mirror of
https://git.postgresql.org/git/postgresql.git
synced 2026-02-21 05:46:59 +08:00
eec57115e4
Previously, we would send each line as a separate CopyData message. That's pretty wasteful if the table is narrow, as each CopyData message has 5 bytes of overhead. For efficiency, buffer up and pack 8 kB of input data into each CopyData message. The server also sends each line as a separate CopyData message in COPY TO STDOUT, and that's similarly wasteful. But that's documented in the FE/BE protocol description, so changing that would be a wire protocol break. Reviewed-by: Aleksander Alekseev Discussion: https://www.postgresql.org/message-id/40b2cec0-d0fb-3191-2ae1-9a3fe16a7e48%40iki.fi