Performance Issue on Traditional Import and Export

Question

Scenario
=====
Oracle 9i Enterprise Edition (9.2.0.8)
Windows Server 2003 (32 bit)
--- to ---
Oracle 11g Enterprise Edition (11.2.0.3)
Windows Server 2008 Standard R2 (64 bit)
Hi to all
I'm doing a upgrade from 9i to 11g and i am using native imp/exp to migrate those data.. For my 1st round of testing, I have done the following:
1) Full DB Export from 9i. exp system/<pwd>@db FULL=Y FILE=export.dmp log=export.log
Encountered warning "EXP-00091: Exporting questionable statistics." (On hindsight, I know that I need to set the characterset as per my server before exporting) Nevertheless, I proceeded on with this 8.4GB dmp file that has the warning "EXP-00091: Exporting questionable statistics." The characterset in 9i is US7ASCII. My export took 1 hour, my 9i is actually only a small 26GB.
2) Full import to 11g. My 11g is a newly created DB with characterset WE8MSWIN1252. I know that schemas and objects will be automatically created in 11g.
3) However, the problem I face is that this importing of data has been running for the past 4 hours and counting and it is still not done.
My question is:
Is it because of the difference in the characterset in the dmp file and 11g that is causing this importing to be slow? Could it be that characterset conversion is causing high overhead?
OR
Is it because I exported all the indexes from 9i and now during importing, it is taking a long time to create those indexes in 11g? Should I have export full but set index=F and create a index creation script from 9i and run it in 11g, so as to save time?
OR
Both of the above is causing the importing to keep on running? Or ??
Edited by: moslee on Nov 21, 2012 11:54 PM
Edited by: moslee on Nov 22, 2012 12:01 AM

Answer 1

Hi to all
All my tablespaces in oracle 9i database is on 4096 block_size... But I pre-created those same tablespaces in 11g and they are on 8192 block_size..
Am I right to say that it is the differences in block size that is slowing down this importing?
If so, how can I solve this problem? If I use "IGNORE=Y" in my import statement, will it help? Thanks..
I think i will follow my 9i db and create the tablespaces in 11g in 4096 block_size...
Here's the new server (11g) specs (i know this is not officially supported by oracle yet):
Win Server 2012
HP Proliant DL360p
Intel Xeon CPU @ 2GHz
8GB Ram
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Logfile
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C:\>imp system/<pwd>@dbnew full=y file=export.dmp
Import: Release 9.2.0.1.0 - Production on Thu Nov 22 11:29:08 2012
Copyright (c) 1982, 2002, Oracle Corporation. All rights reserved.
Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit
Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
Export file created by EXPORT:V09.02.00 via conventional path
Warning: the objects were exported by OEM, not by you
import done in WE8MSWIN1252 character set and AL16UTF16 NCHAR character set
IMP-00017: following statement failed with ORACLE error 29339:
"CREATE UNDO TABLESPACE "UNDOTBS" BLOCKSIZE 4096 DATAFILE 'F:\ORADATA\UNDO\"
"UNDOTBS.DBF' SIZE 5120 , 'F:\ORADATA\UNDO\UNDOTBS1.DBF' SIZE 5120 "
" EXTENT MANAGEMENT LOCAL "
IMP-00003: ORACLE error 29339 encountered
ORA-29339: tablespace block size 4096 does not match configured block sizes
IMP-00017: following statement failed with ORACLE error 29339:
"CREATE TEMPORARY TABLESPACE "TEMP" BLOCKSIZE 4096 TEMPFILE 'D:\ORADATA\TEM"
"P\TEMP.DBF' SIZE 7524 AUTOEXTEND ON NEXT 20971520 MAXSIZE 8192M EXTE"
"NT MANAGEMENT LOCAL UNIFORM SIZE 10485760"
IMP-00003: ORACLE error 29339 encountered
ORA-29339: tablespace block size 4096 does not match configured block sizes
IMP-00015: following statement failed because the object already exists:
"REVOKE "OEM_MONITOR" FROM SYSTEM"
IMP-00015: following statement failed because the object already exists:
"CREATE ROLE "HS_ADMIN_ROLE""
IMP-00015: following statement failed because the object already exists:
"REVOKE "HS_ADMIN_ROLE" FROM SYSTEM"
. importing O3's objects into O3
Edited by: moslee on Nov 22, 2012 6:45 PM
Edited by: moslee on Nov 22, 2012 7:07 PM
Edited by: moslee on Nov 22, 2012 7:13 PM
Edited by: moslee on Nov 22, 2012 7:28 PM