Re: Removing a key from jsonb is sloooow

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От Tumasgiu Rossini
Тема Re: Removing a key from jsonb is sloooow
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Msg-id CAJD9AWy1AsBaw8j-0E=4oRLKfEpyVGmv1tgrkZOZ=NzZV2EMmQ@mail.gmail.com
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Ответ на Removing a key from jsonb is sloooow  (Volkan Unsal <spocksplanet@gmail.com>)
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Hi,

Your current query actually process your 10K rows,
it is a bit of an overkill if only a few row contains the key you want to delete.
Depending on how big your json data is, this could be problematic.

Have you considered adding a where clause to your query ?

Also, maybe you could create an index on your jsonb column
to improve the identification of rows which
contains the key you want to delete ?



Le mer. 17 juil. 2019 à 16:31, Volkan Unsal <spocksplanet@gmail.com> a écrit :
I'm trying to remove a key from a jsonb column in a table with 10K rows, and the performance is abysmal. When the key is missing, it takes 5 minutes. When the key is present, it takes even longer.

Test with non-existent key:

>> update projects set misc = misc - 'foo';
Time: 324711.960 ms (05:24.712)

What can I do to improve this?

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