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Add ideas for concurrent pg_dump and pg_restore:

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< * pg_dump
> * pg_dump / pg_restore
> 	o Allow pg_dump to utilize multiple CPUs and I/O channels by dumping
> 	  multiple objects simultaneously
>
> 	  The difficulty with this is getting multiple dump processes to
> 	  produce a single dump output file.
> 	  http://archives.postgresql.org/pgsql-hackers/2008-02/msg00205.php
>
> 	o Allow pg_restore to utilize multiple CPUs and I/O channels by
>           restoring multiple objects simultaneously
>
> 	  This might require a pg_restore flag to indicate how many
> 	  simultaneous operations should be performed.  Only pg_dump's
> 	  -Fc format has the necessary dependency information.
>
> 	o To better utilize resources, restore data, primary keys, and
>  	  indexes for a single table before restoring the next table
>
> 	  Hopefully this will allow the CPU-I/O load to be more uniform
> 	  for simultaneous restores.  The idea is to start data restores
> 	  for several objects, and once the first object is done, to move
> 	  on to its primary keys and indexes.  Over time, simultaneous
> 	  data loads and index builds will be running.
>
> 	o To better utilize resources, allow pg_restore to check foreign
> 	  keys simultaneously, where possible
> 	o Allow pg_restore to create all indexes of a table
> 	  concurrently, via a single heap scan
>
> 	  This requires a pg_dump -Fc file because that format contains
>           the required dependency information.
> 	  http://archives.postgresql.org/pgsql-general/2007-05/msg01274.php
>
> 	o Allow pg_restore to load different parts of the COPY data
> 	  simultaneously
<   single heap scan, and have a restore of a pg_dump somehow use it
>   single heap scan, and have pg_restore use it
<   http://archives.postgresql.org/pgsql-general/2007-05/msg01274.php
This commit is contained in:
Bruce Momjian 2008-03-04 01:33:32 +00:00
parent b5aae11c73
commit a273d393b7
2 changed files with 70 additions and 9 deletions
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41
doc/TODO
View File

@ -1,7 +1,7 @@
PostgreSQL TODO List
====================
Current maintainer: Bruce Momjian (bruce@momjian.us)
Last updated: Mon Mar 3 16:26:04 EST 2008
Last updated: Mon Mar 3 20:33:10 EST 2008
The most recent version of this document can be viewed at
http://www.postgresql.org/docs/faqs.TODO.html.
@ -819,7 +819,7 @@ Clients
http://archives.postgresql.org/pgsql-hackers/2006-12/msg00255.php
* pg_dump
* pg_dump / pg_restore
o %Add dumping of comments on index columns and composite type columns
o %Add full object name to the tag field. eg. for operators we need
'=(integer, integer)', instead of just '='.
@ -838,6 +838,40 @@ Clients
COMMENT ON CURRENT DATABASE.
o Remove unnecessary function pointer abstractions in pg_dump source
code
o Allow pg_dump to utilize multiple CPUs and I/O channels by dumping
multiple objects simultaneously
The difficulty with this is getting multiple dump processes to
produce a single dump output file.
http://archives.postgresql.org/pgsql-hackers/2008-02/msg00205.php
o Allow pg_restore to utilize multiple CPUs and I/O channels by
restoring multiple objects simultaneously
This might require a pg_restore flag to indicate how many
simultaneous operations should be performed. Only pg_dump's
-Fc format has the necessary dependency information.
o To better utilize resources, restore data, primary keys, and
indexes for a single table before restoring the next table
Hopefully this will allow the CPU-I/O load to be more uniform
for simultaneous restores. The idea is to start data restores
for several objects, and once the first object is done, to move
on to its primary keys and indexes. Over time, simultaneous
data loads and index builds will be running.
o To better utilize resources, allow pg_restore to check foreign
keys simultaneously, where possible
o Allow pg_restore to create all indexes of a table
concurrently, via a single heap scan
This requires a pg_dump -Fc file because that format contains
the required dependency information.
http://archives.postgresql.org/pgsql-general/2007-05/msg01274.php
o Allow pg_restore to load different parts of the COPY data
simultaneously
* ecpg
@ -967,9 +1001,8 @@ Indexes
downtime.
* Allow multiple indexes to be created concurrently, ideally via a
single heap scan, and have a restore of a pg_dump somehow use it
single heap scan, and have pg_restore use it
http://archives.postgresql.org/pgsql-general/2007-05/msg01274.php
* Inheritance

