Files can also have attributes that are expressed in another way than the permissions we have seen so far. An example of this is making a file immutable (a fancy word, which means it cannot be changed). An immutable file still has normal ownership and group and RWX permissions, but it will not allow the […]
Archives for July 2020
How to Enable a Database Trigger
Database triggers are PL/SQL code that executes based on event in the database. A trigger is an Oracle statement (or a group of statements enclosed within BEGIN and END statements) that are automatically executed by Oracle in response to any of these statements: ALTER CREATE DROP DELETE INSERT UPDATE The last three are of the […]
When to use rescan-scsi-bus.sh -i (LIP flag) in CentOS/RHEL
The “rescan-scsi-bus.sh” can be used to scan new LUNs in a CentOS/RHEL machine. When ‘rescan-scsi-bus.sh -i’ is run, script execute as well a LIP_RESET (ISSUE_LIP) which may cause a disruption in I/O on the server and even cause an outage in case of a system running on heavy load. What is LIP (Loop Initialization Protocol)? […]
How to Disable rpc.quotad Service in CentOS/RHEL 6 and 7
This post explains how to disable rpc.quotad service on CentOS/RHEL 6 or 7 machines. The protocol used by rpc.rquotad is an unsecured and obsolete protocol and should be disabled. Note: This procedure can disrupt NFS clients relying on disk quotas. To avoid issues, schedule a maintenance outage and stop these NFS clients. For CentOS/RHEL 6 […]