Query on Database Export and Import

Hi Techies,
Currently we are running our Database on Oracle 10g and SAP on4. and OS is HP UX 11.11.
We have a plan to migrate our HW from PA-RISC to Itanium and at the time of Production migration we are planning to use Export and Import method to get free space.
Our plan is as below:
We will not touch the original Production, Just restore the DB into new server.
And post restore we will create the space on new server equallent to our DB size.
Then will perform DB export from the new system to the null space
Then Import the DB into same system.
Here my queries are:
1) Is it possible to export and Import the Database from/to null space?
2) We have 2T size of DB, And good resources like 32G Ram, 12 CPUs etc. How much time can be expected to perform Export and Import?
3) What are the challenges we can expect?
4) Minimum how much of free space we can expect with this option?
Regards,
Nick Loy

So with test runs I can expect rapid speed in DB export and Import (1T/H)........If I have good system then Database export and Import gets complete within 2 hrs (Database size is 2T).
Well 1tb is at the very top of expectations here, you should be careful. I did an export/import of a 1.5tb database of an ERP system lately. We did parallel export (40 processes) / import (20 processes) using distmon, source was HP IA64, target Linux x64_64. The disks were midrange SAN storage systems on both sides. After tuning we managed to do in 6-7hrs.
But in your case, if you only have one system, this could mean you have to drop the source db first and then recreate the target db on the same disks. The creation of the 1-2tb database files alone can take up more than 1 hour , besides that you don't have an easy fallback.
If you have a test system that is comparable from size and hardware perspective, then i suggest you try a test export to get a feeling for it.
What about the Online re-org of database? What would be the best way to get free space within minimum downtime?
Theoretically you should be able to gain more or less the same amount of space doing online reorgs. The advantage is less downtime, the downside is the reorgs will be running over a longer time period and put additional load on the system.
Cheers Michael

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Creation Date: 18-APR-1994
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Scope and Application
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step by step

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I am having trouble with export and import
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exp "'/ as sysdba'" PARFILE=parfile.txt
PAFILE
TABLES=user1.Table1
file=Table1_1006.dmp
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set and AL16UTF16 NCHAR character set
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Current user changed to user1
. . exporting table Table1 16019049 rows exported
EXP-00091: Exporting questionable statistics.
EXP-00091: Exporting questionable statistics.
EXP-00091: Exporting questionable statistics.
EXP-00091: Exporting questionable statistics.
EXP-00091: Exporting questionable statistics.
EXP-00091: Exporting questionable statistics.
EXP-00091: Exporting questionable statistics.
EXP-00091: Exporting questionable statistics.
Export terminated successfully with warnings.Then I started importing
/database2/rdbm15> imp "'/ as sysdba'" file=Table1_1006.dmp fromuser=user1 touser=user1 tables=Table1 log=imp_Table1_1006.log
Import: Release 10.2.0.5.0 - Production on Thu Oct 6 19:57:01 2011
Copyright (c) 1982, 2007, Oracle. All rights reserved.
Connected to: Oracle Database 10g Enterprise Edition Release 10.2.0.5.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
Export file created by EXPORT:V10.02.01 via conventional path
import done in US7ASCII character set and AL16UTF16 NCHAR character set
. importing user1's objects into user1
IMP-00015: following statement failed because the object already exists:
"CREATE TABLE "Table1" ("APPROVALTRACEID" VARCHAR2(64), "REQUESTOR"
"EID" VARCHAR2(9), "EID" VARCHAR2(9), "FIRSTNAME" VARCHAR2(32), "LASTNAME" V"
"ARCHAR2(32), "MIDDLEINITIAL" VARCHAR2(8), "TIER" VARCHAR2(3), "JOBTITLE" VA"
"RCHAR2(64), "JOBCODE" VARCHAR2(10), "EMPLOYEETYPE" VARCHAR2(2), "CONTRACTOR"
"TYPE" VARCHAR2(2), "EMPLOYEESTATUS" VARCHAR2(2), "COSTCENTER" VARCHAR2(10),"
" "COSTCENTERDESCRIPTION" VARCHAR2(50), "CONTRACTENDINGDATE" VARCHAR2(8), "A"
"CCOUNTSTATUS" VARCHAR2(2), "LOGINID" VARCHAR2(70), "APPLICATIONGROUP" VARCH"
"AR2(50), "APPLICATIONNAME" VARCHAR2(50), "APPLICATIONID" VARCHAR2(12), "LEV"
"EL1" VARCHAR2(512), "LEVEL2" VARCHAR2(512), "LEVEL3" VARCHAR2(512), "LEVEL4"
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"SSEDDATE" DATE, "APPROVERMANAGEREID" VARCHAR2(9), "APPROVERMANAGERDELEGATEE"
"ID" VARCHAR2(9), "APPROVERT4MANAGEREEID" VARCHAR2(9), "APPROVERT4MANAGERDEL"
"EGATEEID" VARCHAR2(9), "APPROVERAPPOWNEREID" VARCHAR2(9), "APPROVERAPPOWNER"
"DELEGATEEID" VARCHAR2(9), "PERFORMEREID" VARCHAR2(9), "NATIONALID" VARCHAR2"
"(30), "COUNTRYCODE" VARCHAR2(9), "PASSPORTID" VARCHAR2(20), "DATEOFBIRTH" V"
"ARCHAR2(15), "CITYOFBIRTH" VARCHAR2(15), "VENDORNAME" VARCHAR2(50), "VENDOR"
"MANAGERNAME" VARCHAR2(50), "VENDORMANAGERID" VARCHAR2(9), "VENDORADDRESS1" "
"VARCHAR2(100), "VENDORADDRESS2" VARCHAR2(100), "VENDORSTATEPROVINCE" VARCHA"
"R2(15), "VENDORCOUNTRYCODE" VARCHAR2(9), "VENDORZIPPOSTALCODE" VARCHAR2(9))"
" PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 STORAGE(INITIAL 4076863488 "
"NEXT 1048576 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT) "
" LOGGING NOCOMPRESS"
Import terminated successfully with warnings.but I did not get rows to database2
[server1]database2
/database2/rdbm15> sqlplus / as sysdba
SQL*Plus: Release 10.2.0.5.0 - Production on Thu Oct 6 19:59:17 2011
Copyright (c) 1982, 2010, Oracle. All Rights Reserved.
Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.5.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
SQL> select count(*) from user1.Table1;
COUNT(*)
 0
SQL> exit
SQL> select * from v$version;
BANNER
Oracle Database 10g Enterprise Edition Release 10.2.0.5.0 - 64bi
PL/SQL Release 10.2.0.5.0 - Production
CORE 10.2.0.5.0 Production
TNS for HPUX: Version 10.2.0.5.0 - Production
NLSRTL Version 10.2.0.5.0 - ProductionEdited by: user3636719 on Oct 6, 2011 5:23 PM

