VACUUM and other maintenance work

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От Christian Hofmann
Тема VACUUM and other maintenance work
Дата
Msg-id 20050401130031.979AA53245@svr1.postgresql.org
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Ответы Re: VACUUM and other maintenance work  (Tom Lane <tgl@sss.pgh.pa.us>)
Список pgsql-novice
Hello,

regarding the last messages dealing with losing data when not vacuum the
database regulary, I have some questions:

1. When I make the query "SELECT datname, age(datfrozenxid) FROM
pg_database;" I get the following result:

datname;age
test;1073742421
my_db;1073742732
template1;1073742548
template0;19741

Everytime I am repeating this query, the values are increasing by 5. I
thinks thats ok?

It is not possible to vacuum the template0 database because it is switched
of, and so I can't connect to the databse.
Does an overflow of the datfrozenxid in the template0 DB matter or cause
problems in any way?

2. Connecting, maybe by a cron job, to the database and submitting the query
"VACUUM ANALYZE" will prevent me from losing data from not vacuuming. Is
that correct?

3. Are there other things I should do regulary in order not to lose the data
in the database?

Thanks,

Christian



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