Oracle Doc link
Oracle Document
http://www.oracle.com/pls/db102/homepage
http://www.oracle.com/pls/db112/homepage
Thursday, 5 May 2011
Oracle Database release dates
Oracle release dates
Release Release Date
======= ============
Oracle 6 1988
Oracle 7 1992
Oracle 8 1997
Oracle 8i 1998
Oracle 9i 2001
Oracle 10g 2004
Oracle 11g 2007
Release Release Date
======= ============
Oracle 6 1988
Oracle 7 1992
Oracle 8 1997
Oracle 8i 1998
Oracle 9i 2001
Oracle 10g 2004
Oracle 11g 2007
Wednesday, 4 May 2011
Oracle switch logfile in standby
switch logfile in standby
Oracle switch logfile in standby
Oracle switch logfile
Parameter ARCHIVE_LAG_TARGET tells Oracle to switch a log every "N" seconds.
ALTER SYSTEM SET ARCHIVE_LAG_TARGET = 600 SCOPE=BOTH; ---- this set to 10 min
There is no need for this ALTER SYSTEM SWITCH LOGFILE; Oracle does it for you.
But I am still using Cron because we are monitoring this through Nagios
5,20,35,50 0,2-23 * * 0-6 /opt/oracle/admin/cccdb/scripts/switch_log.sh > /dev/null 2>&1
SYS AS SYSDBA>!cat /opt/oracle/admin/cccdb/scripts/switch_log.sh
#!/bin/bash
ORACLE_HOME=/opt/oracle/product/11.2; export ORACLE_HOME
ORACLE_SID=cccdb; export ORACLE_SID
PATH=/usr/bin:/usr/sbin:/usr/local/bin:$ORACLE_HOME/bin:$ORACLE_HOME/jdk:$ORACLE_HOME/perl5:$PATH; export PATH
sqlplus -s / <alter system archive log current;
alter system checkpoint;
!
logsw=$?
if [[ logsw -ne 0 ]]
then
echo "Log Switch Failed"
exit 1
else
echo "Log Switch Successful"
exit 0
fi
Oracle switch logfile in standby
Oracle switch logfile
Parameter ARCHIVE_LAG_TARGET tells Oracle to switch a log every "N" seconds.
ALTER SYSTEM SET ARCHIVE_LAG_TARGET = 600 SCOPE=BOTH; ---- this set to 10 min
There is no need for this ALTER SYSTEM SWITCH LOGFILE; Oracle does it for you.
But I am still using Cron because we are monitoring this through Nagios
5,20,35,50 0,2-23 * * 0-6 /opt/oracle/admin/cccdb/scripts/switch_log.sh > /dev/null 2>&1
SYS AS SYSDBA>!cat /opt/oracle/admin/cccdb/scripts/switch_log.sh
#!/bin/bash
ORACLE_HOME=/opt/oracle/product/11.2; export ORACLE_HOME
ORACLE_SID=cccdb; export ORACLE_SID
PATH=/usr/bin:/usr/sbin:/usr/local/bin:$ORACLE_HOME/bin:$ORACLE_HOME/jdk:$ORACLE_HOME/perl5:$PATH; export PATH
sqlplus -s / <alter system archive log current;
alter system checkpoint;
!
logsw=$?
if [[ logsw -ne 0 ]]
then
echo "Log Switch Failed"
exit 1
else
echo "Log Switch Successful"
exit 0
fi
Tuesday, 3 May 2011
Oracle Datafiles Disk I/O
Datafiles Disk IO
set pagesize 100
set linesize 200
col PERC_READS format a10
col name format a40
col PERC_WRITES like PERC_READS
SELECT df.NAME, phyrds Physical_READS,
ROUND((RATIO_TO_REPORT(phyrds) OVER ())*100, 2)|| '%' PERC_READS,
phywrts Physical_WRITES,
ROUND((RATIO_TO_REPORT(phywrts) OVER ())*100, 2)|| '%' PERC_WRITES,
phyrds + phywrts total
FROM v$datafile df, v$filestat fs, ts$ t
WHERE df.FILE# = fs.FILE#
AND df.ts# = t.ts#
-- AND t.NAME = ' xxxx '
ORDER BY phyrds DESC;
set pagesize 100
set linesize 200
col PERC_READS format a10
col name format a40
col PERC_WRITES like PERC_READS
SELECT df.NAME, phyrds Physical_READS,
ROUND((RATIO_TO_REPORT(phyrds) OVER ())*100, 2)|| '%' PERC_READS,
phywrts Physical_WRITES,
ROUND((RATIO_TO_REPORT(phywrts) OVER ())*100, 2)|| '%' PERC_WRITES,
phyrds + phywrts total
FROM v$datafile df, v$filestat fs, ts$ t
WHERE df.FILE# = fs.FILE#
AND df.ts# = t.ts#
-- AND t.NAME = ' xxxx '
ORDER BY phyrds DESC;
Who is using TEMP tablespace?
