On 11/08/2003 09:59 Serge Dorofeev wrote:
Hi PostrgeSQL team,
My PostrgeSQL installed as part of CYGWIN (Windows XP).
I have compared performance PostrgeSQL to MS SQL (I used a little Java
program with number of inserts in table).
MS SQL is faster in 12 times :-(
It's very strange results.
Guys who developed this server: what you can tell in this - what
customizations needs to increase of productivity?
How to force PostgreeSQL to work faster?
Speed (inserts/sec) Elapsed time (ms)
MS SQL (Average): 295 39 869
testInsert 5000
263 18 977
255 19 619
306 16 334
testInsert 1
315 31 716
324 30 905
319 31 325
testInsert 2
241 82 919
313 63 922
317 63 101
PostrgreSQL (Average): 24 520 160
testInsert 5000
26 191 434
26 191 264
26 192 295
testInsert 1
22 463 669
25 393 510
24 409 528
testInsert 2
24 834 911
17 1 184 613
24 820 218
MS SQL is faster (times): 12 13
You don't give any details about your test code or how the databases are
configured so I'm guessing that you're inserts use an autocommitting
connection. For PostgreSQL, this causes each insert to be run inside a
tranaction and the transaction is then immediately written to disk. My
guess is that MS SQL behaves differently and doesn't immediately write to
disk (faster maybe but could cause data corruption). Try modifying your
program to have connection.setAutoCommit(false) and do a
connection.commit() after say every 100 inserts.
HTH
--
Paul Thomas
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