38
doc/src/FAQ/TODO.html
View File

@ -8,7 +8,7 @@
<body bgcolor="#FFFFFF" text="#000000" link="#FF0000" vlink="#A00000" alink="#0000FF">
<h1><a name="section_1">PostgreSQL TODO List</a></h1>
<p>Current maintainer: Bruce Momjian (<a href="mailto:bruce@momjian.us">bruce@momjian.us</a>)<br/>
Last updated: Mon Mar 3 16:26:04 EST 2008
Last updated: Mon Mar 3 20:33:10 EST 2008
</p>
<p>The most recent version of this document can be viewed at<br/>
<a href="http://www.postgresql.org/docs/faqs.TODO.html">http://www.postgresql.org/docs/faqs.TODO.html</a>.
@ -727,7 +727,7 @@ first. There is also a developer's wiki at<br/>
<p> <a href="http://archives.postgresql.org/pgsql-hackers/2006-12/msg00255.php">http://archives.postgresql.org/pgsql-hackers/2006-12/msg00255.php</a>
</p>
</li></ul>
</li><li>pg_dump
</li><li>pg_dump / pg_restore
<ul>
<li>%Add dumping of comments on index columns and composite type columns
</li><li>%Add full object name to the tag field. eg. for operators we need
@ -747,6 +747,36 @@ first. There is also a developer's wiki at<br/>
COMMENT ON CURRENT DATABASE.
</li><li>Remove unnecessary function pointer abstractions in pg_dump source
code
</li><li>Allow pg_dump to utilize multiple CPUs and I/O channels by dumping
multiple objects simultaneously
<p> The difficulty with this is getting multiple dump processes to
produce a single dump output file.
<a href="http://archives.postgresql.org/pgsql-hackers/2008-02/msg00205.php">http://archives.postgresql.org/pgsql-hackers/2008-02/msg00205.php</a>
</p>
</li><li>Allow pg_restore to utilize multiple CPUs and I/O channels by
restoring multiple objects simultaneously
<p> This might require a pg_restore flag to indicate how many
simultaneous operations should be performed. Only pg_dump's
-Fc format has the necessary dependency information.
</p>
</li><li>To better utilize resources, restore data, primary keys, and
indexes for a single table before restoring the next table
<p> Hopefully this will allow the CPU-I/O load to be more uniform
for simultaneous restores. The idea is to start data restores
for several objects, and once the first object is done, to move
on to its primary keys and indexes. Over time, simultaneous
data loads and index builds will be running.
</p>
</li><li>To better utilize resources, allow pg_restore to check foreign
keys simultaneously, where possible
</li><li>Allow pg_restore to create all indexes of a table
concurrently, via a single heap scan
<p> This requires a pg_dump -Fc file because that format contains
the required dependency information.
<a href="http://archives.postgresql.org/pgsql-general/2007-05/msg01274.php">http://archives.postgresql.org/pgsql-general/2007-05/msg01274.php</a>
</p>
</li><li>Allow pg_restore to load different parts of the COPY data
simultaneously
</li></ul>
</li><li>ecpg
<ul>
@ -860,9 +890,7 @@ first. There is also a developer's wiki at<br/>
downtime.
</p>
</li><li>Allow multiple indexes to be created concurrently, ideally via a
single heap scan, and have a restore of a pg_dump somehow use it
<p> <a href="http://archives.postgresql.org/pgsql-general/2007-05/msg01274.php">http://archives.postgresql.org/pgsql-general/2007-05/msg01274.php</a>
</p>
single heap scan, and have pg_restore use it
</li><li>Inheritance
<ul>
<li>Allow inherited tables to inherit indexes, UNIQUE constraints,