SQL Running out of Temporary tablespace
TEMP tablespace currently using
1.
set linesize 200
col sid format a12
col sql_text format a50
select s.sid || ',' || s.serial# sid,s.username,u.tablespace,
substr(a.sql_text, 1, (instr(a.sql_text, ' ')-1)) sql_text,
round(((u.blocks*p.value)/1024/1024),2) size_mb,s.sql_id
from v$sort_usage u, v$session s, v$sqlarea a,v$parameter p
where s.saddr = u.session_addr
and a.address (+) = s.sql_address
and a.hash_value (+) = s.sql_hash_value
and p.name = 'db_block_size'
group by s.sid || ',' || s.serial#, s.username,
substr(a.sql_text, 1, (instr (a.sql_text, ' ')-1)),u.tablespace,round(((u.blocks*p.value)/1024/1024),2),s.sql_id;
2
select
s.INST_ID node,
segfile#,
round(sum (((u.blocks*par.value)/1024/1024)),2) size_mb,s.sql_id
from
gv$sort_usage u,
gv$session s,
gv$process p,
v$parameter par
where
s.inst_id=u.inst_id AND
s.saddr = u.session_addr AND
s.paddr = p.addr AND
par.name='db_block_size'
group by
s.INST_ID,
segfile#,s.sql_id
order by 1,2
;
3.
set linesize 140
set pagesize 400
set head on
col iid for 990
col sid_serial for a11
column username format a10
col module for a13
col action for a15
col state for a10
column segfile# format 9,999 heading 'File|ID'
col orapid for 999999 Heading "orapid||Oracle|pid"
col dbpid for a6 HEADING "spid|Unix|pid"
col apppid for a10;
column program format a55
column segblk# format 999,999,999 heading 'Block|ID'
set timi off;
CLEAR COMPUTES;
break on iid
select distinct
s.INST_ID iid,
lpad(s.sid,5)||','|| Lpad(s.serial#,5) sid_serial,
p.pid orapid,
p.spid dbpid,
s.USERNAME,
round(sum (((u.blocks*par.value)/1024/1024)),2) size_mb,
s.status,
s.state,
u.SQL_ID,
segfile#,
s.module,
s.action
from
gv$sort_usage u,
gv$session s,
gv$process p,
v$parameter par
where
s.inst_id=u.inst_id AND
s.saddr = u.session_addr AND
s.paddr = p.addr AND
par.name='db_block_size'
group by
s.INST_ID,
lpad(s.sid,5)||','|| Lpad(s.serial#,5),
p.pid,
p.spid,
s.USERNAME,
s.status,
s.state,
u.SQL_ID,
segfile#,
s.module,
s.action
order by 1,2
;
4
SELECT S.sid || ',' || S.serial# sid_serial, S.username,
T.blocks * TBS.block_size / 1024 / 1024 mb_used, T.tablespace,
T.sqladdr address, Q.hash_value, Q.sql_text
FROM v$sort_usage T, v$session S, v$sqlarea Q, dba_tablespaces TBS
WHERE T.session_addr = S.saddr
AND T.sqladdr = Q.address (+)
AND T.tablespace = TBS.tablespace_name
ORDER BY S.sid;
5.
PROMPT consuption by instances, tempfiles:
select
s.INST_ID iid,
segfile#,
round(sum (((u.blocks*par.value)/1024/1024)),2) size_mb
from
gv$sort_usage u,
gv$session s,
gv$process p,
v$parameter par
where
s.inst_id=u.inst_id AND
s.saddr = u.session_addr AND
s.paddr = p.addr AND
par.name='db_block_size'
group by
s.INST_ID,
segfile#
order by 1,2
;
TEMP tablespace currently using
1.
