Skip to main content

Welcome to DBA Master – Database Tips, Tricks, and Tutorials

Welcome to DBA Master ! This blog is dedicated to all things related to database administration , SQL optimization , and performance tuning . Whether you're a beginner or a seasoned DBA, you'll find practical guides, troubleshooting tips, and real-world tutorials to help you work smarter with data. What to Expect: SQL performance tuning tips Indexing strategies Backup and recovery best practices High availability and replication techniques Database creation, configuration, and setup Monitoring queries and scripts for proactive performance management Migration guides across different database platforms Security essentials and best practices Recommended tools for DBAs Real-world error fixes and how to solve them Stay tuned — exciting content is coming soon. Feel free to bookmark and share: www.dbamaster.com ! Thanks for visiting!
Post a Comment

Oracle 19C Database Auto Startup and Auto Shutdown

 step 1: create a file oracle19c.service in /usr/lib/systemd/system

cd /usr/lib/systemd/system

vi oracle19c.service

[Unit]
Description=Oracle Database 19C Service
After=network.target

[Service]
Type=forking
User=oracle
Group=oinstall
Environment="ORACLE_HOME=/u01/app/oracle/product/19.0.0/dbhome_1"
Environment="ORACLE_SID=pearl"
ExecStartPre=/u01/app/oracle/product/19.0.0/dbhome_1/bin/lsnrctl start
ExecStart=/u01/app/oracle/product/19.0.0/dbhome_1/bin/dbstart $ORACLE_HOME >> /var/log/oracle19c.log 2>&1
ExecStop=/u01/app/oracle/product/19.0.0/dbhome_1/bin/dbshut $ORACLE_HOME >> /var/log/oracle19c.log 2>&1
ExecStopPost=/u01/app/oracle/product/19.0.0/dbhome_1/bin/lsnrctl stop
TimeoutSec=120
Restart=always

[Install]
WantedBy=multi-user.target

step 2: Change N to Y in oratab

vi /etc/oratab
pearl:/u01/app/oracle/product/19.0.0/dbhome_1:Y

step 3: enable the oracle service

systemctl daemon-reload        #Reload systemd
systemctl enable oracle19c.service    #Enable the service
systemctl start oracle19c.service    #Start the Oracle 19c service
systemctl status oracle19c.service    #Check the Oracle 19c service status
systemctl stop oracle19c.service    #stop the Oracle 19c service

step 4: Check DB Open or Closed

SELECT status FROM v$instance;        #Database Level

ps -ef|grep pmon        #OS Level

Labels:

Comments

Post a Comment

Popular posts from this blog

Oracle Database 19C Performance Tunning - PART 1

Advantages: 1. Improved Query Performance •    Optimized SQL execution plans lead to faster query response times. •    Reduces unnecessary full table scans and improves indexing strategies. •    Parallel execution tuning speeds up large data processing tasks. 2. Better Resource Utilization •    Efficient use of CPU, memory, disk I/O, and network resources. •    Reduces contention on Redo Logs, Undo Tablespaces, and Buffer Cache. •    Helps in load balancing across multiple instances in RAC (Real Application Clusters). 3. Increased System Scalability •    Ensures that the database can handle a growing number of users and transactions. •    Proper tuning allows scaling without degrading performance. •    Optimized parallel processing ensures better performance on multi-core servers. 4. Lower Infrastructure Costs •    Reduces the need for add...
Post a Comment
Read more

Oracle RMAN Backup And Restore

RMAN: (Oracle 8) RMAN (Recovery Manager) is a utility provided by Oracle Database to perform backup, restore, and recovery operations. It is a command line tool. Features of RMAN in Oracle 19c Comprehensive Backup Capabilities: Full and incremental backups. Block-level backups for efficient data storage. Archived redo log backups. Fast Recovery Area (FRA) integration for centralized backup storage. Efficient Recovery Options: Point-in-time recovery (PITR). Complete and incomplete recovery. Flashback database capabilities for quick undo of changes. Multitenant Database Support: RMAN fully supports container databases (CDBs) and pluggable databases (PDBs). Provides flexibility to back up and recover individual PDBs or entire CDBs. Automatic Space Management: Manages disk space in the FRA. Automatically deletes obsolete backups and archived logs. Data Deduplication and Compression: Backup optimization through block-level deduplication. Built-in compression algorithms to reduce storage req...
Post a Comment
Read more

Oracle 19c Database Software Installation in OEL8

 Pre-requisites for OS level:            Set the static IP Address     Disable the Firewall (systemctl stop firewalld & systemctl disable firewalld)     set SELINUX=permissive on /etc/selinux/config  ##Need to restart the server use init 6 Oracle Installation Pre-requisites Methods     Automatic Setup     Manual Setup      Automatic requisites Setup: (avoid step 1 to step 5): dnf install -y oracle-database-preinstall-19c Install the dependencies: curl -o oracle-database-preinstall-19c-1.0-2.el8.x86_64.rpm https://yum.oracle.com/repo/OracleLinux/OL8/appstream/x86_64/getPackage/oracle-database-preinstall-19c-1.0-2.el8.x86_64.rpm dnf -y localinstall oracle-database-preinstall-19c-1.0-2.el8.x86_64.rpm Manual Setup: step 1: Add the karenl parameters and values vi /etc/sysctl.conf     fs.file-max = 6815744 kernel.sem = 250 32000 100 128 kernel....
Post a Comment
Read more