database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-09-02 04:21:28 +03:00
Code Activity

Doc: Update the documentation for FSM behavior for small tables.

Browse Source 
In commit b0eaa4c51b, we have avoided the creation of FSM for small tables.
So the functions that use FSM to compute the free space can return zero for
such tables.  This was previously also possible for the cases where the
vacuum has not been triggered to update FSM.

This commit updates the comments in code and documentation to reflect this
behavior.

Author: John Naylor
Reviewed-by: Amit Kapila
Discussion: https://postgr.es/m/CACPNZCtba-3m1q3A8gxA_vxg=T7gQf7gMbpR4Ciy5LntY-j+0Q@mail.gmail.com
This commit is contained in:
Amit Kapila
2019-02-20 17:37:39 +05:30
parent 41531e42d3
commit 29d108cdec
3 changed files with 8 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
doc/src/sgml/pgfreespacemap.sgml
View File

@@ -61,6 +61,8 @@
The values stored in the free space map are not exact. They're rounded
to precision of 1/256th of <symbol>BLCKSZ</symbol> (32 bytes with default <symbol>BLCKSZ</symbol>), and
they're not kept fully up-to-date as tuples are inserted and updated.
In addition, small tables don't have a free space map, so these functions
will return zero even if free space is available.
</para>
<para>