set linesize 200
col sid format a12
col sql_text format a50
select s.sid || ',' || s.serial# sid,s.username,u.tablespace,
substr(a.sql_text, 1, (instr(a.sql_text, ' ')-1)) sql_text,
round(((u.blocks*p.value)/1024/1024),2) size_mb,s.sql_id
from v$sort_usage u, v$session s, v$sqlarea a,v$parameter p
where s.saddr = u.session_addr
and a.address (+) = s.sql_address
and a.hash_value (+) = s.sql_hash_value
and p.name = 'db_block_size'
group by s.sid || ',' || s.serial#, s.username,
substr(a.sql_text, 1, (instr (a.sql_text, ' ')-1)),u.tablespace,round(((u.blocks*p.value)/1024/1024),2),s.sql_id;
2
select
s.INST_ID node,
segfile#,
round(sum (((u.blocks*par.value)/1024/1024)),2) size_mb,s.sql_id
from
gv$sort_usage u,
gv$session s,
gv$process p,
v$parameter par
where
s.inst_id=u.inst_id AND
s.saddr = u.session_addr AND
s.paddr = p.addr AND
par.name='db_block_size'
group by
s.INST_ID,
segfile#,s.sql_id
order by 1,2
;
3.
set linesize 140
set pagesize 400
set head on
col iid for 990
col sid_serial for a11
column username format a10
col module for a13
col action for a15
col state for a10
column segfile# format 9,999 heading 'File|ID'
col orapid for 999999 Heading "orapid||Oracle|pid"
col dbpid for a6 HEADING "spid|Unix|pid"
col apppid for a10;
column program format a55
column segblk# format 999,999,999 heading 'Block|ID'
set timi off;
CLEAR COMPUTES;
break on iid
select distinct
s.INST_ID iid,
lpad(s.sid,5)||','|| Lpad(s.serial#,5) sid_serial,
p.pid orapid,
p.spid dbpid,
s.USERNAME,
round(sum (((u.blocks*par.value)/1024/1024)),2) size_mb,
s.status,
s.state,
u.SQL_ID,
segfile#,
s.module,
s.action
from
gv$sort_usage u,
gv$session s,
gv$process p,
v$parameter par
where
s.inst_id=u.inst_id AND
s.saddr = u.session_addr AND
s.paddr = p.addr AND
par.name='db_block_size'
group by
s.INST_ID,
lpad(s.sid,5)||','|| Lpad(s.serial#,5),
p.pid,
p.spid,
s.USERNAME,
s.status,
s.state,
u.SQL_ID,
segfile#,
s.module,
s.action
order by 1,2
;
4
SELECT S.sid || ',' || S.serial# sid_serial, S.username,
T.blocks * TBS.block_size / 1024 / 1024 mb_used, T.tablespace,
T.sqladdr address, Q.hash_value, Q.sql_text
FROM v$sort_usage T, v$session S, v$sqlarea Q, dba_tablespaces TBS
WHERE T.session_addr = S.saddr
AND T.sqladdr = Q.address (+)
AND T.tablespace = TBS.tablespace_name
ORDER BY S.sid;
5.
PROMPT consuption by instances, tempfiles:
select
s.INST_ID iid,
segfile#,
round(sum (((u.blocks*par.value)/1024/1024)),2) size_mb
from
gv$sort_usage u,
gv$session s,
gv$process p,
v$parameter par
where
s.inst_id=u.inst_id AND
s.saddr = u.session_addr AND
s.paddr = p.addr AND
par.name='db_block_size'
group by
s.INST_ID,
segfile#
order by 1,2
;
sqlplus Command Line History
sqlplus Command Line History
Doskey functionality in sqlplus on linux platform
sqlplus History
sql doskey ( like old days on dos )
sqlplus doskey
rlwrap is a Command Line History and Editing in SQL*Plus and RMAN on Linux
http://utopia.knoware.nl/~hlub/uck/rlwrap/
wget http://utopia.knoware.nl/~hlub/uck/rlwrap/rlwrap-0.37.tar.gz
apt-amd-02:/home/anujs/Downloads/rlwrap-0.37 # wget http://utopia.knoware.nl/~hlub/uck/rlwrap/rlwrap-0.37.tar.gz
--2011-05-03 12:44:25-- http://utopia.knoware.nl/~hlub/uck/rlwrap/rlwrap-0.37.tar.gz
Resolving utopia.knoware.nl... 213.197.30.29
Connecting to utopia.knoware.nl|213.197.30.29|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 251438 (246K) [application/x-gzip]
Saving to: `rlwrap-0.37.tar.gz'
100%[==========================================================================================================================================>] 251,438 1.12M/s in 0.2s
2011-05-03 12:44:25 (1.12 MB/s) - `rlwrap-0.37.tar.gz' saved [251438/251438]
or
rpm
Download your RPM according to your OS
apt-amd-02:/home/anujs/Downloads # cat /etc/issue
Welcome to openSUSE 11.3 "Teal" - Kernel \r (\l).
