- 11 Jun, 2019
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Basic Unix Command for Oracle DBA
In this video you will understand the use of unix command for daily dba life. you will find this command useful while while working on dba environment.
1. To Cleanup trace files more than n days old
$ find $DBA/$ORACLE_SID/bdump/*.trc -mtime +n -exec rm {} \;
2. To get the value of all environment variables.
$ env
3. To find all files that end with “log” in directory /ora0/admin
$ find /ora0/admin -name “*log” -print
4. To send mails from the server
To mail the contents of message.log to xyz and abc with a subject.
$ mail -s “Messages from Me” “[email protected]” “[email protected]” < message.log
$ uuencode awrrpt_1_2545_2546.txt awrrpt_1_2545_2546.txt |mailx -s “awr” [email protected]
5. To see errors from Alert log file
$ cd alertlogdirectory
$ grep ORA- alertSID.log
6. To see the latest 20 lines in the Alert log file
$ tail -20 alertSID.log
To see the first 20 lines in the Alert log file
$ head -20 alertSID.log
8.To remove ^M character in a file and write the new contents in another tempfile.
$ sed -e ‘s/^M$//’ filename > tempfile
9. Details of the Server
$ uname -a
10. File System Information
$ df -k (in kb)
$ df -h (in gb)
11. Last Reboot Time of the server
$ who -b
12. Memory Size on Server
$ /usr/sbin/prtconf |grep “Memory size”
13. Swap Space on Server
$ /usr/sbin/swap -s
14. Number of CPUs on server
$ /usr/sbin/psrinfo
$ cat /proc/cpuinfo | grep processor (Solaris)
15. Top CPU consuming processes
$ top
$ prstat -J (Used in Solaris)
$ topaz (Used in AIX)
16.To get the users currently logged in
$ who
To get the details of the user as whom I have logged in
$ who am i
17. To change certain terminal characteristics.
For erasing using <backspace> . In some settings, entering backspace may return garbage values. To avoid this use:
$stty erase ^?
18. Terminal and disk I/O activity and CPU utilization
$ iostat -xtc 5 2
Time: 08:46:51 PM
avg-cpu: %user %nice %sys %iowait %idle
4.26 0.00 1.45 2.87 91.42
19. To get virtual memory statistics.
$ vmstat 5
procs ———–memory———- —swap– —–io—- –system– —-cpu—-
r b swpd free buff cache si so bi bo in cs us sy id wa
0 0 8 1061668 1094224 7348112 0 0 1625 257 0 0 4 1 91 3
20. To get network-related information.
$ netstat -rn
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
172.168.1.3 0.0.0.0 255.255.255.255 UH 0 0 0 ppp0
172.168.1.3 172.168.1.5 255.255.255.255 UGH 0 0 0 ppp0
172.168.1.2 0.0.0.0 255.255.255.255 UH 0 0 0 ppp1
172.168.1.2 172.168.1.4 255.255.255.255 UGH 0 0 0 ppp1
174.12.3.32 0.0.0.0 255.255.255.240 U 0 0 0 bond0
179.254.0.0 0.0.0.0 255.255.0. U 0 0 0 bond0
0.0.0.0 164.12.3.46 0.0.0.0 UG 0 0 0 bond0
20. Displays today’s CPU activity so far
$ sar -u 5 5 (Used in Linux)
08:51:50 PM CPU %user %nice %system %iowait %idle
08:51:55 PM all 0.87 0.00 0.69 0.71 97.73
08:52:00 PM all 4.66 0.00 1.62 0.93 92.80