mirror of
https://github.com/postgres/postgres.git
synced 2026-04-15 22:10:45 -04:00
2f2baf9299
no-longer-needed pages at the end of a table. We thought we could throw away pages containing HEAPTUPLE_DEAD tuples; but this is not so, because such tuples very likely have index entries pointing at them, and we wouldn't have removed the index entries. The problem only emerges in a somewhat unlikely race condition: the dead tuples have to have been inserted by a transaction that later aborted, and this has to have happened between VACUUM's initial scan of the page and then rechecking it for empty in count_nondeletable_pages. But that timespan will include an index-cleaning pass, so it's not all that hard to hit. This seems to explain a couple of previously unsolved bug reports. |
||
|---|---|---|
| .. | ||
| access | ||
| bootstrap | ||
| catalog | ||
| commands | ||
| executor | ||
| lib | ||
| libpq | ||
| main | ||
| nodes | ||
| optimizer | ||
| parser | ||
| po | ||
| port | ||
| postmaster | ||
| regex | ||
| rewrite | ||
| storage | ||
| tcop | ||
| utils | ||
| Makefile | ||
| nls.mk | ||