rlwrap-0.30-56.1.x86_64.rpm
Download software from this site as per your OS
http://rpm.pbone.net/index.php3?stat=3&search=rlwrap&srodzaj=3
OpenSuSE ftp.opensuse.org/distribution/11.2/repo/oss/suse/x86_64/rlwrap-0.30-56.1.x86_64.rpm
install this RPM
apt-amd-02:/home/anujs/Downloads # rpm -Uvh rlwrap-0.30-56.1.x86_64.rpm
Preparing... ########################################### [100%]
package rlwrap-0.30-56.1.x86_64 is already installed
go to oracle user
su - oracle
edit your .bash_profile with following line
alias hsqlplus='rlwrap sqlplus'
alias hman='rlwrap rman'
alias hsql='rlwrap sqlplus'
alias sql="rlwrap -i -f ~/.sqlplus_history -H ~/.sqlplus_history -s 30000 sqlplus"
touch ~/.sqlplus_history
this will store 30000 line in .sqlplus_history file
or
export RLWRAP_EDITOR="vim +%L -c 'syntax on' -c 'set filetype=sql'"
alias sysdba='rlwrap -m -s5000 sqlplus / as sysdba'
oracle@apt-amd-02:~> hsqlplus
SQL*Plus: Release 11.2.0.1.0 Production on Tue May 3 11:54:26 2011
Copyright (c) 1982, 2009, Oracle. All rights reserved.
Enter user-name: scott/tiger
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
SQL> select * from tab;
TNAME TABTYPE CLUSTERID
------------------------------ ------- ----------
BONUS TABLE
DEPT TABLE
EMP TABLE
SALGRADE TABLE
T TABLE
sql>
now if you press arrow key, you will able to see previous commands !!!!!!!!!!!!!!!!!!!!!!!!
=====================================================================================================================================
download !!
wget ftp://ftp.pbone.net/mirror/archive.fedoraproject.org/epel/6/x86_64/Packages/r/rlwrap-0.42-1.el6.x86_64.rpm
--2022-03-10 07:51:15-- ftp://ftp.pbone.net/mirror/archive.fedoraproject.org/epel/6/x86_64/Packages/r/rlwrap-0.42-1.el6.x86_64.rpm
=> ‘rlwrap-0.42-1.el6.x86_64.rpm’
Resolving ftp.pbone.net (ftp.pbone.net)... 93.179.225.212
Connecting to ftp.pbone.net (ftp.pbone.net)|93.179.225.212|:21... connected.
Logging in as anonymous ... Logged in!
==> SYST ... done. ==> PWD ... done.
==> TYPE I ... done. ==> CWD (1) /mirror/archive.fedoraproject.org/epel/6/x86_64/Packages/r ... done.
==> SIZE rlwrap-0.42-1.el6.x86_64.rpm ... 95240
==> PASV ... done. ==> RETR rlwrap-0.42-1.el6.x86_64.rpm ... done.
Length: 95240 (93K) (unauthoritative)
100%[===================================================================================================================================================>] 95,240 166KB/s in 0.6s
2022-03-10 07:51:17 (166 KB/s) - ‘rlwrap-0.42-1.el6.x86_64.rpm’ saved [95240]
rpm -ivh rlwrap-0.42-1.el6.x86_64.rpm
warning: rlwrap-0.42-1.el6.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID 0608b895: NOKEY
Preparing... ################################# [100%]
Updating / installing...
1:rlwrap-0.42-1.el6 ################################# [100%]
su - oracle
touch /home/oracle/.oracle_keywords
alias sqlplus='/usr/bin/rlwrap -if $HOME/.oracle_keywords $ORACLE_HOME/bin/sqlplus'
rlwrap sqlplus / as sysdba
rlwrap sqlplus / as sysdba
SQL*Plus: Release 12.2.0.1.0 Production on Thu Mar 10 07:54:51 2022
Copyright (c) 1982, 2016, Oracle. All rights reserved.
