VNC Server Installation Steps

PURPOSE: All documents are provided on this Blog just for educational purposes only.  Please make sure that you run it in your test environment before to move on to production environment. 

yum groupinstall "Server with GUI"
unalias shutdown
shutdown -r now
yum install tigervnc-server xorg-x11-fonts-Type1
yum install xorg-x11-xauth xorg-x11-fonts-* xorg-x11-utils

vncpasswd

pwd
/root
cd .vnc/

The File config file looks like as follow and no need to change.

vi .vnc/config

# securitytypes=vncauth,tlsvnc
# desktop=sandbox
# geometry=2000x1200
# 1920x1200
# localhost

# alwaysshared

VNC start stop script

Create a VNC start script as follow. 

more startVNC_55
vncserver -kill :55
sleep 5

vncserver :55 -geometry 1920x1200

./startVNC_55 &

ps -ef|grep vnc

MobaX

hostname=vm-adm-vnc-th.com

port=5955

For DISPLAY

NOTE: check following setting 

vi /etc/ssh/sshd_config
Uncheck and set to no
X11UseLocalhost no

service sshd restart

xhost +

or

xhost

ssh username@hostname -X

Test with the command

xclock

Your comments are most valuable and it would help me to come up with better posts. 

PLS-00302:component

 PLS-00302: component 'UNLOCK_TABLE_STATS' must be declared

PLS-00302: component 'UNLOCK_TABLE_STATS' must be declared

ORA-06550: line 1, column 7:

PURPOSE: All documents are provided on this Blog just for educational purposes only.  Please make sure that you run it in your test environment before to move on to production environment. 

SQL> exec dbms_stats.unlock_table_stats( ownname => 'HR' , tabname => 'EMPLOYEES');
BEGIN dbms_stats.unlock_table_stats( ownname => 'HR' , tabname => 'EMPLOYEES'); END;

                 *
ERROR at line 1:
ORA-06550: line 1, column 18:
PLS-00302: component 'UNLOCK_TABLE_STATS' must be declared
ORA-06550: line 1, column 7:

PL/SQL: Statement ignored

Solution:

exec sys.DBMS_STATS.UNLOCK_TABLE_STATS( ownname => 'HR' , tabname => 'EMPLOYEES');

Your comments are most valuable and it would help me to come up with better posts. 

Oracle create private public synonym command

How to create synonym in Oracle 

PURPOSE: All documents are provided on this Blog just for educational purposes only.  Please make sure that you run it in your test environment before to move on to production environment.  

Private Synonym:

1. Login as scheman user under where should create synonym

2.  schemaname is equal The Schema name for example. 

     TEST01

     TEST02

The user schema TEST01 should get synonym from all tables unter the schema TEST02 located.

Login as  TEST01

sqlplus TEST01

set echo off
set verify off
set pagesize 0
set trimspool on
set headsep off
set linesize 100
set heading off
set feedback off
set timing off
set time off
set termout off
set headsep off
spool create_private_synonom.sql
SELECT 'create public synonym ' || object_name || ' for TEST02.' || object_name || ' ;' FROM dba_objects
WHERE owner = 'TEST02'
AND object_type IN ('TABLE', 'SEQUENCE', 'VIEW', 'PROCEDURE', 'PACKAGE');
spool off

Verify the script before you execute. Examples line

...
create synonym EMPLOY_HR for TEST02.EMPLOY_HR ;

...

Execute the script as follow.

sqlplus TEST01

SQL> @create_private_synonom.sql

Or use simple different way.

set echo off

set feedback off; 

set heading off; 

set term off

set pagesize 1000

set linesize 100

SET PAGES 0

spool create_synonom_table.sql

select 'create synonym ' || table_name || ' for ' || owner || '.' || table_name || ';'  FROM all_tables WHERE owner='TEST02';

spool off

select 'create synonym ' ||view_name || ' for ' || owner || '.' || view_name || ';'  FROM all_views WHERE owner='TEST02';

Public Synonym:

For Public synonym we need to just add the keyword public.

SELECT 'create public synonym ' || object_name || ' for TEST02.' || object_name || ' ;' FROM dba_objects

WHERE owner = 'TEST02'

AND object_type IN ('TABLE', 'SEQUENCE', 'VIEW', 'PROCEDURE', 'PACKAGE');

Your comments are most valuable and it would help me to come up with better posts.

