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HOW TO START A SINGLE INSTANCE OR ALL NODES OF A RAC DATABASE ? DEFINITION: IN RAC (REAL APPLICATION CLUSTERS), INSTEAD OF THE USUAL SETUP WITH ONE INSTANCE AND ONE DATABASE, WE HAVE MULTIPLE INSTANCES CONNECTING TO A SINGLE DATABASE. USAGE: LOAD BALANCING, HIGH AVAILABILITY ASSUMPTION : ASM AND CRS SERVICES ARE ALREADY UP AND RUNNING 1). STARTING ONLY ONE INSTANCE OF A RAC DATABASE SCENARIO :  ASM and CRS SERVICES ARE UP, DATABASE AND INSTANCES ARE DOWN               su - grid (or) su - root               cd $GRID_HOME/bin               ./crsctl check crs                    su - oracle                   srvctl status database -d db_name               srvctl start instance -d db_name -i instance_name     ...