Oracle database administration tutorial( Oracle DBA)

Introduction to Oracle database administration(Oracle DBA)

An Oracle DBA (Database Administrator) is responsible for managing and maintaining Oracle databases. The role of an Oracle DBA is critical to the smooth operation of databases that support various applications and services within an organization

The key responsibilities of an Oracle DBA (Database Administrator) encompass a wide range of tasks focused on ensuring the reliability, performance, and security of Oracle databases. Here are the primary responsibilities:

(1)Database Installation and Configuration

• Installation: Install Oracle database software and related tools.
• Configuration: Set up databases, configure database instances, and adjust parameters to optimize performance for specific use cases.

(2) Database Design and Architecture

• Schema Design: Create and maintain database schemas, tables, indexes, views, and other database objects.
• Capacity Planning: Plan for future database growth and ensure the database infrastructure can handle increased loads.

(3) Performance Monitoring and Tuning

• Monitoring: Continuously monitor database performance using tools like Oracle Enterprise Manager, AWR (Automatic Workload Repository), and ADDM (Automatic Database Diagnostic Monitor).
• Tuning: Optimize SQL queries, adjust memory allocation, and tweak other database parameters to ensure optimal performance.

(4) Backup and Recovery Management

• Backup Strategy: Develop and implement a robust backup strategy to protect data against loss.
• Recovery: Perform database recovery operations in case of data loss, corruption, or system failure using RMAN (Recovery Manager) and other tools.

(5)Security Management

• User Management: Manage database users, roles, and permissions to ensure secure access control.
• Security Policies: Implement security measures such as encryption, auditing, and patching to protect sensitive data and ensure compliance with regulations.

(6) Patch Management and Upgrades

• Patching: Apply patches to the Oracle database software to fix bugs, address security vulnerabilities, and enhance features.
• Upgrades: Plan and execute database upgrades to newer versions, ensuring minimal downtime and data integrity during the process.

(7) Disaster Recovery Planning

• DR Planning: Develop and maintain disaster recovery plans, including setting up DataGuard or other replication solutions to ensure high availability and data redundancy.
• Testing: Regularly test disaster recovery procedures to ensure they work as intended in an actual disaster scenario.

(8) Troubleshooting and Problem Resolution

• Issue Diagnosis: Diagnose and resolve database issues such as performance bottlenecks, connectivity problems, and data corruption.
• Support: Provide support for developers and other teams that rely on the database, assisting with query optimization and other database-related tasks.

(9) Automation and Scripting

• Automation: Automate routine tasks such as backups, monitoring, and report generation using shell scripts, PL/SQL, or other tools.
• Scripting: Develop and maintain scripts to facilitate database administration tasks.

(10) Coordination with Other Teams

• Collaboration: Work closely with other IT teams, such as system administrators, network engineers, and developers, to ensure the database integrates seamlessly with the overall IT infrastructure.

These responsibilities highlight the critical role an Oracle DBA plays in ensuring that the database environment is secure, efficient, and capable of supporting the organization’s data needs.

Oracle DBA Tutorials

Here is a list of Oracle DBA tutorials, providing detailed insights essential for anyone aspiring to build a career as a DBA.

This page offers links to comprehensive content on Oracle database administration, making it a valuable resource whether you’re an experienced DBA or looking to become one.

Section 1:Oracle Database Core Concepts

1. Oracle Database and Oracle Instance
2. Oracle Shared Pool
3. Result cache in 11g
4. Oracle Shutdown
5. Oracle Multitenant Architecture
6. Oracle Container Database (CDB) and Pluggable Database (PDB)
7. How to Create Container Database
8. How to Create Pluggable Database
9. Step-by-Step Oracle 12c Database Installation on Linux
10. How to drop the oracle database

Section 2: Oracle Administration Tasks

1. How to create tablespace in Oracle
2. Drop a datafile in Oracle
3. add datafile in Oracle
4. how to check tablespace in Oracle
5. shrink the datafile in Oracle
6. How to check temp tablespace in Oracle
7. How to find archive log history
8. How to recreate redo log files
9. How to check alert log errors in Oracle
10. create spfile from pfile
11. alter system switch logfile v/s archive log current
12. how to find the semaphore for the Database instance
13. ORAPWD

Section 3: Locks & Latches

1. Queries to check locks in the Oracle database
2. Oracle locks
3. Latch in oracle

Section 4: Monitoring and Health Check

1. Reserved keywords in Oracle
2. Oracle Database Health check
3. How to find how much space is actually used by the lob segments
4. How to delete duplicate rows from a table?
5. How to check the degree of parallelism in Oracle
6. How to check parallel sessions in Oracle
7. How to monitor transaction Rollback Progress
8. How to move LOB data to another tablespace
9. How to find metadata of any objects in Oracle
10. How to find a table whose statistics are locked
11. Why pinning objects into the shared pool?
12. How to find the database session for JVM PID
13. How to find the High Water mark of the Oracle Table
14. Automatic Workload Repository
15. how to find the Oracle database version
16. Timezone settings
17. How to Get Materialized View’s Definition and monitor it

Section 5: Users, Roles and Grant

• Create Users and Roles in Oracle database 12c
• How to grant access to v$ views
• How to Login as a user without changing the password in the Oracle database
• How to use the Oracle logon trigger to stop login from a Particular program

