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Free Learning Resources
Video Demonstrations
Watch expert-led demos on Oracle & PostgreSQL concepts. New videos added weekly.
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Oracle48:22
Oracle Architecture Deep Dive: SGA, PGA & Background Processes
👁 12.4K views📅 2 weeks ago
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Oracle1:12:05
RMAN Backup & Recovery — Complete Hands-On Guide
👁 18.7K views📅 1 month ago
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Oracle55:18
Oracle RAC 19c Installation Step-by-Step on VirtualBox
👁 9.2K views📅 3 weeks ago
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Oracle42:50
Oracle Performance Tuning using AWR, ASH & ADDM Reports
👁 7.8K views📅 1 month ago
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PostgreSQL38:15
PostgreSQL 16 Installation & Configuration on Linux
👁 15.1K views📅 2 weeks ago
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PostgreSQL52:40
PostgreSQL Streaming Replication — Setup & Failover with repmgr
👁 11.3K views📅 3 weeks ago
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PostgreSQL1:08:22
Patroni HA Cluster Setup with etcd & HAProxy — Full Demo
👁 6.4K views📅 1 month ago
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PostgreSQL45:30
PostgreSQL Query Optimization & Execution Plan Analysis
Undo management is one of the most misunderstood aspects of Oracle DBA. In this article, we dive deep into how Oracle manages undo data, what causes the dreaded ORA-01555 Snapshot Too Old error, and how to configure undo retention properly for OLTP workloads.
PostgreSQL
PostgreSQL VACUUM Explained: Preventing Table Bloat & Transaction ID Wraparound
Learn why VACUUM is not optional in PostgreSQL, how autovacuum works under the hood, what causes table and index bloat, and how to monitor and tune autovacuum for high-transaction databases.
Oracle
Oracle AWR Deep Dive: Reading and Acting on Automatic Workload Repository Reports
AWR reports are the gold standard for Oracle performance troubleshooting. This guide teaches you to read every section of an AWR report — Top SQL, Wait Events, Time Model, Instance Efficiency — and translate findings into actionable tuning steps.
PostgreSQL
Logical Replication in PostgreSQL 16: Setup, Limitations & Use Cases
Logical replication allows selective table replication and cross-version replication. We cover how to set up publisher-subscriber architecture, understand replication slots, handle conflicts, and use logical replication for zero-downtime major version upgrades.
General
Oracle vs PostgreSQL: Choosing the Right Database for Your Enterprise in 2025
A comprehensive comparison of Oracle and PostgreSQL from a DBA perspective — licensing costs, feature parity, performance characteristics, migration considerations, and why many enterprises are now running both in hybrid environments.
Oracle
Oracle DataGuard Broker: Simplifying Switchover and Failover Operations
DataGuard Broker automates complex switchover and failover procedures. This article walks through DGMGRL configuration, setting up observer for fast-start failover, and the key properties that control Data Guard behavior in production.
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Hands-On Practice
Lab Exercises
Step-by-step lab guides to practice Oracle & PostgreSQL administration skills on your own system.
Beginner
Lab 01: Oracle 19c Installation on Linux
Install Oracle Database 19c on Oracle Linux 8, configure prerequisites, run OUI, and verify successful installation.
1
Configure kernel parameters & OS prerequisites
2
Create oracle user, groups, and directories
3
Run Oracle Universal Installer (GUI/silent)
4
Create listener and database using DBCA
Beginner
Lab 02: Tablespace & User Management
Create permanent, temporary, and undo tablespaces. Manage users, profiles, roles, and system/object privileges.
1
Create various tablespace types
2
Add datafiles and resize tablespaces
3
Create users with custom profiles
4
Assign roles and object privileges
Intermediate
Lab 03: RMAN Full & Incremental Backup
Configure RMAN, set up recovery catalog, perform full and level 0/1 incremental backups, and restore from backup.
1
Configure RMAN retention policy & channels
2
Perform full database backup to disk
3
Schedule level 0 & level 1 incremental backups
4
Restore & recover from backup
Intermediate
Lab 04: AWR Report Generation & Analysis
Generate AWR snapshots manually, produce AWR/ADDM reports, identify top SQL and wait events, and implement fixes.
1
Create and manage AWR snapshots
2
Generate HTML AWR report via awrrpt.sql
3
Analyze top-5 wait events and top SQL
4
Create tuning recommendations from ADDM
Advanced
Lab 05: Oracle DataGuard Physical Standby
Create a physical standby database using RMAN DUPLICATE, configure log shipping, test switchover and failover.
1
Prepare primary for DataGuard (archivelog, force logging)
2
Create standby using RMAN DUPLICATE FROM ACTIVE
3
Configure DG Broker & verify redo apply
4
Perform controlled switchover using DGMGRL
Advanced
Lab 06: Oracle RAC Two-Node Cluster
Set up a 2-node Oracle RAC cluster on VirtualBox with ASM shared storage, test instance failover and load balancing.
1
Network setup (public, private, SCAN VIPs)
2
Install Grid Infrastructure (CRS/ASM)
3
Create ASM diskgroups and RAC database
4
Test TAF, node eviction, and node rejoin
Beginner
Lab 01: PostgreSQL 16 Installation & Setup
Install PostgreSQL 16 on RHEL/Ubuntu, configure postgresql.conf, pg_hba.conf, and manage the service.
1
Install from official PostgreSQL yum/apt repo
2
Initialize data cluster and start service
3
Configure listen_address, port, max_connections
4
Setup pg_hba.conf for md5 authentication
Beginner
Lab 02: Roles, Schemas & Privileges
Create roles, grant and revoke privileges, manage schema-level access, and understand the PostgreSQL privilege model.
1
Create login roles and group roles
2
Grant database and schema privileges
3
Set default privileges with ALTER DEFAULT PRIVILEGES
4
Implement row-level security (RLS)
Intermediate
Lab 03: Streaming Replication Setup
Configure primary and standby servers for streaming replication, monitor replication lag, and test failover.
1
Enable WAL replication on primary
2
Create base backup using pg_basebackup
3
Configure standby.signal & primary_conninfo
4
Monitor using pg_stat_replication
Intermediate
Lab 04: Table Partitioning
Implement range, list, and hash partitioning. Manage partition maintenance, pruning, and partition-wise joins.
1
Create range-partitioned table by date
2
Add, detach, and drop partitions
3
Verify partition pruning with EXPLAIN
4
Implement global and local indexes
Advanced
Lab 05: Patroni HA Cluster
Build a 3-node Patroni cluster with etcd DCS, pgBouncer connection pooling, and HAProxy for transparent failover.
1
Install and configure etcd cluster
2
Configure Patroni YAML on all nodes
3
Setup HAProxy for read/write routing
4
Simulate leader failure & test auto-failover
Advanced
Lab 06: Query Optimization & EXPLAIN ANALYZE
Analyze slow queries with EXPLAIN ANALYZE, understand node types, and optimize using index strategies and query rewrites.
1
Enable pg_stat_statements extension
2
Identify top slow queries
3
Read execution plans — seq scan vs index scan
4
Create partial, composite & covering indexes
Interview Preparation
Interview Questions & Answers
500+ real interview questions asked at top IT companies. Click each question to reveal the expert answer.
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