database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-07-27 12:41:57 +03:00
Code Activity

btree: Support parallel index scans.

Browse Source 
This isn't exposed to the optimizer or the executor yet; we'll add
support for those things in a separate patch.  But this puts the
basic mechanism in place: several processes can attach to a parallel
btree index scan, and each one will get a subset of the tuples that
would have been produced by a non-parallel scan.  Each index page
becomes the responsibility of a single worker, which then returns
all of the TIDs on that page.

Rahila Syed, Amit Kapila, Robert Haas, reviewed and tested by
Anastasia Lubennikova, Tushar Ahuja, and Haribabu Kommi.
This commit is contained in:
Robert Haas
2017-02-15 07:41:14 -05:00
parent 8569955ee3
commit 569174f1be
8 changed files with 527 additions and 50 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
doc/src/sgml/monitoring.sgml
View File

@ -1207,7 +1207,7 @@ postgres 27093 0.0 0.0 30096 2752 ? Ss 11:34 0:00 postgres: ser
<entry>Waiting in an extension.</entry>
</row>
<row>
<entry morerows="9"><literal>IPC</></entry>
<entry morerows="10"><literal>IPC</></entry>
<entry><literal>BgWorkerShutdown</></entry>
<entry>Waiting for background worker to shut down.</entry>
</row>
@ -1215,6 +1215,10 @@ postgres 27093 0.0 0.0 30096 2752 ? Ss 11:34 0:00 postgres: ser
<entry><literal>BgWorkerStartup</></entry>
<entry>Waiting for background worker to start up.</entry>
</row>
<row>
<entry><literal>BtreePage</></entry>
<entry>Waiting for the page number needed to continue a parallel btree scan to become available.</entry>
</row>
<row>
<entry><literal>ExecuteGather</></entry>
<entry>Waiting for activity from child process when executing <literal>Gather</> node.</entry>