Isn't easier to reduce the table every day and make a daily vacuum which only
lasts a few seconds?
Joerg Hessdoerfer wrote:
> Hi!
>
> I have an application, where I have to insert data into a table at several
> rows per second, 24 hours a day, 365 days a year.
>
> After some period (a week, maybe a month) the data will be reducted to some
> degree and deleted from the table.
>
> As far as I understood, I would have to use VACUUM to really free the table
> from deleted rows - but VACUUM (esp. on a table with several million rows)
> takes some time and prevents me from inserting new data.
>
> Now, I thought I could just rename the table, inserting into a temp table, and
> switch the tables back after VACUUMing. Ideally, this should work unnoticed
> (and thus without prog. effort) on the client (inserter) side.
>
> Question: would it work to use a transaction to perform the rename?
>
> i.e.: continuous insert into table 'main' from client.
>
> From somewhere else, execute:
>
> begin;
> alter table main rename to vac_main;
> create table main (...);
> end;
>
> would the inserter notice this? Read: would ALL inserts AT ANY TIME succeed?
>
> I know, I could simulate such functionality in the client (inserter). But it
> seems more elegant this way...
>
> Greetings,
> Joerg
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