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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2012-03-31 14:42:33 -0400 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2012-03-31 14:42:33 -0400 |
| commit | 80c40f07eb31aa70d245a25b4a5b9ad1d010c431 (patch) | |
| tree | 4c40d9c85b2e779a4a5fbbe9aca2e5bd95d99ade /src/bin/pg_dump/common.c | |
| parent | 19ab40fd468b78ef8e6e4e9db6e515d2232faefc (diff) | |
Fix O(N^2) behavior in pg_dump for large numbers of owned sequences.
The loop that matched owned sequences to their owning tables required time
proportional to number of owned sequences times number of tables; although
this work was only expended in selective-dump situations, which is probably
why the issue wasn't recognized long since. Refactor slightly so that we
can perform this work after the index array for findTableByOid has been
set up, reducing the time to O(M log N).
Per gripe from Mike Roest. Since this is a longstanding performance bug,
backpatch to all supported versions.
Diffstat (limited to 'src/bin/pg_dump/common.c')
| -rw-r--r-- | src/bin/pg_dump/common.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/src/bin/pg_dump/common.c b/src/bin/pg_dump/common.c index fd8709f1d59..04379e39c44 100644 --- a/src/bin/pg_dump/common.c +++ b/src/bin/pg_dump/common.c @@ -124,6 +124,9 @@ getSchemaData(int *numTablesPtr) tblinfo = getTables(&numTables); tblinfoindex = buildIndexArray(tblinfo, numTables, sizeof(TableInfo)); + /* Do this after we've built tblinfoindex */ + getOwnedSeqs(tblinfo, numTables); + if (g_verbose) write_msg(NULL, "reading user-defined functions\n"); funinfo = getFuncs(&numFuncs); |