RE: Insert performance problem

Following is the trace and it is doing sequential read on both table
from which to read and to write.
 
Elapsed times include waiting on following events:
 
  Event waited on                             Times   Max. Wait  Total
Waited Waited 
 
  db file sequential read                     13910       0.46
71.20
  undo segment extension                  3260        0.00          0.00
  buffer busy waits                             147          0.00
0.00
  log file sync                                     43           0.00
0.06
  log buffer space                               13           0.00
0.00
  log file switch completion                   2           0.07
0.13
 
If I modify the query and try to insert 1M records at same time instead
of 1000, trace changes like this:
 
Elapsed times include waiting on following events:
 
  Event waited on                             Times   Max. Wait  Total
Waited  Waited  
  db file sequential read                       804        0.47
11.79
  db file scattered read                        885        0.55
37.44
  undo segment extension                        425        0.00
0.00
  buffer busy waits                              30        0.00
0.00
  log buffer space                               54        0.53
0.64
  log file switch completion                      2        0.06
0.10
  log file sync                                   3        0.00
0.00
  latch: cache buffers lru chain                  1        0.00
0.00
 
Thanks
--Harvinder
 
________________________________

From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of
Jared.Still@xxxxxxxxxxx
Sent: Thursday, June 17, 2004 4:16 PM
To: oracle-l@xxxxxxxxxxxxx
Subject: Re: Insert performance problem
 

Run a 10046 level 8 trace and see where the time is spent. 



"Harvinder Singh" <Harvinder.Singh@xxxxxxxxxxxxx> 
Sent by: oracle-l-bounce@xxxxxxxxxxxxx 
06/17/2004 12:23 PM 
Please respond to
oracle-l@xxxxxxxxxxxxx
To
<oracle-l@xxxxxxxxxxxxx> 
cc
 
Subject
Insert performance problem
 
 
 



Hi, 
  
We are testing a application prototype and inserting 1000 rows from 1
table and populating into 2nd table in a loop and inserting 1M rows. 
2nd table have primary key on 2 column, 1 column unique key and 1
non-unique index on 6 columns 
We are seeing tps of only about 5000 whereas if I run same test on sql
server tps is between 15000 to 20000 
  
Following are the stats on the machine: 
Oracle 10g on win2k 
Writing to hard disk having all the datafiles(raid 5) :Avg disk
bytes/write   9000 and 13000 
Writing to hard disk having log files                 :Avg disk
bytes/write   48000 and 70000 
  
  

Other related posts: