sqlplus and rman and other binary executable are not working with error while loading shared libraries: libclntshcore.so.12.1: cannot open shared object file: No such file or directory

Issue:

sqlplus and rman and other binary executable are not working with error while loading shared libraries: libclntshcore.so.12.1: cannot open shared object file: No such file or directory

 
Error Message:

/orasw/oracle/product/12.1.0.2/db/bin/sqlplus: error while loading shared libraries: libclntshcore.so.12.1: cannot open shared object file: No such file or directory

/orasw/oracle/product/12.1.0.2/db/bin/rman: error while loading shared libraries: libclntshcore.so.12.1: cannot open shared object file: No such file or directory

[oracle@oracledb lib]$ sqlplus / as sysdba

sqlplus: error while loading shared libraries: libclntshcore.so.12.1: cannot open shared object file: No such file or directory

[oracle@oracledb lib]$ rman target /

rman: error while loading shared libraries: libclntshcore.so.12.1: cannot open shared object file: No such file or directory

[oracle@oracledb lib]$

Cause:

After Inverstigating found that the shared object file libclntshcore.so.12.1 was missing from the lib(/orasw/oracle/product/12.1.0.2/db/lib) location.

Solution:

[oracle@oracledb lib]$ pwd

/u01/app/oracle/product/12.2.0.1/dbhome_1/lib

[oracle@oracledb lib]$ ls -lrtr libclntshcore.so.12.1

ls: cannot access libclntshcore.so.12.1: No such file or directory

[oracle@oracledb lib]$

Copy from the existing Oracle Home and verify the file exist and has proper permission

[oracle@oracledb lib]$ ls -lrtr libclntshcore.so.12.1

-rwxr-xr-x. 1 oracle oinstall 8032696 Sep 27 19:28 libclntshcore.so.12.1

[oracle@oracledb lib]$

[oracle@oracledb lib]$ sqlplus / as sysdba

SQL*Plus: Release 12.2.0.1.0 Production on Mon Sep 27 19:29:18 2021

Copyright (c) 1982, 2016, Oracle.  All rights reserved.

Connected to:

Oracle Database 12c Enterprise Edition Release 12.2.0.1.0 - 64bit Production

SQL> Disconnected from Oracle Database 12c Enterprise Edition Release 12.2.0.1.0 - 64bit Production

[oracle@oracledb lib]$ rman target /

Recovery Manager: Release 12.2.0.1.0 - Production on Mon Sep 27 19:29:24 2021

Copyright (c) 1982, 2017, Oracle and/or its affiliates.  All rights reserved.

connected to target database: ORA12C (DBID=457334020)

RMAN>

Recovery Manager complete.

[oracle@oracledb lib]$

Regards,

Mallik