Connected to:
Oracle Database 12c Enterprise Edition Release 12.2.0.1.0 - 64bit Production
SQL> select * from dual;
D
-
X
Friday, 29 April 2011
Oracle Block recovey using RMAN
RMAN Block RECOVERY
perform Block Media Recovery using RMAN
ORA-01578: ORACLE data block corrupted
RMAN RECOVER BLOCK
SQL> select FILE_NAME from dba_data_files ;
FILE_NAME
--------------------------------------------------------------------------------
/opt/app/oracle/oradata/orcl/users01.dbf
/opt/app/oracle/oradata/orcl/undotbs01.dbf
/opt/app/oracle/oradata/orcl/sysaux01.dbf
/opt/app/oracle/oradata/orcl/system01.dbf
/opt/app/oracle/oradata/orcl/example01.dbf
SQL> create tablespace anujtest datafile '/opt/app/oracle/oradata/orcl/anujtest.dbf' size 10m
autoextend on next 5m extent management local segment space management auto ;
Tablespace created.
apt-lnxtst-01:ORCL\sys> create user anujtest identified by anujtest default tablespace anujtest quota unlimited on anujtest ;
User created.
grant connect , resource to anujtest ;
apt-lnxtst-01:ORCL\sys> conn anujtest/anujtest
Connected.
orcl\anujtest> connect / as sysdba
Connected.
apt-lnxtst-01:ORCL\sys>conn anujtest/anujtest
Connected.
orcl\anujtest> create table test as select * from all_objects ;
Table created.
SQL> connect / as sysdba
Connected.
SQL> col FILE_NAME format a50
SQL> select FILE_NAME,FILE_ID from dba_data_files;
FILE_NAME FILE_ID
-------------------------------------------------- ----------
/opt/app/oracle/oradata/orcl/users01.dbf 4
/opt/app/oracle/oradata/orcl/undotbs01.dbf 3
/opt/app/oracle/oradata/orcl/sysaux01.dbf 2
/opt/app/oracle/oradata/orcl/system01.dbf 1
/opt/app/oracle/oradata/orcl/example01.dbf 5
/opt/app/oracle/oradata/orcl/anujtest.dbf 6 <<<<<<<<<<<<-------
6 rows selected.
RMAN> connect target /
connected to target database: ORCL (DBID=1267852645)
RMAN> backup datafile 6 tag=good;
Starting backup at 29-APR-11
using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=53 device type=DISK
channel ORA_DISK_1: starting full datafile backup set
channel ORA_DISK_1: specifying datafile(s) in backup set
input datafile file number=00006 name=/opt/app/oracle/oradata/orcl/anujtest.dbf
channel ORA_DISK_1: starting piece 1 at 29-APR-11
channel ORA_DISK_1: finished piece 1 at 29-APR-11
piece handle=/opt/app/oracle/flash_recovery_area/ORCL/backupset/2011_04_29/o1_mf_nnndf_GOOD_6vnsol06_.bkp tag=GOOD comment=NONE
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:03
Finished backup at 29-APR-11
RMAN> list backup;
List of Backup Sets
===================
BS Key Type LV Size Device Type Elapsed Time Completion Time
------- ---- -- ---------- ----------- ------------ ---------------
1 Full 7.48M DISK 00:00:01 29-APR-11
BP Key: 1 Status: AVAILABLE Compressed: NO Tag: GOOD
Piece Name: /opt/app/oracle/flash_recovery_area/ORCL/backupset/2011_04_29/o1_mf_nnndf_GOOD_6vnsol06_.bkp
List of Datafiles in backup set 1
File LV Type Ckp SCN Ckp Time Name
---- -- ---- ---------- --------- ----
6 Full 7522958 29-APR-11 /opt/app/oracle/oradata/orcl/anujtest.dbf
RMAN>Ctrl+d or exit
Recovery Manager complete.
SQL> col SEGMENT_NAME format a20
SQL> r
1 select segment_name , header_file , header_block from dba_segments
2 where segment_name = 'TEST'
3* and owner = 'ANUJTEST'
SEGMENT_NAME HEADER_FILE HEADER_BLOCK
-------------------- ----------- ------------
TEST 6 130
to get file name
col name format a70
select a.name from v$datafile a , dba_segments b
where a.file#=b.header_file and b.segment_name='TEST'
NAME
----------------------------------------------------------------------
/opt/app/oracle/oradata/orcl/anujtest.dbf
The header of the table is in block 130, so if the block 131 or so are corrupted we will get an error when we try to select data from the table.
