How to stop and control .bdb file generation on oracle rac

Step 1. Stop the Cluster Health Monitor resource ora.crf as grid owner
[grid@rac1 ~]$crsctl stop res ora.crf -init
CRS-2673: Attempting to stop 'ora.crf' on 'rac1'
CRS-2677: Stop of 'ora.crf' on 'rac1' succeeded

Step 2. Remove the huge CHM(.bdb) files
The file can only be removed by the root user as it is owned by root.

$cd $GI_HOME/crf/db/[nodename]
$rm -rf *.bdb
Example:
[root@rac1 ~]$cd /app/grid/11.2.0.4/crf/db/rac1
[root@rac1]$rm -rf  *.bdb

Step 3. Start the Cluster Health Monitor resource ora.crf
[grid@rac1 ~]$crsctl start res ora.crf -init
CRS-2672: Attempting to start 'ora.crf' on 'rac1'
CRS-2676: Start of 'ora.crf' on 'rac1' succeeded

Step 4. To control .bdb file generation
run below command through grid user.it allowed to change Cluster Health Monitor repository size
$ oclumon manage -repos resize 259200
rac1 --> retention check successful
rac2 --> retention check successful
New retention is 259200 and will use 4524595200 bytes of disk space

ORA-12514 error on RAC environment

Hello

i faced ORA-12514 error on RAC environment.

i am able to tnsping but while connecting to db i got below error:

ORA-12514: TNS:listener does not currently know of service requested in connect descriptor

Solution:

1) Check tnsnames service and node tnsnames.ora service,port should be same.

2) listener and both node should be up and running.

3) user below command from sys or system users.

alter system set remote_listener='<scanname>:<port>';

Example:

alter system set remote_listener='rac-scan.sigmasys.net:1521';