PostgreSQL has native support for using SSL connections to encrypt client/server communications for increased security.
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ASM
- Creating ASM Instance and diskgroups manually without DBCA
- 20 ASM Realtime | Interview Questions
- How to make a cold backup for database running on ASM ( using RMAN )
- Moving a Single Datafile from File System to ASM System (METHOD 1)
- Moving a Single Datafile from File System to ASM System (METHOD 2)
- Things to consider while adding new disk/ Rebalancing existing Disk Group
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Dataguard
- Dataguard Modes
- Dataguard Modes - II
- Oracle DataGuard Setup
- invalid archived log deletion policy
- recover from the Loss of a Datafile on a Standby Database ?
- MRP terminated with ORA-00600: internal error code, arguments
- Recover archive gaps in standby database - using 2 methodss
- Gap Resolution in Dataguard
- Convert Physical Standby to Snapshot Standby and Vice Versa
- Re-create Redo-logs on Standby/ Primary
- Pre-check for DataGuard switchover Process
- ORA-19815: WARNING: db_recovery_file_dest_size
- How do you purge old archivelogs which are applied on Standby DB
- Pre-check For SWITCHOVER using DG Broker
- https://oracle-dba-help.blogspot.com/2016/03/data-guard-modes.html
- ORA-01274 : RENAME THE UNKNOW FILE IN THE STANDBY DATABASE
- Database Creation in Easy 6 Steps
- Oracle Networking
- Tablespace management
- Housekeep : Quick Tips for DBA
- Health check for DB
- ORA-12537 While Connecting To Database Via Listener
- How to identify the applied patche-set of your Oracle Home
- Accessing a schema without knowing the password
- ORA-12505: TNS:listener does not currently know of SID given in connect descriptor
- Session Related Scripts
- How to check ORA Error on DB Server – Beginner Tip
- Working with Redo Logs
- Decommission of Oracle Database
- Roles in Oracle - Managing Users
- Oracle Release Number Format
- Troubleshooting Handy-Guide
- Understanding the Upgradation Process
- Query to find the session creating more redo
- Audit in Oracle
- Troubleshooting Internal Errors and Error-Look-up Tool on MOS
- Troubleshooting Issues with Undo Tablespace
- User Management
- User Management - II
- Data Pump Gets Better
- MEMORY_TARGET Parameter
- Installing PostgreSQL Server on CentOS, RHEL 6 / 7 Systems
- Creating a database in Postgres
- Initialize multiple Postgres instance on the same RHEL server
- How to stop starting of clusters while starting up services
- Setup a streaming replication
- Switchover- master server and warm standby (with streaming replication)
- All About Physical Replication and Log shipping
- PostgreSQL Upgrade and troubleshooting
- Timeline Switch issue
- Query to identify the lag in replication
- Drop table : ERROR: must be owner of relation table_name
- PgBadger
- PgCenter
- PgTune
- Internals of Toast Table
- Influencing Query Execution Plan
- Create Extension ERROR
- Find Uptime in PostgreSQL
- Set DB Timezone
- Clear RAM Cache, Buffer
- Read-Only User in Postgres
- Everything you need to know about Streaming Replication
- Ora2Pg Migrate Oracle to Postgres
- Total Page Cost
- PostgreSQL 13 - Everything you need to know
- Startup Failure - .conf file
- All About Postgres Upgrade
- Basic Guide
- Session Related Scripts
- AWR :: Beginners Guide
- All About ASH - Active Session History
- Wait Events : checkpoint busy waits or archiver busy waits
- Find sessions performing sort operations : TEMP Tablespace occupants
- Generate ADDM task and generate its report for Tuning
- Database Performance Tuning Scripts -Keep Handy
- Buffer Busy Wait
- Simulating the Deadlock
- Latches
- Steps to Schedule any RMAN Jobs In Windows Server
- ORA-01194: file 1 needs more recovery to be consistent
- Loss of Current Online Redo-Log
- RMAN "baby Steps"
- Recovery of ControlFiles
- Loss of Datafile
- Recovery from complete loss of all online redo log files
- Block Change Tracking
- RMAN Questions
- Instance Recovery
- Redundancy and Recovery window in RMAN
- Cold Backup
- Database Cloning
- Contact
- Drop Database using RMAN
- PITR to older Incarnation
Wednesday 23 June 2021
Saturday 19 June 2021
Installation and setting up Postgres 13 on RHEL
Official documentation : https://www.postgresql.org/download/linux/redhat/
Friday 4 June 2021
Uncommitted transactions in Oracle
Lets assume that we have an update, insert or delete statement that running but has not been committed yet. So question is how to show uncommitted transactions ?
Friday 28 May 2021
Read the sqlnet trace files
While troubleshooting sqlnet issue a week back and we used very same article to read trace files. It was very useful.
Friday 21 May 2021
Open Oracle Database with Delay Option
Found an interesting event, that helps to open the database with delay option. The event db_open_begin delay (opening database with delay) is undocumented event ( read unsupported )
Wednesday 5 May 2021
PostgreSQL Basic & Required Parameter Setting
Friday 15 January 2021
Is it possible to view database performance information without DBA privilege in Oracle 11g?
The DBA can grant you SELECT privileges to the V$ performance views. It's good for instance tuning, but not as effective as SQL Trace or ADVISOR privilege for query tuning.
Friday 1 January 2021
How to kill own Oracle SQL sessions without DBA privileges?
To successfully run an ALTER SYSTEM command, you don't need to be the DBA, but you do need the ALTER SYSTEM privilege to be granted to you (or to the "user" owning the application through which you connect to the database - which may be different from "you" as the "user" ).
Saturday 26 December 2020
Wednesday 23 December 2020
Postgresql Database Starts with 100% CPU processes ?
If you have a problem with PostgreSQL, it starts some processes that consume lots of resources. You kill those processes but they will restart after a few minutes.
Later you check the /var/log but there is nothing about this. What does that mean?😟
Saturday 19 December 2020
Thursday 17 December 2020
Postgres High Availability Terms
What is High Availability?
It is the amount of time that a service is available and is usually defined by the business.
Saturday 12 December 2020
Friday 11 December 2020
Possible ways to recover space from deleted rows with insufficient disk space remaining for full vacuum
A recent scenario,
We had a single table with about 50M records that use around 80gb of space. Application recently deleted older records which was no longer needed reducing the Number of records to 30M.