Lets corrupt block 12 using the "dd" command in Linux.
oracle@apt-amd-02:/opt/app/oracle/oradata/orcl> dd of=anujtest.dbf bs=8192 conv=notrunc seek=130 << EOF
anuj Corrupted.
EOF
0+1 records in
0+1 records out
16 bytes (16 B) copied, 0.000109246 s, 146 kB/s
SQL> select count(*) from anujtest.test ; ----- because whole table in cache
COUNT(*)
----------
55632
SQL> alter system flush buffer_cache;
System altered.
SQL> select count(*) from anujtest.test ;
select count(*) from anujtest.test
*
ERROR at line 1:
ORA-01578: ORACLE data block corrupted (file # 6, block # 130)
ORA-01110: data file 6: '/opt/app/oracle/oradata/orcl/anujtest.dbf'
oracle@apt-amd-02:/opt/app/oracle/oradata/orcl> rman
Recovery Manager: Release 11.2.0.1.0 - Production on Fri Apr 29 07:45:30 2011
Copyright (c) 1982, 2009, Oracle and/or its affiliates. All rights reserved.
RMAN> connect target /
connected to target database: ORCL (DBID=1267852645)
RMAN> BLOCKRECOVER DATAFILE 6 BLOCK 130;
Starting recover at 29-APR-11
using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=50 device type=DISK
channel ORA_DISK_1: restoring block(s)
channel ORA_DISK_1: specifying block(s) to restore from backup set
restoring blocks of datafile 00006
channel ORA_DISK_1: reading from backup piece /opt/app/oracle/flash_recovery_area/ORCL/backupset/2011_04_29/o1_mf_nnndf_GOOD_6vnsol06_.bkp
channel ORA_DISK_1: piece handle=/opt/app/oracle/flash_recovery_area/ORCL/backupset/2011_04_29/o1_mf_nnndf_GOOD_6vnsol06_.bkp tag=GOOD
channel ORA_DISK_1: restored block(s) from backup piece 1
channel ORA_DISK_1: block restore complete, elapsed time: 00:00:01
starting media recovery
media recovery complete, elapsed time: 00:00:08
Finished recover at 29-APR-11
RMAN>
now block recovered
SQL> select count(*) from anujtest.test ;
COUNT(*)
----------
55632
perform Block Media Recovery using RMAN
ORA-01578: ORACLE data block corrupted
RMAN RECOVER BLOCK
SQL> select FILE_NAME from dba_data_files ;
FILE_NAME
--------------------------------------------------------------------------------
/opt/app/oracle/oradata/orcl/users01.dbf
/opt/app/oracle/oradata/orcl/undotbs01.dbf
/opt/app/oracle/oradata/orcl/sysaux01.dbf
/opt/app/oracle/oradata/orcl/system01.dbf
/opt/app/oracle/oradata/orcl/example01.dbf
SQL> create tablespace anujtest datafile '/opt/app/oracle/oradata/orcl/anujtest.dbf' size 10m
autoextend on next 5m extent management local segment space management auto ;
Tablespace created.
apt-lnxtst-01:ORCL\sys> create user anujtest identified by anujtest default tablespace anujtest quota unlimited on anujtest ;
User created.
grant connect , resource to anujtest ;
apt-lnxtst-01:ORCL\sys> conn anujtest/anujtest
Connected.
orcl\anujtest> connect / as sysdba
Connected.
apt-lnxtst-01:ORCL\sys>conn anujtest/anujtest
Connected.
orcl\anujtest> create table test as select * from all_objects ;
Table created.
SQL> connect / as sysdba
Connected.
SQL> col FILE_NAME format a50
SQL> select FILE_NAME,FILE_ID from dba_data_files;
FILE_NAME FILE_ID
-------------------------------------------------- ----------
/opt/app/oracle/oradata/orcl/users01.dbf 4
/opt/app/oracle/oradata/orcl/undotbs01.dbf 3
/opt/app/oracle/oradata/orcl/sysaux01.dbf 2
/opt/app/oracle/oradata/orcl/system01.dbf 1
/opt/app/oracle/oradata/orcl/example01.dbf 5
/opt/app/oracle/oradata/orcl/anujtest.dbf 6 <<<<<<<<<<<<-------
6 rows selected.
