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Home -> Community -> Mailing Lists -> Oracle-L -> RE: exp performance question ( direct=y)
Thanks to all who helped me get a clear understanding of the direct=Y option for the
exp utility.
I feel good, it is Friday and I have learned something today.
ROR mô¿ôm
>>> cspence_at_FuelSpot.com 06/22/01 04:44PM >>>
No, direct only effects two things, the way oracle exports the data
(avoiding character conversions and buffering) and the format of the file.
The size and import speed of the export are effect only but .0001% or so.
Basically insignificant.
"Walking on water and developing software from a specification are easy if both are frozen."
Christopher R. Spence
Oracle DBA
Fuelspot
-----Original Message-----
Sent: Friday, June 22, 2001 3:01 PM
To: Multiple recipients of list ORACLE-L
I thought that DIRECT=Y was for imports only. It makes since because in the
import you are placing the data directly into the blocks with out a redo
log.
I have no idea why there was a difference in the times unless it was the
extra overhead for a command that was not used.
ROR mª¿ªm
>>> zlmei_at_hotmail.com 06/22/01 12:55PM >>>
Oracle : 8.0.5
Platform : Sun
Currently we have cron job every night (starting from 11pm) to do export. I changed the setting "direct" to "y" two days ago while leaving all other parameters unchanged, hoping to gain some performance. I am a bit surprused to find that it did not. It actually took longer to create dump file with less data to export. The whole exp process takes about 2 hours to finish. Yes, there could be lots of other unix processes running during that time. But I would still expect to see some improvement because we are doing this way for quite a while. So my questions are:
Thanks.
Guang
-rw-rw-r-- 1 mt prog 1042197132 Jun 18 01:05 oracle.dmp.5.gz -rw-rw-r-- 1 mt prog 1042375633 Jun 19 01:04 oracle.dmp.4.gz -rw-rw-r-- 1 mt prog 1042556662 Jun 20 00:25 oracle.dmp.3.gz -rw-rw-r-- 1 mt prog 1034773279 Jun 21 01:17 oracle.dmp.2.gz -rw-rw-r-- 1 mt prog 1035237986 Jun 22 01:22 oracle.dmp.1.gz
--here is the parameter file:
BUFFER = 64000
COMPRESS = Y
CONSISTENT = N
CONSTRAINTS = Y
DIRECT = Y
FILE = /oracle/exports/oracle.dmp.pipe
#FULL = Y
GRANTS = Y
INDEXES = Y
LOG = /oracle/exports/export.log
ROWS = Y
USERID = xxx/yyy
OWNER = (aaa,bbb)
-- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Guang Mei INET: zlmei_at_hotmail.com Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists -------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-LReceived on Fri Jun 22 2001 - 14:57:32 CDT
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also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Christopher Spence INET: cspence_at_FuelSpot.com Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists -------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L
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also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Ron Rogers INET: RROGERS_at_galottery.org Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists -------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L
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