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Insert only table and size of GIN index JSONB field. - Mailing list pgsql-general

From Maxim Boguk
Subject Insert only table and size of GIN index JSONB field.
Date
Msg-id CAK-MWwTJyhvsRzoHwEKf8FbdZZur2fCZEdK3XNwmxoBjDTvSbg@mail.gmail.com
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Responses Re: Insert only table and size of GIN index JSONB field.
Re: Insert only table and size of GIN index JSONB field.
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Hi,

I started with empty table with index over
 custom_fields | jsonb
field
defined as:
    "idx_learners_custom_fields" gin (custom_fields)
Globally gin_pending_list_limit set to 2MB.
Database version is 9.5.2.

Now question:
If table populated with 1M records in single transaction then the final size of the GIN index is:
4265 MB
but after I performed reindex index idx_learners_custom_fields;
the index size had been reduced 15x to 295 MB.

Is this behavior expected?

--
Maxim Boguk
Senior Postgresql DBA
http://www.postgresql-consulting.com/

Phone RU: +7 910 405 4718
Phone AU: +61 45 218 5678

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