Re: COPY vs INSERT
От | David Roussel |
---|---|
Тема | Re: COPY vs INSERT |
Дата | |
Msg-id | 1115246490.1709.233393619@webmail.messagingengine.com обсуждение исходный текст |
Ответ на | Re: COPY vs INSERT (Mischa Sandberg <mischa.sandberg@telus.net>) |
Ответы |
Re: COPY vs INSERT
Re: COPY vs INSERT Re: COPY vs INSERT |
Список | pgsql-performance |
> COPY invokes all the same logic as INSERT on the server side > (rowexclusive locking, transaction log, updating indexes, rules). > The difference is that all the rows are inserted as a single > transaction. This reduces the number of fsync's on the xlog, > which may be a limiting factor for you. You'll want to crank > WAL_BUFFERS and CHECKPOINT_SEGMENTS to match, though. > One of my streams has 6K records; I run with WB=1000, CS=128. So what's the difference between a COPY and a batch of INSERT statements. Also, surely, fsyncs only occur at the end of a transaction, no need to fsync before a commit has been issued, right? David
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