Oracle Magazine July/August 2010

Oracle Magazine for July/August 2010 available at the below link

http://www.oraclemagazine-digital.com/oraclemagazine/20100708?sub_id=oW7rAkMPiAA4#pg2

Change Negative (-) Value to Positive (+) Value in Oracle

Description:
We can use the below method to change the records into Negative to Positive.
Solution:
SQL>create table tmp (col1 number)
SQL>SET DEFINE OFF;
SQL>Insert into TMP(COL1) Values(-1);
SQL>Insert into TMP(COL1)Values(-2);
SQL>Insert into TMP(COL1) Values(-20);
SQL>Insert into TMP(COL1)Values(300);
SQL>COMMIT;
SQL>select col1,case when sign(col1)=-1 then '('||(col1)*(-1)||')' else to_char(col1) end col1 from tmp;

Connection to sys /as sysdba hangs

Description:
When I try to connect database using sys /as sysdba database hangs. No response from the database. I tried the below method to solve this issue.
Solution:
Step 1: Tried sqlplus connect " / as sysdba", found that Database hangs.
Step 2: While this connection hangs, opened a different session, issued the following command to find the Oracle related process.
$ps -ef | grep ORACLE_SID
Step 3: Killed the below the Oracle related process using th below command.
kill -9 pid of processess that are connected that are not related to the sysdba connection (pid from Step 2)
Step 4: Now successfully logged into sys/as sysdba session returns SQL prompt, and issued the following
SQL> shutdown abort
SQL> startup restrict
SQL> shutdown immediate
SQL> startup
Step 5: Checkd the database connections as sysdba are successful
$sqlplus "/as sysdba"
SQL> connect / as sysdba

Application Server Log File Details

Application Server Control Console:
ORACLE_HOME/j2ee/home/log/ascontrol.log
ORACLE_HOME/j2ee/home/log/home_default_group-1/
Content DB (Node Log):
ORACLE_HOME/content/log/domain_namenode_name.log
Content DB (Application Logs):
ORACLE_HOME/j2ee/OC4J_Content/application-deployments/Content/OC4J_Content_default_group_1/application.log
HTTP Server:
ORACLE_HOME/Apache/Apache/logs/error_log.log
OC4J instance_name:
ORACLE_HOME/j2ee/instance_name/log/instance_group_process/
ORACLE_HOME/j2ee/instance_name/application-deployments/application_name/application.log
OC4J instance_name:
ORACLE_HOME/j2ee/instance_name/log/instance_group_process/oc4j/log.xml
OPMN:
ORACLE_HOME/opmn/logs
ORACLE_HOME/opmn/logs/component_type~
Port Tunneling:
ORACLE_HOME/iaspt/logs
Universal Installer:
ORACLE_HOME/cfgtoollogs
WebCenter (Application Logs):
ORACLE_HOME/j2ee/OC4J_WebCenter/application-deployments/type/OC4J_WebCenter_default_group_1/application.log

How do I check Oracle Application Server Version details?

We can use the below files to find Oracle Application Server versions details

ORACLE_HOME\config\ias.properties
ORACLE_HOME\install\readme.txt
ORACLE_HOME\install\setupinfo.txt
C:\Program Files\Oracle\Inventory\logs\installActions_installed_date

Auditing Login/Logout Session information

Description:

Below method can be used to store Session Login and Logout Information. It stores in to a table.

Step 1: Create UserLogAudit Table using the below script

CREATE TABLE UserLogAudit
(
UserId VARCHAR2(30)
, SessionId NUMBER(8)
, HostName VARCHAR2(30)
, LogonDay DATE
, LogonTime VARCHAR2(10)
, LogoffDay DATE
, LogoffTime VARCHAR2(10)
, ElapsedMinutes Number(8)
, Updated DATE
, UpdatedBy VARCHAR2(50)
);

Step 2: Create Logon Trigger to get Logon Information

CREATE OR REPLACE TRIGGER LogonAuditTrigger AFTER LOGON ON DATABASE
BEGIN

INSERT INTO USERLOGAUDIT VALUES (User
, Sys_Context('USERENV','SESSIONID')
, Sys_Context('USERENV','HOST')
, Sysdate
, to_char(Sysdate, 'hh24:mi:ss')
, null
, null
, null
);

END;