user3636719 wrote:
Thanks for the reply...
Old EXP IMP doesnt have capability to append the row, since you're using 10g use datapump instead. use option TABLE_EXISTS_ACTION=APPENDso my import should be like this
imp "'/ as sysdba'" file=Table1_1006.dmp fromuser=user1 touser=user1 tables=Table1 log=imp_Table1_1006.log TABLE_EXISTS_ACTION=APPEND
Did you look up the command line syntax and control options for imp?
You should make it a habit that whenever anyone - especially a stranger on the web - gives you a bit of code or references a command or init parm or any some such, the VERY FIRST thin you should ALWAYS do is look it up for yourself and see exactly where and how it is used and what it means. That is how you grow beyond having to be spoon fed every little thing and become more self-sufficient.
If you had, you would have seen that there is no TABLE_EXISTS_ACTION option for imp and seen that it is an option for impdp. And realized that exp and imp are NOT the same thing as expdp and impdp.
=================================================
Learning how to look things up in the documentation is time well spent investing in your career. To that end, you should drop everything else you are doing and do the following:
Go to tahiti.oracle.com.
Drill down to your product and version.
BOOKMARK THAT LOCATION
Spend a few minutes just getting familiar with what is available here. Take special note of the "books" and "search" tabs. Under the "books" tab you will find the complete documentation library.
Spend a few minutes just getting familiar with what kind of documentation is available there by simply browsing the titles under the "Books" tab.
Open the Reference Manual and spend a few minutes looking through the table of contents to get familiar with what kind of information is available there.
Do the same with the SQL Reference Manual.
Do the same with the Utilities manual.
You don't have to read the above in depth. They are reference manuals. Just get familiar with what is there to be referenced. Ninety percent of the questions asked on this forum can be answered in less than 5 minutes by simply searching one of the above manuals.
Then set yourself a plan to dig deeper.
- Read a chapter a day from the Concepts Manual.
- Take a look in your alert log. One of the first things listed at startup is the initialization parms with non-default values. Read up on each one of them (listed in your alert log) in the Reference Manual.
- Take a look at your listener.ora, tnsnames.ora, and sqlnet.ora files. Go to the Network Administrators manual and read up on everything you see in those files.
- When you have finished reading the Concepts Manual, do it again.
Give a man a fish and he eats for a day. Teach a man to fish and he eats for a lifetime.
=================================

Query on Database Export and Import

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