Postgres Pro
Downloads
Home   >   mailing lists

Unexpected (bad) performance when querying indexed JSONB column - Mailing list pgsql-performance

From Christian Weyer
Subject Unexpected (bad) performance when querying indexed JSONB column
Date
Msg-id 0776A628-6450-4E46-B059-1BAD56BA50AE@thinktecture.com
Whole thread Raw
List pgsql-performance
Tree view
Hi all,

The pg version in question is the latest 9.4., running on Windows.

For testing out the NoSQL features of pg I have a simple table called ‘articles’ with a column called ‘data’.

There is an index on ‘data’ like this:
  CREATE INDEX idx_data ON articles USING gin (data jsonb_path_ops);

The current test data set has 32570 entires of JSON docs like this:
{
"title": "Foo Bar",
"locked": true, 
"valid_until": "2049-12-31T00:00:00", 
"art_number": 12345678, 
"valid_since": "2013-10-05T00:00:00", 
"number_valid": false, 
"combinations": {
"var1": "4711", 
"var2": "4711", 
"var3": "0815", 
"int_art_number": "000001"
}
}

Nothing too complex, I think.

When I run a simple query:
  SELECT data  #>> ‘{"title"}' 
  FROM articles
  WHERE data @> '{ “locked" : true }';

Reproducingly, it takes approx. 900ms to get the results back.
Honestly, I was expecting a much faster query.

Any opinions on this?

Thanks,
-C.

pgsql-performance by date:

Previous
From: Pavel Stehule
Date:
Subject: Re: Query performance
Next
From: Christian Weyer
Date:
Subject: Re: Unexpected (bad) performance when querying indexed JSONB column