Section 6: Database Patching

1. Opatch help
2. How to run Opatch in non-interactive form
3. PSU patch and How to verify the PSU update in the Oracle Home and database

Section 7:Oracle RAC Tutorial

1. Oracle database RAC
2. Instance Failure and Recovery
3. Oracle Clusterware
4. Oracle voting disk
5. How to find RAC interconnect Information
6. How to add any node to Oracle RAC cluster in 10g and 11g
7. Oracle SCAN(Single Client Access Name)
8. Virtual IP Addresses(VIP)
9. why-database-not-startup-automatic in 11gR2 cluster
10. How to Setup diag wait in the cluster
11. How to Recreate Central Inventory in Real Applications Clusters
12. Cluster command in 10g and 11g
13. Oracle Flex Cluster 12c
14. How to change Hostname for a Grid Infrastructure Oracle Restart Standalone Configuration
15. srvctl commands

Section 8: Backup and Recovery

1. What is undo and redo in Oracle
2. Introduction to Database Backup
3. Oracle database recovery
4. Oracle backup type and strategy
5. Mechanism Followed by Oracle when taking Hot backup
6. Open resetlogs checks for the database
7. Recovery Manager(RMAN)
8. How to recover database using Rman
9. RMAN Backup commands
10. RMAN List backup commands
11. How to correct error RMAN-20004
12. RMAN connection decoded
13. How to create recovery catalog and register database
14. How to debug RMAN session
15. How to identify corrupts blocks in the database
16. How to recover corrupt blocks using RMAN
17. How to delete the archive logs in Oracle

Section 9: Oracle ASM

1. Automatic Storage Management
2. Oracle ASM disks
3. Oracle ASM Diskgroups
4. ASM Best Practice to add disk to diskgroup
5. ASM metadata
6. What is raid
7. How ASM Failure Groups and CSS provides high availability
8. ASM Initialization Parameters: ASM_DISKSTRING,ASM_DISKGROUPS
9. How Oracle ASM Rebalance works
10. How to move database to ASM storage
11. 15 Awesome Oracle ASM Queries every DBA must know

Section 10: Database Flashback

• Flashback Database
• Oracle database Flashback database
• Flashback PDB in Oracle Database 12c Release 2
• How to check restore point in oracle
• Oracle Flashback query
• Useful Queries for Oracle Flashback Database
• How to Flashback when we have dataguard

Section 11: Database Cloning

• How to clone Oracle Home
• Oracle Database cloning
• RMAN DUPLICATE DATABASE CLONING
• RMAN DUPLICATE DATABASE CLONING WITH ACTIVE DATABASE
• Local Undo in Oracle Database 12c R2(12.2)
• PDB Relocate in Oracle database 12c Release 2
• Hot PDB cloning in Oracle database 12.2
• How to remotely clone a PDB or non-CDB in Oracle Database 12.1
• Refreshable PDB in Oracle Database 12.2
• DBNEWID(nid) utility

Section 12: Oracle Database Miscellaneous

1. Top 10 New Features of Oracle 12c
2. Oracle announced its new Cloud-based Solaris Version 11
3. Top Oracle 12c New Features for developers
4. 5 Simple (But Important) Things To Remember About Oracle Database 12c views ,parameters and packages
5. Online move of active datafile in 12c
6. approx_count_distinct
7. Oracle Database Interactive Quick Reference Guide | 11g, 12c & 19c
8. Top Oracle Enterprise Manager 13c Features
9. Useful Oracle 12c pluggable database commands
10. Downtime Reduction during Patching
11. Recovering a Standby database from a missing archivelog
12. Oracle Advanced Queuing
13. Oracle exadata And Oracle exadata architecture
14. Oracle Relink
15. Materialized view in Oracle
16. DBA_JOBS facts
17. Oracle Partitioned table
18. Oracle Partition Index
19. REGEXP string Manipulation
20. Oracle row migration and row chaining
21. Edition-Based Redefinition in Oracle
22. ISM and DISM usage is Oracle
23. Oracle virtual Private database(VPD)

Section 13:ORA errors

1. ORA-06512
2. ORA-00911
3. ORA-03113
4. ORA-29913
5. ORA-00257
6. ORA-00054
7. ORA-27154
8. ORA-01111
9. ora-20001
10. ORA-29285
11. ORA-29280
12. ORA-29283
13. ORA-01017
14. ORA-00900
15. ORA-00001
16. Snapshot controlfile feature with RMAN and ORA-00245
17. ORA-00936
18. ORA-28000
19. ORA-00257

Section 14: Oracle Virtual Box

1. Step by Step instructions for Oracle Virtual Box Installation
2. Enabling Virtualization in BIOS in Laptop or Desktop for Virtualbox VM
3. How to delete Virtual Machine from VirtualBox
4. Pre-Built Oracle database for learning and testing using Oracle Developer VM

This Oracle DBA tutorial article serves as a comprehensive resource for anyone aiming to excel in Oracle database administration. Whether you’re just starting your journey or are an experienced DBA looking to deepen your expertise, these tutorials provide the foundational knowledge and advanced techniques needed to manage and optimize Oracle databases effectively. By following these tutorials, you’ll be well-equipped to handle the challenges of database administration, ensuring the reliability, performance, and security of your organization’s data infrastructure.

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