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| author | Marti Raudsepp <marti@juffo.org> | 2013-12-12 21:26:57 +0200 |
|---|---|---|
| committer | Tim Graham <timograham@gmail.com> | 2013-12-14 12:34:45 -0500 |
| commit | 75ec1fdf16ac76b5c945aef1cdb9a1e104369c85 (patch) | |
| tree | afa4b558f75ba348009aed3a9efb1b0cd536a9bd /docs/ref | |
| parent | 668571386926ff5453d0e11f59b0a89c0dc1dfa2 (diff) | |
Clarifed table rewrites in migration docs.
Small nitpicks. All column-related ALTER TABLE commands take an
exclusive table lock in PostgreSQL. The difference is that adding a
column without default doesn't cause a table rewrite, so the lock is
held only for a short time.
The time taken is more accurately proportional to table size, not row
count.
Diffstat (limited to 'docs/ref')
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