Commit a3115f0

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Only WAL-log the modified portion in an UPDATE, if possible.

When a row is updated, and the new tuple version is put on the same page as the old one, only WAL-log the part of the new tuple that's not identical to the old. This saves significantly on the amount of WAL that needs to be written, in the common case that most fields are not modified. Amit Kapila, with a lot of back and forth with me, Robert Haas, and others.

1 parent 17d787a commit a3115f0Copy full SHA for a3115f0

4 files changed

+285

-65

lines changed

src
- backend/access
  - heap
    - heapam.c
  - transam
    - xlog.c
- include/access
  - heapam_xlog.h
  - xlog.h

4 files changed

+285

-65

lines changed

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