Thread
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Index only scans wiki page
Jeff Janes <jeff.janes@gmail.com> — 2012-11-13T01:03:54Z
https://wiki.postgresql.org/wiki/Index-only_scans This page is seriously out of date. It suggests they are not yet implemented, but only being talked about. Would someone who knows a lot about the subject (which is why I'm sending this hackers, not web) like to take a whack at updating this? Otherwise, I'd like to just replace the whole page with a discussion of the limitations and trade-offs involved in using them as they currently exist Thanks, Jeff
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Re: Index only scans wiki page
Peter Geoghegan <peter@2ndquadrant.com> — 2012-11-13T01:25:38Z
On 13 November 2012 01:03, Jeff Janes <jeff.janes@gmail.com> wrote: > https://wiki.postgresql.org/wiki/Index-only_scans > > This page is seriously out of date. It suggests they are not yet > implemented, but only being talked about. Attached is a piece I wrote on the feature. That might form the basis of a new wiki page. Feel free to incorporate this material as you see fit. -- Peter Geoghegan http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Training and Services
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Re: Index only scans wiki page
Robert Haas <robertmhaas@gmail.com> — 2012-11-13T16:37:19Z
On Mon, Nov 12, 2012 at 8:25 PM, Peter Geoghegan <peter@2ndquadrant.com> wrote: > On 13 November 2012 01:03, Jeff Janes <jeff.janes@gmail.com> wrote: >> https://wiki.postgresql.org/wiki/Index-only_scans >> >> This page is seriously out of date. It suggests they are not yet >> implemented, but only being talked about. > > Attached is a piece I wrote on the feature. That might form the basis > of a new wiki page. Feel free to incorporate this material as you see > fit. I found this an interesting read. As one of the people who worked on the feature, I'm sort of curious whether people have any experience yet with how this actually shakes out in the field. Are you (or is anyone) aware of positive/negative field experiences with this feature? -- Robert Haas EnterpriseDB: http://www.enterprisedb.com The Enterprise PostgreSQL Company
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Re: Index only scans wiki page
Peter Geoghegan <peter@2ndquadrant.com> — 2012-11-13T22:48:06Z
On 13 November 2012 16:37, Robert Haas <robertmhaas@gmail.com> wrote: > I found this an interesting read. As one of the people who worked on > the feature, I'm sort of curious whether people have any experience > yet with how this actually shakes out in the field. Are you (or is > anyone) aware of positive/negative field experiences with this > feature? Unfortunately, I don't think that I have any original insight about the problems with index-only scans in the field right now. -- Peter Geoghegan http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Training and Services
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Re: Index only scans wiki page
Peter Geoghegan <peter@2ndquadrant.com> — 2012-11-13T22:56:20Z
On 13 November 2012 16:37, Robert Haas <robertmhaas@gmail.com> wrote: > I found this an interesting read. As one of the people who worked on > the feature, I'm sort of curious whether people have any experience > yet with how this actually shakes out in the field. Are you (or is > anyone) aware of positive/negative field experiences with this > feature? Unfortunately, I don't think that I have any original insight about the problems with index-only scans in the field right now. -- Peter Geoghegan http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Training and Services
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Re: Index only scans wiki page
Peter Geoghegan <peter@2ndquadrant.com> — 2012-11-15T22:25:55Z
On 13 November 2012 01:25, Peter Geoghegan <peter@2ndquadrant.com> wrote: > Attached is a piece I wrote on the feature. That might form the basis > of a new wiki page. Since no one else moved on this, I've completely replaced the existing page with the contents of the user-orientated document I posted. I don't believe that any of the information that has been removed was of general interest, since it only existed as a developer-orientated page. If anyone thinks that I shouldn't have removed everything that was there, or indeed who would like to change what I've added, well, it's a wiki. -- Peter Geoghegan http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Training and Services