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 m���m
>>> [EMAIL PROTECTED] 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 m���m
>>> [EMAIL PROTECTED] 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:
1. From your "real" export experience, how much performance boost did you
see when you set "direct=y"?
2. If "direct=y" improves the performance, why would anyone want to use
"direct=n"?
Thanks.
Guang
-- here is my orcle dump file's time stamp:
(dmp.1 and dmp.2 are from direct=y,
dmp.3, dmp.4 and dmp.5 are from direct=n).
-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)
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