Hi all,
I'm running the same database on two systems:
A) Debian PostgreSQL 7.4.7 B) SuSE PostgreSQL 7.3.4
Both machines have approx. 1GHz and 1GB RAM. The amount of data is almost equal (+- 10%). But I'm facing huge performance differences. For instance, a simple sequential scan results in the following query plans:
explain analyze select * from veranstaltung_original order by semester;
A) ------------------------------------------------------------
Sort (cost=734.74..747.77 rows=5210 width=232) (actual time=89.935..92.730 rows=5210 loops=1)
Sort Key: semester
-> Seq Scan on veranstaltung_original (cost=0.00..413.10 rows=5210 width=232) (actual time=0.011..7.852 rows=5210 loops=1)
Total runtime: 96.900 ms
B) ------------------------------------------------------------
Sort (cost=3054.08..3067.74 rows=5467 width=223) (actual time=2568.10..2573.02 rows=5467 loops=1)
Sort Key: semester
-> Seq Scan on veranstaltung_original (cost=0.00..2714.67 rows=5467 width=223) (actual time=1936.68..2506.83 rows=5467 loops=1)
Total runtime: 2579.08 msec
------------------------------------------------------------
Could this be due to the different PostgreSQL versions? Is there a typical cause for such performance problems? How can I find out what's wrong with installation (B)?
Thanks in advance!
-- Andreas
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