RMAN> connect target /
connected to target database: ORCL (DBID=1267852645)
RMAN> backup datafile 6 tag=good;
Starting backup at 29-APR-11
using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=53 device type=DISK
channel ORA_DISK_1: starting full datafile backup set
channel ORA_DISK_1: specifying datafile(s) in backup set
input datafile file number=00006 name=/opt/app/oracle/oradata/orcl/anujtest.dbf
channel ORA_DISK_1: starting piece 1 at 29-APR-11
channel ORA_DISK_1: finished piece 1 at 29-APR-11
piece handle=/opt/app/oracle/flash_recovery_area/ORCL/backupset/2011_04_29/o1_mf_nnndf_GOOD_6vnsol06_.bkp tag=GOOD comment=NONE
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:03
Finished backup at 29-APR-11
RMAN> list backup;
List of Backup Sets
===================
BS Key Type LV Size Device Type Elapsed Time Completion Time
------- ---- -- ---------- ----------- ------------ ---------------
1 Full 7.48M DISK 00:00:01 29-APR-11
BP Key: 1 Status: AVAILABLE Compressed: NO Tag: GOOD
Piece Name: /opt/app/oracle/flash_recovery_area/ORCL/backupset/2011_04_29/o1_mf_nnndf_GOOD_6vnsol06_.bkp
List of Datafiles in backup set 1
File LV Type Ckp SCN Ckp Time Name
---- -- ---- ---------- --------- ----
6 Full 7522958 29-APR-11 /opt/app/oracle/oradata/orcl/anujtest.dbf
RMAN>Ctrl+d or exit
Recovery Manager complete.
SQL> col SEGMENT_NAME format a20
SQL> r
1 select segment_name , header_file , header_block from dba_segments
2 where segment_name = 'TEST'
3* and owner = 'ANUJTEST'
SEGMENT_NAME HEADER_FILE HEADER_BLOCK
-------------------- ----------- ------------
TEST 6 130
to get file name
col name format a70
select a.name from v$datafile a , dba_segments b
where a.file#=b.header_file and b.segment_name='TEST'
NAME
----------------------------------------------------------------------
/opt/app/oracle/oradata/orcl/anujtest.dbf
The header of the table is in block 130, so if the block 131 or so are corrupted we will get an error when we try to select data from the table.
Lets corrupt block 12 using the "dd" command in Linux.
oracle@apt-amd-02:/opt/app/oracle/oradata/orcl> dd of=anujtest.dbf bs=8192 conv=notrunc seek=130 << EOF
anuj Corrupted.
EOF
0+1 records in
0+1 records out
16 bytes (16 B) copied, 0.000109246 s, 146 kB/s
SQL> select count(*) from anujtest.test ; ----- because whole table in cache
COUNT(*)
----------
55632
SQL> alter system flush buffer_cache;
System altered.
SQL> select count(*) from anujtest.test ;
select count(*) from anujtest.test
*
ERROR at line 1:
ORA-01578: ORACLE data block corrupted (file # 6, block # 130)
ORA-01110: data file 6: '/opt/app/oracle/oradata/orcl/anujtest.dbf'
oracle@apt-amd-02:/opt/app/oracle/oradata/orcl> rman
Recovery Manager: Release 11.2.0.1.0 - Production on Fri Apr 29 07:45:30 2011
Copyright (c) 1982, 2009, Oracle and/or its affiliates. All rights reserved.
RMAN> connect target /
connected to target database: ORCL (DBID=1267852645)
RMAN> BLOCKRECOVER DATAFILE 6 BLOCK 130;
Starting recover at 29-APR-11
using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=50 device type=DISK
channel ORA_DISK_1: restoring block(s)
channel ORA_DISK_1: specifying block(s) to restore from backup set
restoring blocks of datafile 00006
channel ORA_DISK_1: reading from backup piece /opt/app/oracle/flash_recovery_area/ORCL/backupset/2011_04_29/o1_mf_nnndf_GOOD_6vnsol06_.bkp
channel ORA_DISK_1: piece handle=/opt/app/oracle/flash_recovery_area/ORCL/backupset/2011_04_29/o1_mf_nnndf_GOOD_6vnsol06_.bkp tag=GOOD
channel ORA_DISK_1: restored block(s) from backup piece 1
channel ORA_DISK_1: block restore complete, elapsed time: 00:00:01
starting media recovery
media recovery complete, elapsed time: 00:00:08
Finished recover at 29-APR-11
RMAN>
now block recovered
SQL> select count(*) from anujtest.test ;
COUNT(*)
----------
55632
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