 

How to Share NFS Mount Step by Step

Mounting the NFS Share

PURPOSE: All documents are provided on this Blog just for educational purposes only.  Please make sure that you run it in your test environment before to move on to production environment. 

NOTE:  Following guide will show you how to Mount the NFS Share

• Source server  [your Server Name:test-db-01]

    ssh test-db-01
    vi /etc/exports
    /oracle/rman/backup test-db-02(rw,sync) test-db-03(rw,sync)

    /oracle/rman/backup/log jumphost-01(ro,sync,nohide,crossmnt)

           

         Execute following command 

     

    service nfs restart

    exportfs -ra

    

• Destination Server [test-db-02, test-db-03,jumphost-01]

 login to the destination server where you want to mount the filesystem. In our case are   the above listed server.

          

     ssh test-db-02  and ssh test-db-03

     mkdir -p /oracle/rman/backup

     chown -R oracle:dba /backup

     mount -t nfs test-db-01:/oracle/rman/backup /oracle/rman/backup

           

           Same step for test-db-03:

          

          And same steps for the jumphost-01 server.

          ssh jumphost-01

     mkdir -p /oracle/rman/backup/log

     chown -R oracle:dba /backup

     mount -t nfs jumphost-   01:/oracle/rman/backup/log /oracle/rman/backup/log

    

     Add the entry on each server in the fstab file. In case of reboot the server,

          The mount will happen automatically.

     vi /etc/fstab

     test-db-01:oracle/rman/backup               oracle/rman/backup            nfs                defaults        0 0

 

Clean the flashback recovery area

free space in flash recovery area

PURPOSE: All documents are provided on this Blog just for educational purposes only.  Please make sure that you run it in your test environment before to move on to production environment. 

 NOTE: You can remove the file on the filesystem level.

cd /fast_recovery_area/TESTDB/archivelog
ls -al 
2022_10_07/
2022_10_08/
2022_10_09/

2022_10_10/

I am going to remove all files older then 5 hours.

find /fast_recovery_area/TESTDB/archivelog/2022*  \( -mmin +360 -a -name "*.arc" \) -exec rm {} \; > /dev/null 2>&1 

Login into DB and check the parameter:

sqlplus / as sysdbaq

col name format a32
col size_mb format 999,999,999
col used_mb format 999,999,999
col pct_used format 999

select
name,
ceil( space_limit / 1024 / 1024 /1024) size_gb,
ceil( space_used / 1024 / 1024 /1024) used_gb,
decode( nvl( space_used, 0),0, 0,
ceil ( ( space_used / space_limit) * 100) ) pct_used
from
v$recovery_file_dest
order by

name desc;

NAME                                  SIZE_GB      USED_GB  PCT_USED
-------------------------------- ------------  ------------ --------

/fast_recovery_area                     2,600        2,590       100

Increate the sieze as follow. 

NOTE: NO NEED DB RESART:

ALTER SYSTEM SET DB_RECOVERY_FILE_DEST_SIZE =3500G SCOPE=BOTH;

RMAN command required to make empty space show via sql command..

rman target /
crosscheck archivelog all;

delete noprompt force expired archivelog all;

Make empty all files older then 0ne day:

#delete noprompt archivelog all completed before 'sysdate - 1';

Or older the 6 hours:

delete noprompt archivelog all completed before 'sysdate - 6/24';

Now execute the above sql command again and check the space:

NAME                                  SIZE_MB      USED_MB PCT_USED
-------------------------------- ------------ ------------ --------

/fast_recovery_area                     3,500        2,590       74

You can use the follwing scrip to execute the RMAN commands.

delete_archivelog.sh

more delete_archivelog.sh

#!/bin/bash
date '+%Y-%m-%d  %H:%M:%S'
. /set_home_env TESTDB #set DB environment variables.
export NLS_DATE_FORMAT='yyyy/mm/dd hh24:mi:ss'
rman target / <<EOF
crosscheck archivelog all;
delete noprompt force expired archivelog all;
#delete noprompt archivelog all completed before 'sysdate - 1';
delete noprompt archivelog all completed before 'sysdate - 6/24';
EOF
date '+%Y-%m-%d  %H:%M:%S'
cd /fast_recovery_area/TESTDB/archivelog

find /fast_recovery_area/TESTDB/archivelog/* -type d -empty -print -exec rm -r {} \;

Your comments are most valuable and it would help me to come up with better posts.

