Performanc issue

Question

hey to all
i have face a problem regarding performance ADDM report show problem with tempoary tablespace. loading of data take double time. what can i do whereas loading of data is running
*Action Consider increasing the throughput of the I/O subsystem. Oracle's recommended solution is to stripe all data file using the SAME methodology. You might also need to increase the number of disks for better performance. Alternatively, consider using Oracle's Automatic Storage Management solution.
Rationale During the analysis period, the average data files' I/O throughput was 8 M per second for reads and 2.9 M per second for writes. The average response time for single block reads was 3.2 milliseconds*
Action The performance of file F:\APP\ZAFAR\ORADATA\ORCL\TEMP09.DBF was significantly worse than other files. If striping all files using the SAME methodology is not possible, consider striping this file over multiple disks.
Rationale The average response time for single block reads for this file was 803 milliseconds.
i've use Raid 5 on my server
OS window server 2003
oracle 11g

Answer 1

Oracle Studnet,
One of the suggestions offered by Jonathan is that a drive in the RAID 5 array might have failed (died/crashed/offline). When that happens, the poor write performance that existed on the RAID array becomes much, much worse as the missing data from the failed drive must be reconstructed in real-time from the distributed parity data as read requests arrive and write requests are performed. Start by looking for a failed drive in the RAID array.
After verifying that a drive has not failed, take a look at the output of the following SQL statement:
SELECT
  SUBSTR(NAME,1,30) NAME,
  SUBSTR(VALUE,1,30) VALUE
FROM
  V$PARAMETER
ORDER BY
  NAME;To help us help you, please post the output of the above SQL statement to this forum. Use { code } tags (without spaces) before and after the output to preserve the spacing.
Does your server have the 32 bit version of Windows 2003, or the 64 bit version?
How much memory is in the server?
Is the RAID 5 array internal to the server (drives are physically installed in the server), or is there an external storage system?
Is everything stored on a single RAID 5 array, or are there multiple arrays, or multiple partitions on the same RAID 5 array?
What may not be clear from a licensing standpoint is that using the features of ADDM and ASH require an additional cost license. If you are not certain that your company purchased this additional cost license, I would advise against using it further - disable those features in Enterprise Manager.
When trying to performance tune, ask yourself what has changed? Failed hard drive? Failed RAM taken offline? Installation of a virus scanner? Running other applications on the server? Virus infection? Server out of physical memory and is using the swap file excessively? Server CPU is maxed out (greater than 85% utilization)?
After checking on the above, take a look at the system wide wait events. The wait event statistics reset when the database instance is restarted, so to use the wait event statistics properly, you must check the values, wait a short period of time, and then check the statistics again, subtracting the first set of values from the second. During the load process, execute the following query:
SELECT
  EVENT,
  TOTAL_WAITS,
  TOTAL_TIMEOUTS,
  TIME_WAITED,
  AVERAGE_WAIT
FROM
  V$SYSTEM_EVENT
WHERE
  EVENT NOT IN ('Null event','pmon timer','process startup','rdbms ipc reply','rdbms ipc message','reliable message','smon timer')
  AND EVENT NOT LIKE 'SQL*Net%';Wait 10 minutes, and then execute the SQL statement a second time. Subtract the first set of values for TOTAL_WAITS, TOTAL_TIMEOUTS, and TIME_WAITED from the second and post the results here.
When checking the V$SYSTEM_EVENT view, also execute the following (at the start and end of the 10 minute time period), saving the results so the first set of VALUE values may be subtracted from the second.
SELECT
  STAT_NAME,
  VALUE
FROM
  V$OSSTAT
ORDER BY
  STAT_NAME;
SELECT
  STAT_NAME,
  VALUE
FROM
  V$SYS_TIME_MODEL
ORDER BY
  STAT_NAME;Post the results here for assistance.
Charles Hooper
IT Manager/Oracle DBA
K&M Machine-Fabricating, Inc.