Unable to lock central Inventory. Opatch will attempt to re-lock

D:\12.1.0.2\2016 SAP mopatch\24345625>D:\oracle\ABC\12102\OPatch\opatch apply

Oracle Interim Patch Installer version 12.1.0.1.3

Copyright (c) 2016, Oracle Corporation.  All rights reserveD.

Oracle Home       : D:\oracle\ABC\12102

Central Inventory : C:\Program Files\Oracle\Inventory

   from           : n/a

OPatch version    : 12.1.0.1.3

OUI version       : 12.1.0.2.0

Log file location : D:\oracle\ABC\12102\cfgtoollogs\opatch\24345625_Dec_15_2016_20_32_12\apply2016-12-15_20-32-12PM_1.log

Applying interim patch '24345625' to OH 'D:\oracle\ABC\12102'

Verifying environment anD performing prerequisite checks...

Unable to lock Central Inventory.  OPatch will attempt to re-lock.

Do you want to proceeD? [y|n]

n

User ResponDeD with: N

Unable to lock Central Inventory.  Stop trying per user-request?

OPatchSession cannot loaD inventory for the given Oracle Home D:\oracle\ABC\12102. Possible causes are:

   No reaD or write permission to ORACLE_HOME/.patch_storage

   Central Inventory is lockeD by another OUI instance

   No reaD permission to Central Inventory

   The lock file eDists in ORACLE_HOME/.patch_storage

   The Oracle Home Does not eDist in Central Inventory

OPatch faileD: ApplySession faileD to prepare the system. Unable to lock Central Inventory.  Stop trying per user-request?

Log file location: D:\oracle\ABC\12102\cfgtoollogs\opatch\24345625_Dec_15_2016_20_32_12\apply2016-12-15_20-32-12PM_1.log

OPatch faileD with error coDe = 22

Soln:- In WinDows: C:\Program Files\Oracle\Inventory\ContentsDML

Right click on Directory=>properties=>Security=>select full control for your winDows user.

In UniD or LinuD: /oracle/oraInventory/ContentsDML

We neeD to grant 777 to ContentsDML

Note:- Sometime we have need to provide full control over C:\Program files\Oracle

Fix Opatch: Missing command :fuser Prerequisite check :CheckSystemCommandAvailable" Failed 

Error :

Opatch failed with following error message

Missing command :fuser

Prerequisite check "CheckSystemCommandAvailable" failed.

Solution Description:

Go to patch $ORACLE_HOME/bin directory. If we are applying the patch 

to Grid home then we need to go $GRID_HOME/bin or if you are applying to 

Oracle Home then go to $ORACLE_HOME/bin and create a file with name fuser. This will solve your issue.

cd $ORACLE_HOME/bin

touch fuser

chmod 755 fuser

ls -tlr fuser

-rwxr-xr-x 1 oracle oinstall 12 Dec 30 11:51 fuser