Database administrators (DBAs) play a critical and often underappreciated role in the world of information technology.
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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
Saturday 11 November 2023
Saturday 4 November 2023
A Case Study: Oracle Database vs. PostgreSQL
Considering the best database management system for your organization? Let's explore the key differences between Oracle Database and PostgreSQL, two powerful contenders in the database landscape.
Saturday 7 October 2023
Facts: Native vs pglogical Logical Replication in PostgreSQL
Here are some of the facts about Native vs pglogical Logical Replication in PostgreSQL
Friday 29 September 2023
Agile is NOT FAST….
Agile is a widely adopted and highly effective approach to software development and project management in the IT environment. It has gained popularity for several reasons, and its principles and practices have proven to be beneficial for many organizations.
Monday 4 September 2023
Trace performance issues in PostgreSQL using the pg_stat_statements
π The pg_stat_statements view is a PostgreSQL extension that provides information about the execution statistics of all SQL statements that have been executed by the PostgreSQL server.
Sunday 6 March 2022
PostgreSQL VACUUM and MVCC
PostgreSQL uses MVCC (multi-version concurrency control) to provide transactional semantics. In the simplest form, MVCC lets each transaction work on a different copy of a row in a table. What it means is whenever a row is updated, a new version of the row is created.
Friday 4 February 2022
Tracing Oracle Data Guard
Tracing can also be enabled in dataguard using the parameter "Log_Archive_Trace"
The values can be set using DG-Broker (if configured) or at SQL prompt as below.
Saturday 15 January 2022
Feedspot - Top database blog list
Dear All,
I am pleased to inform that I received this recognition from Feedspot and I'm proud to be part of the awesome family- Thank you Anuj and Team for this recognition!
Saturday 8 January 2022
Consistency check before performing RMAN resetlogs.
The article covers consistency check before performing OPEN RESETLOGS after restoring a database using backup
Saturday 18 December 2021
12c Wallet creation and tablespace encryption
The following article describes the steps to create the wallet and perform a tablepsace encryption.
Saturday 4 December 2021
Datapump Errors and Solutions
SCOPE
The article covers common & complex error occurs during the Datapump Export and Import operations
Friday 19 November 2021
Oracle Instance Startup Failure | Instance terminated by GEN0
SCOPE
Recently a server running both Oracle databases with version 11.1.0.2 had to be forced powered cycled due to a NFS issue. Since it wasn’t possible to login to the O/S to shutdown the DBs an instance recovery was required on both the 11.2 databases.
Saturday 6 November 2021
Resmgr:Cpu Quantum | Oracle wait event
SCOPE
Application job are running slow and DBA finds out the wait event as "Resmgr:Cpu Quantum" for multiple sessions running in database.
Sunday 17 October 2021
ASM Diskspace utilization categorized by Database/File names
SCOPE
Below script helps to identify the space utilization of Databases including the files such as Datafiles, Redologfiles, Archivelog files on ASM diskgroup categorized by Database names and their files.
Saturday 2 October 2021
ORA-12519: TNS:no appropriate service handler found (followed by ORA-00020)
SCOPE
Application complains about the error ORA-12519: TNS:no appropriate service handler found while connection to the database.