Horton

Re: ALTER TABLE lock strength reduction patch is unsafe

Noah Misch <noah@leadboat.com>

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From: Noah Misch <noah@leadboat.com>
To: Simon Riggs <simon@2ndQuadrant.com>
Cc: Tom Lane <tgl@sss.pgh.pa.us>, Robert Haas <robertmhaas@gmail.com>, Bruce Momjian <bruce@momjian.us>, pgsql-hackers <pgsql-hackers@postgresql.org>
Date: 2012-01-02T18:06:26Z
Lists: pgsql-hackers

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →

  1. Add bytea_agg, parallel to string_agg.

  2. Fix ALTER TABLE ONLY .. DROP CONSTRAINT.

On Mon, Jan 02, 2012 at 05:09:16PM +0000, Simon Riggs wrote:
> Attached patch makes SnapshotNow into an MVCC snapshot, initialised at
> the start of each scan iff SnapshotNow is passed as the scan's
> snapshot. It's fairly brief but seems to do the trick.

That's a neat trick.  However, if you start a new SnapshotNow scan while one is
ongoing, the primordial scan's snapshot will change mid-stream.