is totally irrelevant neither index is used (thus the <1% difference). Did you ANALYZE the table after you created the index? … I would expect the bloom index speed things up by massively reducing the size of the table you have to visit. …

No, an index on IS NOT NULL has no need in itself to visit the table on queries restricted to IS NOT NULL or on queries which can be determined to be not-null. … In fact, on queries restricted to the column where the value IS NOT NULL, you could potentially be doing an INDEX ONLY SCAN which I demonstrate here. …

Command: DROP INDEX Description: remove an index Syntax: DROP INDEX [ CONCURRENTLY ] [ IF EXISTS ] name [, ...] [ CASCADE | RESTRICT ] But yes, the DROP INDEX doesn't even know if the index is on … -- DROP INDEX foo_x_idx; DROP INDEX …

I would suggest both, Making comment_id a PRIMARY KEY: which is both UNIQUE and NOT NULL If shop_name is frequently a part of the query, making shop_name it's own index. …

So you're working at the problem from the wrong angle, the right question isn't Are all of those factors correct to create an index? But instead, For this given query, can I use an index? … That is to say, go ahead and create the index. …

The index works the same way. … The question is after the pages are properly sized for the index, how much extra-space on those pages should be left for future operations? …

Install pg_trgm, CREATE extention pg_trgm; Create either a gist or gin index. … CREATE index test_trgm_gin ON test USING gin (some_text gin_trgm_ops); CREATE index test_trgm_gist ON test USING gist (some_text gist_trgm_ops); See this blog post on depesz for more information. …

At present, I am using a script external to the database to generate the entries_kanji table by iterating over every row in entries, extracting the kanji from each keyword and inserting a row into …

create index plane_tracks_on_created_at on plane_tracks(created_at); create index plane_tracks_on_updated_at on plane_tracks(updated_at); create index plane_tracks_on_created_at_updated_at on plane_tracks … to another compound index. …

Try going with an EXISTS test. First, let's be explicit about where the columns are coming from, also you don't need col = TRUE and col = FALSE on bools. You can simply say WHERE col or WHERE NOT col, …

Since at least PostgreSQL 8.3, PostgreSQL indexes NULL using a bitmap on the index. That means "yes" it's indexed. Except it takes a bit, rather than a byte[s]. …

And dropping the default btree index. Does the text_pattern_ops perform better/worse than the default with C? …

They'll all result in index scans. … a sequential table scan over using the index. …

Will the index be used as a covering index to help the JOIN in the above query? Should I change my index writing strategy to cover foreign key columns? Not likely in the above query. … though this is a lot of work, I suggest starting off with CREATE INDEX ON table2 (t1); CREATE INDEX ON table2 (t2c1); And optimizing only if that isn't sufficient. …