"lsnrctl: symbol lookup error: lsnrctl: undefined symbol: nlgh" while starting Oracle Database listener

After Applying PSU, database listener failed to start with below error

 $ lsnrctl start testdb
lsnrctl: symbol lookup error: lsnrctl: undefined symbol: nlgh


Solution
==========
1.Relink network executables using below command

$  make -kf ins_net_server.mk install
/bin/chmod 755 /testdb/oracle/product/11204/bin/
 - Linking tnslsnr
rm -f tnslsnr
gcc -o tnslsnr -m64 -z noexecstack -L/testdb/oracle/product/11204/network/lib/ -L/testdb/oracle/product/11204/lib/ -L/testdb/oracle/product/11204/lib/stubs/  /testdb/oracle/product/11204/network/lib/s0nsgl.o /testdb/oracle/product/11204/network/lib/snsglp.o -lclntsh  `cat /testdb/oracle/product/11204/lib/ldflags`    -lncrypt11 -lnsgr11 -lnzjs11 -ln11 -lnl11 -lnro11 `cat /testdb/oracle/product/11204/lib/ldflags`    -lncrypt11 -lnsgr11 -lnzjs11 -ln11 -lnl11 -lnnz11 -lzt11 -lztkg11 -lclient11 -lnnetd11  -lvsn11 -lcommon11 -lgeneric11 -lmm -lsnls11 -lnls11  -lcore11 -lsnls11 -lnls11 -lcore11 -lsnls11 -lnls11 -lxml11 -lcore11 -lunls11 -lsnls11 -lnls11 -lcore11 -lnls11 `cat /testdb/oracle/product/11204/lib/ldflags`    -lncrypt11 -lnsgr11 -lnzjs11 -ln11 -lnl11 -lnro11 `cat /testdb/oracle/product/11204/lib/ldflags`    -lncrypt11 -lnsgr11 -lnzjs11 -ln11 -lnl11 -lclient11 -lnnetd11  -lvsn11 -lcommon11 -lgeneric11   -lsnls11 -lnls11  -lcore11 -lsnls11 -lnls11 -lcore11 -lsnls11 -lnls11 -lxml11 -lcore11 -lunls11 -lsnls11 -lnls11 -lcore11 -lnls11 -lclient11 -lnnetd11  -lvsn11 -lcommon11 -lgeneric11 -lsnls11 -lnls11  -lcore11 -lsnls11 -lnls11 -lcore11 -lsnls11 -lnls11 -lxml11 -lcore11 -lunls11 -lsnls11 -lnls11 -lcore11 -lnls11   `cat /testdb/oracle/product/11204/lib/sysliblist` -Wl,-rpath,/testdb/oracle/product/11204/lib -lm    `cat /testdb/oracle/product/11204/lib/sysliblist` -ldl -lm   -L/testdb/oracle/product/11204/lib -lons -lnl11  -ln11 -lnlsnr11 -lnlsnrc11 -lnsgr11 -lnms -lncm11 -lnmsp -lpeer -lnro11 -ln11   -lnl11 -lnlsnr11 -lnlsnrc11 -lnms -lncm11 -lnmsp -ln11     -lm
mv -f /testdb/oracle/product/11204/bin/tnslsnr /testdb/oracle/product/11204/bin/tnslsnr0
mv tnslsnr /testdb/oracle/product/11204/bin/tnslsnr
/bin/chmod 751 /testdb/oracle/product/11204/bin/tnslsnr
 - Linking lsnrctl
rm -f lsnrctl
gcc -o lsnrctl -m64 -z noexecstack -L/testdb/oracle/product/11204/network/lib/ -L/testdb/oracle/product/11204/lib/ -L/testdb/oracle/product/11204/lib/stubs/  /testdb/oracle/product/11204/network/lib/s0nsglc.o -lclntsh  `cat /testdb/oracle/product/11204/lib/ldflags`    -lncrypt11 -lnsgr11 -lnzjs11 -ln11 -lnl11 -lnro11 `cat /testdb/oracle/product/11204/lib/ldflags`    -lncrypt11 -lnsgr11 -lnzjs11 -ln11 -lnl11 -lnnz11 -lzt11 -lztkg11 -lclient11 -lnnetd11  -lvsn11 -lcommon11 -lgeneric11 -lmm -lsnls11 -lnls11  -lcore11 -lsnls11 -lnls11 -lcore11 -lsnls11 -lnls11 -lxml11 -lcore11 -lunls11 -lsnls11 -lnls11 -lcore11 -lnls11 `cat /testdb/oracle/product/11204/lib/ldflags`    -lncrypt11 -lnsgr11 -lnzjs11 -ln11 -lnl11 -lnro11 `cat /testdb/oracle/product/11204/lib/ldflags`    -lncrypt11 -lnsgr11 -lnzjs11 -ln11 -lnl11 -lclient11 -lnnetd11  -lvsn11 -lcommon11 -lgeneric11   -lsnls11 -lnls11  -lcore11 -lsnls11 -lnls11 -lcore11 -lsnls11 -lnls11 -lxml11 -lcore11 -lunls11 -lsnls11 -lnls11 -lcore11 -lnls11 -lclient11 -lnnetd11  -lvsn11 -lcommon11 -lgeneric11 -lsnls11 -lnls11  -lcore11 -lsnls11 -lnls11 -lcore11 -lsnls11 -lnls11 -lxml11 -lcore11 -lunls11 -lsnls11 -lnls11 -lcore11 -lnls11   `cat /testdb/oracle/product/11204/lib/sysliblist` -Wl,-rpath,/testdb/oracle/product/11204/lib -lm    `cat /testdb/oracle/product/11204/lib/sysliblist` -ldl -lm   -L/testdb/oracle/product/11204/lib -lnl11  -ln11 -lnlsnr11 -lnlsnrc11 -lnsgr11 -lnms -lncm11 -lnmsp -lpeer -lnro11 -ln11   -lnl11 -lnlsnr11 -lnlsnrc11 -lnms -lncm11 -lnmsp -ln11     -lm
mv -f /testdb/oracle/product/11204/bin/lsnrctl /testdb/oracle/product/11204/bin/lsnrctl0
mv lsnrctl /testdb/oracle/product/11204/bin/lsnrctl
/bin/chmod 751 /testdb/oracle/product/11204/bin/lsnrctl


