Schema/Object refresh is one of the routine tasks in DBA's life, moving objects from one schema to another schema in same database or another. Generally, we use expdp/impdp or traditional export/import methods for refresh, but Here I am explaining with datapump utility because compare to normal traditional export/import method, datapump is much faster and it having several features and options like we can stop and resume in the middle of task, parallelism to improve performance like many etc...
Below I have explained completed procedure
of schema refresh step by step.
Oracle Data Pump is introduced from oracle 10g, Oracle Data Pump enables very high-speed movement of data and metadata from one database to another database. Before performing the schema refresh check whether that user having EXP_FULL_DATABASE role or not.
Follow
below steps in source and target database sides:
Source Database Side:
Step-1:
Check whether the schema exist or not, schema must be resides in source database.
SQL> select username, account_status, created from dba_users where username='ORACLE';
Step-2:
Check the schema size
SQL> select owner, sum(bytes)/1024/1024 “MB” from dba_segments where owner="ORACLE";
Step-3:
Take the count of schema objects, this will be use full after complete the refresh to compare both target and source schema objects.
SQL> select object type, count(*) from dba_objetcts where owner='ORACLE' group by object_type;
Step-4:
Before going to take the export, first check mount point size where you’re going to store the export dumpfile, if mount point doesn't have sufficient space export job gets fail.
example:
]$ cd /d01/exports
exports] $ df -h . (in Linux) df -g . (AIX and Sun Solaris)
Step-5:
Create a datapump directory in database level, default datapump directory location is " /app/oracle/product/10.2.0/rdbms/log/".
First create a directory in OS Level
]$ mkdir -p /d01/exports
Next create in database level
SQL> create or replace directory DATAPUMP as '/d01/exports';
Step-6:
Now take the export of schema.
]$ expdp \'/ AS SYSDBA\' directory=DATA_PUMP_DIR dumpfile= ORACLE_DBNAME.dmp logfile= ORACLE_DBNAME.log schemas=ORACLE
Step-7:
If you're going to import on same server means no need to move the dumpfile anywhere, incase if you're going to import this dump file in some other server, copy this dumpfile through SCP command
expdp]$ scp -p username@servername:\do1\targetlocation (It will ask you target server password )
Completed almost all steps in source database end, now move to target database side.
Target Database:
Step-1:
Check the mount pint size, it should be more then schema size.
]$ cd /d01/exports
exports]$ df -h . (in Linux) df -g . (AIX and Sun Solaris)
Step-2:
Create a directory same like how we have create for source database.
First create a directory in OS Level
]$ mkdir -p /d01/exports
Next create directory at database levele
SQL> create or replace directory DATAPUMP as '/d01/exports';
Step-3:
Take target schema backup before importing.(for safe side). with export command.
]$ expdp \'/ AS SYSDBA\' directory=DATAPUMP dumpfile= ORACLE_DBNAME.dmp logfile= ORACLE_DBNAME.log schemas=ORACLE
Step-4:
SCRIPTS: Find complete list of objects in the schema
Use
this script when you do not need to drop the schema, But only the dependent
objects in the schema. For ex :- to preserve DB-links, grants, privileges
Below
scripts will generate all of the drop statements needed to drop almost all
objects (sometimes 1-2 of them will have problems and you will have to manually
drop those) from a specified schema (it prompts you for the schema).
EXECUTION
Login
to the database where the schema to be dropped exists. Copy and paste the
following script , double checking that you are in the correct database!:
--Initializations
set linesize 1000;
SET VERIFY OFF
col owner format a15;
col object_name format a30;
col object_type format a20;
--Select Non-system object owners
SELECT OWNER,OBJECT_TYPE,COUNT(*)
FROM SYS.DBA_OBJECTS
WHERE OWNER NOT IN ('SYS','SYSTEM','TSMSYS','ORACLE_OCM','WMSYS','PATMAN','OUTLN','PUBLIC','DBSNMP','XDB','APPQOSSYS','CTXSYS')
GROUP BY OWNER,OBJECT_TYPE
ORDER BY OWNER,OBJECT_TYPE;
--Select specific Owner, Object_Type & Count
SELECT OWNER,OBJECT_TYPE,COUNT(*)
FROM SYS.DBA_OBJECTS
WHERE OWNER = '&&USER'
GROUP BY OWNER,OBJECT_TYPE
ORDER BY OWNER,OBJECT_TYPE;
--Drops: Tables, Indexes, & Triggers
SELECT 'DROP TABLE '||OWNER||'.'||OBJECT_NAME||' CASCADE CONSTRAINTS PURGE;'
FROM SYS.DBA_OBJECTS
WHERE OWNER = '&&USER'
AND OBJECT_TYPE IN ('TABLE');
--Drops: Sequences, Views, Packages, Functions & Procedures, Synonyms
SELECT 'DROP '|| OBJECT_TYPE || ' ' ||OWNER||'.'||OBJECT_NAME||';'
FROM SYS.DBA_OBJECTS
WHERE OWNER = '&&USER'
AND OBJECT_TYPE IN ('PACKAGE','SEQUENCE','VIEW','FUNCTION','PROCEDURE','SYNONYM','TRIGGER');
--Drops: Types
SELECT 'DROP '|| OBJECT_TYPE || ' ' ||OWNER||'.'||OBJECT_NAME||' FORCE;'
FROM SYS.DBA_OBJECTS
WHERE OWNER = '&&USER'
AND OBJECT_TYPE IN ('TYPE');
--DO NOT DROP OR IMPORT DBLINKS, EXCLUDE=DATABASE_LINK
SELECT OWNER, OBJECT_TYPE, COUNT(*)
FROM SYS.DBA_OBJECTS
WHERE OWNER = '&&USER'
AND OBJECT_TYPE IN ('DATABASE LINK')
GROUP BY OWNER, OBJECT_TYPE;
OR
Drop the Schema at destination database:
SQL> Drop Schema <schema_name> cascade;
(Better drop only schema objects instead of dropping schema)
Step-5:
Import the dumpfile into target schema
impdp \'/ AS SYSDBA\' directory=DATAPUMP dumpfile=ORACLE_DATABASE.dmp logfile=ORACLE_DATABASE.log schemas=ORACLE
Step-6:
Compare the Object Count with source database.
SQL> select object_type, count(*) from dba_objetcts where owner='ORACLE' group by object_type;
(If all the objects same and looks good go ahead and run utlrp.sql.)
Step-7:
Check invalid objects count if any.
SQL> select owner, object_type, status, count(*)
from sys.dba_objects
where status = ‘INVALID’
group by owner, object_type, status
order by owner, object_type, status;
SQL> @?/rdbms/admin/utlrp.sql
