Dear Friends,
Back to work after long time, was busy in trekking. Today we did database migration from 9i to 10g using Export / Import.
To upgrade a database using the Export/Import utilities kindly follow below mention steps.
- Keep database in restricted mode – Export data from the current database
exp FILE=exp_20092011.dmp FULL=y GRANTS=y BUFFER=4096 ROWS=y CONSISTENT=y
- Now once export is done prerequisite for import :
1) Please verify for sysaux tablespace is available. And also the 10g parameter properly set.
2)Please create the required Users and Tablespace as per the requirement.
Query yo check User with respective privilages.
select
lpad(‘ ‘, 2*level) || granted_role “User, his roles and privileges”
from
(
/* THE USERS */
select
null grantee,
username granted_role
from
dba_users
where
username like upper(‘%&enter_username%’)
/* THE ROLES TO ROLES RELATIONS */
union
select
grantee,
granted_role
from
dba_role_privs
/* THE ROLES TO PRIVILEGE RELATIONS */
union
select
grantee,
privilege
from
dba_sys_privs
)
start with grantee is null
connect by grantee = prior granted_role;
Query to check Tablespaces and there sizes.
set line 120
col host_name for a20;
select w.name,Q.host_name,a.tablespace_name,round(b.total_mb/1024/1024,2) total_mb,
round(x.maxbytes_mb/1024/1024,2) maxbytes_mb,
round(nvl(c.used_mb/1024/1024,0),2) Used_Mb,
round(nvl(d.free_mb/1024/1024,0),2) Free_mb,
round(((nvl(Used_mb,1)/decode(maxbytes_mb,NULL,total_mb,0,total_mb,maxbytes_mb))*100),2) Used_percent
from dba_tablespaces a, (select tablespace_name,bytes Total_Mb from sys.sm$ts_avail) b,
(select tablespace_name,bytes Used_mb from sys.sm$ts_used) c,
(select tablespace_name,bytes free_mb from sys.sm$ts_free) d, v$database w, v$instance Q,
(select tablespace_name,sum(maxbytes) maxbytes_mb from dba_data_files group by tablespace_name) x
where a.tablespace_name=b.tablespace_name(+)
and a.tablespace_name=c.tablespace_name(+)
and a.tablespace_name=x.tablespace_name(+)
and a.tablespace_name=d.tablespace_name(+) order by 8 desc;
You can get the DDL of tablespace using below script.
set pagesize 0
set escape on
spool ‘\tablespace.sql’
select ‘create tablespace ‘ || df.tablespace_name || chr(10)
|| ‘ datafile ”’ || df.file_name || ”’ size ‘ || df.bytes
|| decode(autoextensible,’N’,null, chr(10) || ‘ autoextend on maxsize ‘
|| maxbytes)
|| chr(10)
|| ‘default storage ( initial ‘ || initial_extent
|| decode (next_extent, null, null, ‘ next ‘ || next_extent )
|| ‘ minextents ‘ || min_extents
|| ‘ maxextents ‘ || decode(max_extents,’2147483645′,’unlimited’,max_extents)
|| ‘) ;’
from dba_data_files df, dba_tablespaces t
where df.tablespace_name=t.tablespace_name;
set pagesize 100
set escape off
spool off
You can get the DDL of Users using below script.
set pagesize 0
set escape on
spool users.sql
select ‘create user ‘ || U.username || ‘ identified ‘ ||
DECODE(password,
NULL, ‘EXTERNALLY’,
‘ by values ‘ || ”” || password || ””
)
|| chr(10) ||
‘default tablespace ‘ || default_tablespace || chr(10) ||
‘temporary tablespace ‘ || temporary_Tablespace || chr(10) ||
‘ profile ‘ || profile || chr(10) ||
‘quota ‘ ||
decode ( Q.max_bytes, -1, ‘UNLIMITED’, NULL, ‘UNLIMITED’, Q.max_bytes) ||
‘ on ‘ || default_tablespace ||
decode (account_status,’LOCKED’, ‘ account lock’,
‘EXPIRED’, ‘ password expire’,
‘EXPIRED \& LOCKED’, ‘ account lock password expire’,
null)
||
‘;’
from dba_users U, dba_ts_quotas Q
— Comment this clause out to include system & default users
where U.username not in (‘SYS’,’SYSTEM’,
‘SCOTT’,’DBSNMP’,’OUTLN’,’WKPROXY’,’WMSYS’,’ORDSYS’,’ORDPLUGINS’,’MDSYS’,
‘CTXSYS’,’XDB’,’ANONYMOUS’,’OWNER’,’WKSYS’,’ODM_MTR’,’ODM’,’OLAPSYS’,
‘HR’,’OE’,’PM’,’SH’,’QS_ADM’,’QS’,’QS_WS’,’QS_ES’,’QS_OS’,’QS_CBADM’,
‘QS_CB’,’QS_CS’,’PERFSTAT’)
and U.username=Q.username(+) and U.default_tablespace=Q.tablespace_name(+)
;
set pagesize 100
set escape off
spool off
Now run this tablespace.sql and users.sql to create tablespace and users in 10g.
[Note : Actually we need not create user and tablespace while importing DB in 10g]
3)Make sure that 10g DB is in Non-Archive log mode.
imp FILE=exp_20092011.dmp LOG=imp_20092011.log FULL=Y GRANTS=Y BUFFER=4096 ROWS=Y
- Once import is done please follow the below steps:
1)Once import is done please Check import logs for errors.
2)Make sure users are pointing to proper tablespaces.
select USERNAME,ACCOUNT_STATUS,DEFAULT_TABLESPACE,TEMPORARY_TABLESPACE from dba_users;
3)Please check the total object count and respective schema object count and confirm with original.
select OBJECT_TYPE,count(*)from dba_objects where owner=’CROSSLNK’ group by OBJECT_TYPE;
4)Please check the roles and privilages for respective user and do the required changes for same if required..
select
lpad(‘ ‘, 2*level) || granted_role “User, his roles and privileges”
from
(
/* THE USERS */
select
null grantee,
username granted_role
from
dba_users
where
username like upper(‘%&enter_username%’)
/* THE ROLES TO ROLES RELATIONS */
union
select
grantee,
granted_role
from
dba_role_privs
/* THE ROLES TO PRIVILEGE RELATIONS */
union
select
grantee,
privilege
from
dba_sys_privs
)
start with grantee is null
connect by grantee = prior granted_role;
5)Please check the invalid object count.Recompile for invalid objects (run utrp.sql)
select count(*) from dba_objects where STATUS=’INVALID’;
6)Gather statistics for entire database
DATABASE LEVEL
begin
dbms_stats.gather_database_stats(
options=> ‘GATHER AUTO’);
end;
7) Put the 10g DB back into ARCHIVELOG mode if required.
SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup mount
ORACLE instance started.
Total System Global Area 272629760 bytes
Fixed Size 788472 bytes
Variable Size 103806984 bytes
Database Buffers 167772160 bytes
Redo Buffers 262144 bytes
Database mounted.
SQL> alter database archivelog;
Database altered.
SQL> alter database open;
Database altered.
8) Verify the backup is configured properly.
9)Monitor the alert log and dump directories for possible issues.
I Hope this article helped to you. I am expecting your suggestions/feedback.
It will help to motivate me to write more articles….!!!!
Thanks & Regards,
Samadhan
https://samadhandba.wordpress.com/
“Key for suceess, always fight even knowing your defeat is certain….!!!!”
samadhandba 