OMS_HOST and EM_UPLOAD_PORT is not available While deploying OMS AGENT ON TARGET 13C OEM

dont forget  OMS server to write in /etc/hosts on all TARGET servers

OMS SERVER must be reachable From all target servers....!!

add oms server in /etc/hosts

vi /etc/hosts

xxx.xxx.x.xxx OMSSERVER.DOMAIN.NAME OMSSERVER

How to Configure Multipath on Oracle Linux

After creating new disk on SAN and presenting on host.. Scan the host bus  with below command on server;

echo "- - -" > /sys/class/scsi_host/host0/scan

Note: if you have more then one host bus then scan for each one by changing "host0"  to  "host1" and go on...

Output  Before Scanning host bus;

[root@testdb /]# cd /dev/disk/
[root@testdb disk]# ll
total 0
drwxr-xr-x. 2 root root 240 Feb  5 16:52 by-id
drwxr-xr-x. 2 root root 120 Feb  5 16:52 by-path
drwxr-xr-x. 2 root root 100 Feb  5 16:52 by-uuid
[root@testdb disk]# cd by-id/
[root@testdb by-id]# ll
total 0
lrwxrwxrwx. 1 root root 16 Feb  5 16:52 cciss-3600508b100184a39535748394f500006 -> ../../cciss/c0d0
lrwxrwxrwx. 1 root root 18 Feb  5 16:52 cciss-3600508b100184a39535748394f500006-part1 -> ../../cciss/c0d0p1
lrwxrwxrwx. 1 root root 18 Feb  5 16:52 cciss-3600508b100184a39535748394f500006-part2 -> ../../cciss/c0d0p2
lrwxrwxrwx. 1 root root 10 Feb  5 16:52 dm-name-vg_testdb-lv_root -> ../../dm-0
lrwxrwxrwx. 1 root root 10 Feb  5 16:52 dm-name-vg_testdb-lv_swap -> ../../dm-1
lrwxrwxrwx. 1 root root 10 Feb  5 16:52 dm-uuid-LVM-a84PMI5ipJD3bHQ3jD5MKMpRxCoXRWn0pBKsI1EsJVypftv78hkRRPbpJMvO71Q2 -> ../../dm-0
lrwxrwxrwx. 1 root root 10 Feb  5 16:52 dm-uuid-LVM-a84PMI5ipJD3bHQ3jD5MKMpRxCoXRWn0zIvrWlJWKRoW126ZyzhSwd1Tr0Pyd7sx -> ../../dm-1
lrwxrwxrwx. 1 root root 16 Feb  5 16:52 wwn-0x600508b100184a39535748394f500006 -> ../../cciss/c0d0
lrwxrwxrwx. 1 root root 18 Feb  5 16:52 wwn-0x600508b100184a39535748394f500006-part1 -> ../../cciss/c0d0p1
lrwxrwxrwx. 1 root root 18 Feb  5 16:52 wwn-0x600508b100184a39535748394f500006-part2 -> ../../cciss/c0d0p2

Oracle 12c Cloud ORA-01017 and Changing 'SYSMAN' Password

 check the oms  logs  located in ;

            /u01/app/oracle/gc_inst/user_projects/domains/GCDomain/servers/EMGC_OMS1/logs/EMGC_OMS1.out


make sure you get the error ORA-01017 in log file...

then stop all the OMS

/u01/app/oracle/Middleware/oms/bin/emctl stop oms

Modify the password of 'SYSMAN';

/u01/app/oracle/Middleware/oms/bin/emctl config oms -change_repos_pwd -use_sys_pwd -sys_pwd <Password of SYS> -new_pwd <New Password for SYSMAN>

output of the above command;

[oracle@emcloud bin]$ ./emctl config oms -change_repos_pwd -use_sys_pwd -sys_pwd oracle -new_pwd Password1


Oracle Enterprise Manager Cloud Control 12c Release 3
Copyright (c) 1996, 2013 Oracle Corporation.  All rights reserved.
Changing passwords in backend ...
Passwords changed in backend successfully.
Updating repository password in Credential Store...
Successfully updated Repository password in Credential Store.
Restart all the OMSs using 'emctl stop oms -all' and 'emctl start oms'.
Successfully changed repository password.

start all the OMS;

 /u01/app/oracle/Middleware/oms/bin/emctl start oms  


- Erol

Configuring Scsi as trusted device after presenting SAN disks on Oracle Linux 6.4 host

