Re: 8.2 Autovacuum BUG ?
| От | Mikko Partio |
|---|---|
| Тема | Re: 8.2 Autovacuum BUG ? |
| Дата | |
| Msg-id | 2ca799770708311131r5ae5e3eera66a7cea1fc5917d@mail.gmail.com обсуждение исходный текст |
| Ответ на | Re: 8.2 Autovacuum BUG ? (Alvaro Herrera <alvherre@commandprompt.com>) |
| Ответы |
Re: 8.2 Autovacuum BUG ?
|
| Список | pgsql-performance |
On 8/31/07, Alvaro Herrera <alvherre@commandprompt.com> wrote:
Pallav Kalva wrote:
> Tom Lane wrote:
>> Probably represents freezing of old tuples, which is a WAL-logged
>> operation as of 8.2. Is it likely that the data is 200M transactions
>> old?
>>
> If nothing changed on these tables how can it freeze old tuples ?
> Does it mean that once it reaches 200M transactions it will do the same
> thing all over again ?
No -- once tuples are frozen, they don't need freezing again (unless
they are modified by UPDATE or DELETE).
Off-topic question: the documentation says that XID numbers are 32 bit. Could the XID be 64 bit when running on a 64 bit platform? That would effectively prevent wrap-around issues.
Regards
MP
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