Step 3: Create Logoff Trigger to get Logoff Information

CREATE OR REPLACE TRIGGER LogoffAuditTrigger BEFORE LOGOFF ON DATABASE
BEGIN
-- UPDATE the logoff day
UPDATE USERLOGAUDIT
SET LogoffDay = sysdate
WHERE Sys_Context('USERENV','SESSIONID') = SessionId;

-- UPDATE the logoff time
UPDATE USERLOGAUDIT
SET LogoffTime = to_char(sysdate, 'hh24:mi:ss')
WHERE Sys_Context('USERENV','SESSIONID') = SessionId;

-- Compute the elapsed minutes
UPDATE USERLOGAUDIT
SET ElapsedMinutes = ROUND((LogoffDay - LogonDay)*1440)
WHERE Sys_Context('USERENV','SESSIONID') = SessionId;

END;

Oracle Magazine May/June 2010

Oracle Magazine for May/June 2010 available at the below link

http://www.oraclemagazine-digital.com/oraclemagazine/20100506?sub_id=oW7rAkMPiAA4#pg2

How do I Extract tar file?

We can use the below command to extract .tar file:

tar -xvf filename

We can use the below command to unzip the .gz file:

/usr/local/bin/gunzip -d filename

Script to Submit Oracle Job on Every Sunday

Description:
I used the below script to Schedule the job the Every Sunday 3 AM.

Script:
#### Script Starts Here ####

VARIABLE jobno NUMBER;
BEGIN
DBMS_JOB.SUBMIT(:jobno, 'SCHEMANAME.PACKAGENAME.PROCEDURENAME;', TRUNC(NEXT_DAY(SYSDATE,'SUNDAY'))+3/24,'TRUNC(NEXT_DAY(SYSDATE,''SUNDAY''))+3/24 ');
COMMIT;
END;
/
#### Script Ends Here ####

13761: Current form cannot be executed without current profile context (Oracle Clinical)

Description:
Below error occurs while accessing, Oracle Clinical
Maintain Discrepancy Database for a Study screen.
13761: Current form cannot be executed without current profile context.

Solution:

Lack of "RXC_DMGR" role the above error occurrs. Grant RXC_DMGR role to the user solves the issue.

Step 1: Login as SYS
Step 2: GRANT RXC_DMGR TO OPS$USERNAME;

Script to Delete Trace Files

Description:
Below script can be used to delete trace files older than 15 days.

Script:

#/usr/bin/sh!

TRACE_TOKEEP=15
TDUMP_DIR=
find $TDUMP_DIR -name "*.trc" -mtime +$TRACE_TOKEEP -exec rm -f {} \;

ORA-01950: no privileges on tablespace 'USERS'

Description:

User faced ORA-01950: no privileges on tablespace 'USERS' error.

Solution:

I granted below privilege to the user to avoid ORA-1950 Error.

ALTER USER USERNAME QUOTA UNLIMITED ON USERS;

How to change Archive Log Destination

Description:

I used below steps to change Archivelog destination for Oracle 10g.

Step 1: Login to Database as SYSDBA

Step 2: Check the Archive Destination using archive log list command.

Step 3: Set the value of db_recovery_file_dest Parameter.

Step 4: Set the value for db_recovery_file_dest_size Parameter

Step 5: Check the new location for Archivelog destination

Step 6: Use the below command to generate Archivelog.

Step 7: Use the below command to check Archive Destination and log sequence.

Change Database from NoArchivelog to Archivelog Mode

Description:

I used the below steps to change Archivelog mode.

Step 1: To check Database Mode

Step 2: Shutdown the database:

Step 3: Start the Database using mount stage

Step 4: Change the Database to archivelog mode.

Step 5: Open the Database:

Step 6: To check the Database Mode

Script to Rebuild Indexes

Description:

Shell Script to Rebuild the Indexes

#### Script Starts Here ####

#!/bin/sh
. .profile
# Print Start Time
startTime=`date`
echo
echo "Starting Time $startTime"
rebuild1=/tmp/rebuild.tmp
sqlplus -s system/manager << ! > $rebuild1
set pagesize 0
set feedback off
SELECT 'ALTER INDEX '||owner||'.'||index_name||' REBUILD TABLESPACE '||tablespace_name||' ONLINE;'
FROM DBA_INDEXES
where owner not in ('SYSTEM','SYS');
!
sqlplus -s system/manager << !
set feedback off
set pagesize 0
set echo on
set time on
set timing on
@$rebuild1
exit
!
# Print End Time
endTime=`date`
echo
echo "Rebuild Schema Successfully Completed"
echo "Ending Time $endTime"

#### Script Ends Here ####