CRSCTL and SRVCTL Commands Cheat Sheet for Oracle RAC

Introduction:

Managing Oracle RAC environments requires a clear understanding of cluster-related utilities such as CRSCTL and SRVCTL. These tools are essential for controlling cluster resources, monitoring services, and performing routine administrative tasks. This cheat sheet provides commonly used CRSCTL and SRVCTL commands in a simple and practical format, making it easy to use during daily operations.

What Is CRSCTL in Oracle RAC

CRSCTL (Cluster Ready Services Control) is used to manage and monitor Oracle Clusterware components. It helps control cluster resources, check cluster status, and perform node-level operations.

What Is SRVCTL in Oracle RAC

SRVCTL (Server Control Utility) is used to manage Oracle database resources such as databases, instances, listeners, and services in a RAC environment.

CRSCTL Commands (Cluster Management)

Check Cluster Status

crsctl check crs
crsctl check cluster
crsctl check cluster -all

Check Cluster Components

crsctl check cssd
crsctl check crsd
crsctl check evmd
crsctl check has

Check Cluster Resources

crsctl stat res -t
crsctl stat res -t -init

Check Cluster Configuration

crsctl config crs
crsctl get nodename

Check Voting Disk and OCR

crsctl query css votedisk
ocrcheck

Start and Stop CRS Stack

crsctl start crs
crsctl stop crs

CRSCTL Commands for Cluster Start and Stop Operations

Stop Grid Cluster

crsctl stop has
crsctl stop has -n orcl2
crsctl stop cluster -all
crsctl stop cluster -n orcl2

Start Grid Cluster

crsctl start has
crsctl start has -n orcl2
crsctl start cluster -all
crsctl start cluster -n orcl2

Enable or Disable Auto Start

crsctl disable has
crsctl enable has
crsctl disable crs
crsctl enable crs

Version and Cluster Info Commands

crsctl query crs softwareversion
crsctl query crs activeversion

SRVCTL Commands (Database and Resource Management)

Database Management

srvctl start database -d ORCL -o open
srvctl stop database -d ORCL -o immediate
srvctl status database -d ORCL

Instance Management

srvctl start instance -d ORCL -i ORCL1
srvctl stop instance -d ORCL -i ORCL1
srvctl status instance -d ORCL

Service Management

srvctl start service -d ORCL -s SERVICE_NAME
srvctl stop service -d ORCL -s SERVICE_NAME
srvctl status service -d ORCL -s SERVICE_NAME
srvctl relocate service -d ORCL -service SERVICE_NAME -oldinst INST1 -newinst INST2

Add and Remove Database

srvctl add database -d ORCL -o ORACLE_HOME -p SPFILE
srvctl remove database -d ORCL -f -y

Add and Remove Instance

srvctl add instance -d DBNAME -i INST1 -n NODE1
srvctl remove instance -d DBNAME -i INST1

Enable / Disable Database and Instance

srvctl enable database -d ORCL
srvctl disable database -d ORCL
srvctl enable instance -d ORCL -i ORCL1
srvctl disable instance -d ORCL -i ORCL1

Listener Management

srvctl status listener
srvctl start listener
srvctl stop listener

Configuration Commands

srvctl config database -d ORCL
srvctl config service -d ORCL
srvctl config network
srvctl config all

Difference Between CRSCTL and SRVCTL

• CRSCTL manages clusterware components
• SRVCTL manages database and RAC resources
• CRSCTL works at cluster level
• SRVCTL works at database and service level

Best Practices

• Use SRVCTL for database operations instead of manual startup
• Avoid stopping CRS unless required
• Always verify status before and after operations
• Use node-specific commands carefully in multi-node environments

Conclusion: CRSCTL and SRVCTL are essential utilities for managing Oracle RAC environments. Understanding these commands helps control cluster services, manage databases efficiently, and maintain high availability. This cheat sheet serves as a quick reference for commonly used commands, making RAC administration simple and efficient.