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| author | Tom Lane <tgl@sss.pgh.pa.us> | 1999-10-30 17:27:15 +0000 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 1999-10-30 17:27:15 +0000 |
| commit | cf627ab41ab9f6038a29ddd04dd0ff0ccdca714e (patch) | |
| tree | 3665dba2300a7ce8bd246a5e8c1db523007993be /src/backend/executor/nodeAppend.c | |
| parent | 2a5f3869a233daf271669b70dc83a7ffea37d176 (diff) | |
| download | postgresql-cf627ab41ab9f6038a29ddd04dd0ff0ccdca714e.tar.gz postgresql-cf627ab41ab9f6038a29ddd04dd0ff0ccdca714e.zip | |
Further performance improvements in sorting: reduce number of comparisons
during initial run formation by keeping both current run and next-run
tuples in the same heap (yup, Knuth is smarter than I am). And, during
merge passes, make use of available sort memory to load multiple tuples
from any one input 'tape' at a time, thereby improving locality of
access to the temp file.
Diffstat (limited to 'src/backend/executor/nodeAppend.c')
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