| From: | Simon Riggs <simon(at)2ndQuadrant(dot)com> |
|---|---|
| To: | Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com> |
| Cc: | pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Summary and Plan for Hot Standby |
| Date: | 2009-11-15 19:43:39 |
| Message-ID: | 1258314219.14054.2608.camel@ebony |
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| Thread: | |
| Lists: | pgsql-hackers |
On Sun, 2009-11-15 at 21:20 +0200, Heikki Linnakangas wrote:
> Simon Riggs wrote:
> > On Sun, 2009-11-15 at 20:30 +0200, Heikki Linnakangas wrote:
> >
> >> The LSN doesn't help there, because when an itemid is marked as dead,
> >> the LSN is not updated.
> >
> > I was thinking we could update the index block LSN without writing WAL
> > using the LSN of the heap block that leads to the killed tuple.
>
> That can be before the cleanup record we write before we start the index
> vacuum.
Oh well. Strike 1.
But the technique sounds OK, we just need to get the LSN of a HeapInfo
record from somewhere, say, index metapage. Sounds like we need to do
something similar with the xid.
--
Simon Riggs www.2ndQuadrant.com
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