You have to add below line in "/etc/scsi_id.config" (if scsi_id.config doesnt exist ,create one)

options=-g

EMCTL(Enterprise Manager) Invalid Connection Pool. ERROR = ORA-28000:

Check SYSMAN and DBSNMP account status...this problem can be related with wrong password configuration of emctl...

first check status of SYSMAN and DBSNMP;

select account_status,lock_date,username from dba_users where username in ('SYSMAN','DBSNMP');

ACCOUNT_STATUS                   LOCK_DATE       USERNAME
-------------------------------- --------------- ------------------------------
OPEN                                                                          DBSNMP
LOCKED(TIMED)                         17-06-13              SYSMAN

SYSMAN status LOCKED ...before unlocking sysman accout stop the dbconsole;

 emctl stop dbconsole

Then

 sqlplus / as sysdba

SQL> alter user sysman account unlock;
SQL> alter user sysman identified by  NEWPASSWORD;

and set password of emctl  with oracle user; and set dbconsole password as NEWPASSWORD

emctl setpasswd dbconsole

start dbconsole

emctl start dbconsole 

-Erol

TRUNCATE Aud$ table to prevent system tablespace from getting bigger...

My system tablespace was getting bigger everyday and i realized that  aud$ table was causing this problem and scheluding a  crontab-job truncating aud$ table on monday and thursday ..simply solved my problem..

with oracle user;

vi /home/oracle/scripts/truncate_aud_table.sh

then copy paste  into truncate_aud_table.sh

 #!/bin/bash
. /home/oracle/.bash_profile
output=`sqlplus -s "/ as sysdba" <<EOF
       set heading off feedback off verify off
       TRUNCATE TABLE aud$;
       exit
EOF
`
echo $output

after creating sh , give permissions

chmod 775  /home/oracle/scripts/truncate_aud_table.sh

and add it on crontab ;

00 15 * * 1,4 /home/oracle/scripts/audit_sil.sh > /home/oracle/scripts/audit_sil.log 2>&1

Will run on Monday and Thursday at 15:00 ..

ASM file metadata operation (Non-Exadata)

    Today our developers were complaining about performance issue , and there were nothing special which could cause high cpu usage on server  but  there were many sessions with wait event "ASM file metadata operation" and "ksv master wait'"...after googling and digging the oracle support,  finally found doc id (1308282.1) related to problem with paramater "cell_offload_processing".. whydoes oracle use cell_offload_processing? 

     In Exadata Database Machine , Cell Offloading:The storage cells are saving the database node from processing some workload  to inside them..this process can be referred to as cell offloading...In a Non-Exadata Oracle database , when someone selects a single column in a row , entire block related to row will be writting from the disks to  buffer cache and then selected row will be extracted from this block..but Exadata database machine can pull desired rows from disks directly instead of writing entire block to buffer cache(this is also know as smart-scan)..Smart-scan can help to reduce I/O on database server.

  

     But in a Non-Exadata Oracle database, cell_offload_processing can be set as "FALSE" to solve this problem...

"alter system set cell_offload_processing = false;" 

This issue is also known as a bug and can be handled by applying Patch 11800170...

- Erol

Oracle Linux Desktop Gui Problem

You have to install these packages while installing oracle linux to have desktop gui...

"X Window System" , "Desktop General Purpose", "Desktop Graphical Administration Tools", "Legacy X Window System compatibility"

If u miss installing these packages.. u can install with yum

yum groupinstall "X Window System" Desktop "General Purpose Desktop"  "Graphical Administration Tools" "Legacy X Window System compatibility"
if u dont have internet u need to install rpms manually from installation cd

-Erol

Oracle Sample Rman Scripts

Rman full backup script;
Rman Level 1 Cumulative;

ORA-12991: column is referenced in a multi-column constraint (Related to GoldenGate)

After moving our 10g database to 11g with golden gate...our developers were complaining about ORA-12991: column is referenced in a multi-column constraint...This problem is related to enabling Supplemental Logging with "ALTER DATABASE ADD SUPPLEMENTAL LOG DATA" , when u try to drop a column...First of all u have to find what  log_group_name causes the problem...

SQL> select log_group_name from dba_log_groups where table_name = 'TABLE_NAME' ;

LOG_GROUP_NAME
============================
GGS_DROP_COLS_24242


Then drop it;


SQL> alter table table_name drop supplemental log group GGS_DROP_COLS_24242;

table altered.



- Erol