Export/Import

Refreshing schemas in oracle Databases

Hi,
Schema refresh task might be regular for DBA's working on Database migration project.Schema refresh is done to make our production Database data in sync with developmnent,test and performance environment.

Below I'm describing one such task.Lot of time we might need to do a set of schemas so it is very important we make a document or plan for doing this task effectively.In the below task we have 2 environments .PRODDB(production) and TESTDB(test).I'm refreshing TESTDB by taking Data from PRODB,here only one schema is refreshed.

Source side:


Preparatory Steps:

Create directory or use an exiting directory by giving read and write permission for 'system' Database user to use that direcotry(TEST_MIG).

SQL> grant read,write on directory TEST_MIG to system;

Grant succeeded.

SQL> alter user system identified by TESTDBdba account unlock;

PRODDB:

Step 1:Exporting the Data from the source Database(PRODDB in our case)

vi expdp_refresh_schema_sep27.sh

$ expdp system/PRODDB@PRODDB DUMPFILE=REFRESH_SCHEMA.DMP DIRECTORY=DATA_PUMP_DIR SCHEMAS=REFRESH_SCHEMA LOGFILE=REFRESH_SCHEMA.log

$ nohup sh expdp_refresh_schema_sep27.sh>refresh_schema.out &

Step 2:Copying the dump file(Source Data) to Target Database server
We can use 'winscp' tool(A graphical utility for copying files from windows to linux or viceversa) or ftp or scp or tar or rsync for coping Data from source server to target server.

Step 3:Moving Data into the target Database.

$ impdp system/TESTDBdba@TESTDB DUMPFILE=REFRESH_SCHEMA.DMP DIRECTORY=TEST_MIG REMAP_SCHEMA=REFRESH_SCHEMA:REFRESH_SCHEMA LOGFILE=REFRESH_SCHEMA.log


Step 4:Verify the Data in Source and Target Databases.

Note:
In oracle 11g rel2,version:11.2.0.1.0 there are about 44 Distinct object_types comparing to previous versions this number is huge.

SQL> select *from v$version;

BANNER
--------------------------------------------------------------------------------
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
PL/SQL Release 11.2.0.1.0 - Production
CORE 11.2.0.1.0 Production
TNS for Linux: Version 11.2.0.1.0 - Production
NLSRTL Version 11.2.0.1.0 - Production


SQL> select distinct object_type from dba_objects;

OBJECT_TYPE
-------------------
EDITION
INDEX PARTITION
CONSUMER GROUP
SEQUENCE
TABLE PARTITION
SCHEDULE
QUEUE
RULE
JAVA DATA
PROCEDURE
OPERATOR

OBJECT_TYPE
-------------------
LOB PARTITION
DESTINATION
WINDOW
SCHEDULER GROUP
DATABASE LINK
LOB
PACKAGE
PACKAGE BODY
LIBRARY
PROGRAM
RULE SET

OBJECT_TYPE
-------------------
CONTEXT
TYPE BODY
JAVA RESOURCE
XML SCHEMA
TRIGGER
JOB CLASS
UNDEFINED
DIRECTORY
MATERIALIZED VIEW
TABLE
INDEX

OBJECT_TYPE
-------------------
SYNONYM
VIEW
FUNCTION
JAVA CLASS
JAVA SOURCE
INDEXTYPE
CLUSTER
TYPE
RESOURCE PLAN
JOB
EVALUATION CONTEXT

44 rows selected.

Source Database:

PRODDB:
---------

SQL> select count(*) from dba_objects
where owner='REFRESH_SCHEMA';

COUNT(*)
----------
132

SQL> select count(*) from dba_tables
where owner='REFRESH_SCHEMA';

COUNT(*)
----------
34

SELECT COUNT(*) FROM DBA_OBJECTS
WHERE OWNER='REFRESH_SCHEMA'
AND OBJECT_TYPE IN('TABLE','JOB','VIEW','PACKAGE','TRIGGER','SYNONYM','FUNCTION','PROCEDURE','TYPE')
ORDER BY OBJECT_TYPE;
SQL> SELECT COUNT(*) FROM DBA_OBJECTS
WHERE OWNER='REFRESH_SCHEMA'
AND OBJECT_TYPE IN('TABLE','JOB','VIEW','PACKAGE','TRIGGER','SYNONYM','FUNCTION','PROCEDURE','TYPE')
ORDER BY OBJECT_TYPE;
2 3 4
COUNT(*)
----------
62


SELECT COUNT(*) FROM DBA_OBJECTS
WHERE OWNER='REFRESH_SCHEMA'
AND OBJECT_TYPE IN


TARGET DATABASE:


TESTDB:
-------------
SQL> select count(*) from dba_objects
where owner='REFRESH_SCHE'; 2

COUNT(*)
----------
131

SQL> select count(*) from dba_tables
where owner='APEX4_DEV'; 2

COUNT(*)
----------
34

SQL> SELECT COUNT(*) FROM DBA_OBJECTS
WHERE OWNER='REFRESH_SCHEMA'
AND OBJECT_TYPE IN('TABLE','JOB','VIEW','PACKAGE','TRIGGER','SYNONYM','FUNCTION','PROCEDURE','TYPE')
ORDER BY OBJECT_TYPE;

COUNT(*)
----------
62

Regards
Goraknath