Oracle : Important OS/Unix Commands for DBA’s – Part 2

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1) Bkup Tnsnames:

$ cp tnsnames.ora tnsnames.ora.date +"%Y%m%d%H%M"

-rw-r—–. 1 oracle oinstall 564 Oct 20 11:57 tnsnames.ora
-rw-r—–. 1 oracle oinstall 564 Nov 28 22:25 tnsnames.ora.201611282225

2) Crontab Backup :

$ crontab -l > crontab_orig_date '+%m%d_%H%M'

$ ls -ltr crontab*

-rw-r–r–. 1 oracle oinstall 2175 Nov 28 22:26 crontab_orig_1128_2226

3) Create copy of listener log with last N lines (for Troubleshooting)

tail -150 listener.log > listener_log_hostname_date '+%m%d_%H%M'.log

$ls -ltr
total 40716
-rw-r–r–. 1 grid oinstall 31183 Nov 28 22:29 listener_log_cloudserver1_1128_2229.log
-rw-r—–. 1 grid oinstall 3325292 Nov 28 22:29 listener.log

4) Suffix date for any OS command :

_hostname_date '+%m%d_%H%M'.log

5) Find files greater than 1 GB.

find . -size +1000000k

6) Find file

find . -name tnsnames.ora

7) Delete trace files greater than 30 Days:

### find . -name ‘*.trc’ -mtime +30 -exec rm {} \;
### find . -name ‘*.xml’ -mtime +30 -exec rm {} \;

8) Make file into null (Check the file name properly before making it null)

cp /dev/null <filename>

9) Find specific file from root

#find / -name init.ora 2> /dev/null

10) Checking telnet is working or not?

telnet <IP ADDRESS> 1521

11) Find String in Directory :

### grep -R ‘test’ /u01/app/oracle/dba

12) Find SQL Text for TOP Unix process from TOP Command:

prompt “Please Enter The UNIX Process ID”
set pagesize 50000
set linesize 30000
set long 500000
set head off
select
s.username su,
substr(sa.sql_text,1,540) txt
from v$process p,
v$session s,
v$sqlarea sa
where p.addr=s.paddr
and s.username is not null
and s.sql_address=sa.address(+)
and s.sql_hash_value=sa.hash_value(+)
and spid=&SPID;