2. Restart Database Listener

$ lsnrctl start testdb

LSNRCTL for Linux: Version 11.2.0.4.0 - Production on 16-MAY-2016 02:00:20

Copyright (c) 1991, 2013, Oracle.  All rights reserved.

Starting /testdb/oracle/product/11204/bin/tnslsnr: please wait...

TNSLSNR for Linux: Version 11.2.0.4.0 - Production
System parameter file is /testdb/oracle/product/11204/network/admin/testdb/listener.ora
Log messages written to /testdb/log/network/testdb.log
Listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=dblocalhost)(PORT=1523)))

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=dblocalhost)(PORT=1523)))
STATUS of the LISTENER
------------------------
Alias                     testdb
Version                   TNSLSNR for Linux: Version 11.2.0.4.0 - Production
Start Date                16-MAY-2016 02:00:20
Uptime                    0 days 0 hr. 0 min. 0 sec
Trace Level               off
Security                  ON: Local OS Authentication
SNMP                      OFF
Listener Parameter File   /testdb/oracle/product/11204/network/admin/testdb/listener.ora
Listener Log File         /testdb/log/network/testdb.log
Listening Endpoints Summary...
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=dblocalhost)(PORT=1523)))
Services Summary...
Service "testdb" has 1 instance(s).
  Instance "testdb", status UNKNOWN, has 1 handler(s) for this service...
The command completed successfully

What Happens during adop cutover Phase?

Cutover Phase Requires a brief downtime.

Following activities occur during Cutover:

+Users are logged off the system
+Finalize is run as part of cutover -if not run earlier in adop cycle
+Cutover phase cancels ADZPPATCH Concurrent Program
+Stops all Services on RUN and PATCH editions , switches filesystem and starts services on new RUN FS
+Flipping snapshots in run and patch editions.
+Users are brought back online on the patched system 

Environment is changed after cutover. Need to Re-source the env, for performing any actions after cutover.

Syntax:

$ adop phase=cutover

Multi-node Considerations
========================
By default cutover is invoked automatically on remote nodes.
If you want cutover individually:      
1. First node the cutover should be:           
$ adop phase=cutover allnodes=no       
2. For all other nodes you should do:        
$ adop phase=cutover allnodes=no action=nodb           
 * nodb because db work is already done


Cutover Parameters:
===================

mtrestart :Specifies whether or not to start Mid-Tier services at end of cutover, it allows you to perform some additional maintenance operations in the system before bringing it up.        - Takes values "yes" or "no".        - Default: yes
allnodes : Specifies whether or not to run on all the nodes.        - Takes values "yes" or "no".        - Default: yes
action: Specifies whether or not to take database action        - Takes values "db" or "nodb"        - Default: db

What is the difference between dbtechstack,dbtier and dbconfig modes in Cloning?

While Cloning Oracle Applications, adcgclone can be executed in 3 Modes on Database node.


1)perl adcfgclone.pl dbTier

 It configures the ORACLE_HOME on the target database node and  recreate the controlfiles.
 This is used in case of standby database/hot backups.   


2)perl adcfgclone.pl dbTechStack 

It configures the ORACLE_HOME on the target database tier node only. Relink the oracle home.

The below steps has to be performed manually
1. Create the Target Database control files.
2. Start the Target System Database in open mode
3. Run the library update script against the Database
cd $RDBMS_ORACLE_HOME/appsutil/install/[CONTEXT NAME]
sqlplus "/ as sysdba" @adupdlib.sql [libext]
 Where [libext] should be set to 'sl' for HP-UX, 'so' for any other UNIX platform, 
or 'dll' for Windows.

3)perl adcfgclone.pl dbconfig

It configures the database with context file. Database must be open while running adcfgclone in dbconfig mode.
e.g 
cd $RDBMS_ORACLE_HOME/appsutil/clone/bin
perl adcfgclone.pl dbconfig <Context_file>

Where Target Context File is:
$RDBMS_ORACLE_HOME/appsutil/<SID_HOSTNAME>.xml