Extend device using LVM

How to Extend LVM Partition with lvextend command

PURPOSE: All documents are provided on this Blog just for educational purposes only.  Please make sure that you run it in your test environment before to move on to production environment. 

Extent physical volume using LVM 

# Use  VCenter and give the disk.

ls -l /dev/disk/by-path/ <<== Scan the correct scsi device

echo 1 > /sys/class/scsi_device/0\:0\:3\:0/device/rescan

vgdisplay

fdisk -l

...

...

   Device Boot      Start         End      Blocks   Id  System

/dev/sdc1            2048   209715199   104856576   83  Linux

...

...

partprobe

fdisk /dev/sdc <<== With the command  another disk is recognized. Example: sdc1 or  sdc2 recognized

n              #n   add a new partition
p              #p   print the partition table
enter
enter
enter
w              #w   write table to disk and exit
partprobe

fdisk -l

...

...

   Device Boot      Start         End      Blocks   Id  System

/dev/sdc1            2048   209715199   104856576   83  Linux

/dev/sdc2       209715200   419430399   104857600   83  Linux

...

...

pvscan

PV /dev/sdc1   VG vg_data         lvm2 [<100.00 GiB / 0    free]

PV /dev/sdc2                      lvm2 [100.00 GiB]

pvcreate /dev/sdc2    <<== sdc2 is a new disk
pvscan

vgs

  VG      #PV #LV #SN Attr   VSize    VFree

  vg_data   1   1   0 wz--n- <100.00g    0

vgextend vg_data /dev/sdc2

vgs

  VG      #PV #LV #SN Attr   VSize   VFree

  vg_data   2   1   0 wz--n- 199.99g <100.00g

lvextend -l +100%FREE /dev/mapper/vg_data-lv_data

xfs_growfs /data

Done:

-------------------

Steps for Physical Host extend LVM File system with multipath.

rescan-scsi-bus.sh -a -w -m

multipath -ll

#LUN WWID finden. You do with pipe

lsscsi -i -s 

vgdisplay

lvdisplay

vi /etc/multipath.conf  # add new LUN ID 

service multipathd reload

multipath -ll

parted /dev/mapper/tst-03DATA_03

GNU Parted 3.1

Using /dev/mapper/tst-01DATA_03

Welcome to GNU Parted! Type 'help' to view a list of commands.

(parted) mklabel gpt

(parted) mkpart tst-03DATA_03 2048s 100%

(parted) align-check opt 1

1 aligned

(parted) quit

ll /dev/mapper/

pvcreate /dev/mapper/tst-03DATA_03p1

You can use multiple PV in one command.

pvcreate /dev/mapper/xxx /dev/mapper/xxx

pvscan

vgs

vgextend vg_data /dev/mapper/tst-03DATA_03p1

You can as well as extend multiple VG as one command  

vgextend /dev/mapper/xxx /dev/mapper/xxx

lvextend --resizefs -l +100%FREE /dev/vg_data/lv_data

df -hl

Done

Your comments are most valuable and it would help me to come up with better posts.

 

Create new xfs Filesystem

Add a new Hard Disk to Linux

How do I mount a disk in XFS

PURPOSE: All documents are provided on this Blog just for educational purposes only.  Please make sure that you run it in your test environment before to move on to production environment. 

# First assign a disk via VCenter

# Now we can add and mount new assign disk to the Linux system.

# To find which host bus number is relevant.

grep mpt /sys/class/scsi_host/host?/proc_name

/sys/class/scsi_host/host0/proc_name:mptspi   <<== this ist the output

# Scan scsi host device 0. 

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

# Now you should be able to see the new Disk.

 

fdisk -l

mkfs.xfs /dev/sdb

mkdir /data

mount /dev/sdb /data

df -hl

# Add the entry in the fstab file

vi /etc/fstab

/dev/sdb    /data     xfs     defaults        0 0

Done.

If you want to create ext4 file system. Please use the following steps:

fdisk -l

fdisk /dev/sdc

n

enter

enter 

enter 

p

mkfs.ext4 /dev/sdc1 

blkid

vi /etc/fstab

UUID=832d4328-3dde-4861-b57b-06ce2be7245g       /data        ext4    defaults        0 0

Your comments are most valuable and it would help me to come up with better posts.