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11.23.2004 at 03:11PM PST, ID: 21218146
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7.6

PostgreSQL performance -- VERY slow on INSERTing into tables without indexes in a small db

Asked by GomerJones in PostgreSQL Database

Tags: , , ,

I have installed the latest PostgreSQL native Windows beta (8.0.0-beta4 using the Windows MSI installer) on a Windows XP Pro SP2 system.  I accepted all of the installation defaults, as far as I remember.  It is running successfully (I can store from my app, "pgAdmin III" shows the results, I can query using "psql")  and my application that stores data via ODBC (psqlodbc.dll, version 8.0.0.2) is working.  But it is VERY slow to store.  A single INSERT takes an elapsed time of one second according to the query log, although the actiual query time is only 10 milliseconds (typically).  The tables being inserted into have no indexes.  The disk drive buzzes without stop as many INSERT's are done.   It does not matter whether they are Prepared or Direct INSERT's.  I have increased most of the configuration parameters in file "postgresql.conf" that relate to memory and buffer sizes to large numbers (see below), but nothing changes.  I have been sure to re-start the server each time so that the new conf parameters should take effect.  My app is explicitly beginning and committing transactions, one transaction over many INSERT's.  The size of "C:\Program Files\PostgreSQL\8.0.0-beta4\data\base" is 44 Mb.  My computer has 512 MB of RAM.

Why is it so slow?  Why all the disk activity?  How can I speed it up?  I am not asking for real performance tuning.  I just want to fix what is "broken".

customized Parameters:
shared_buffers = 8000
work_mem = 10240
bgwriter_percent = 0
bgwriter_maxpages = 0
fsync = false
wal_buffers = 1000
checkpoint_timeout = 3600
checkpoint_warning = 0

log_min_error_statement = debug
log_min_duration_statement = 0

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About this solution

Zone: PostgreSQL Database
Tags: postgresql, slow, performance, insert
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Solution Provided By: earthman2
Participating Experts: 5
Solution Grade: B
 
 
[+][-]11.24.2004 at 07:06AM PST, ID: 12666041

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