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Editorial Team
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Asked: 2026-05-25T16:05:32+00:00

According to The Oracle FAQ , you can query the SYS.V_$ACTIVE_INSTANCES and/or SYS.V_$THREAD views

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According to The Oracle FAQ, you can query the SYS.V_$ACTIVE_INSTANCES and/or SYS.V_$THREAD views to find the number of active RAC instances. I remember reading somewhere that the V_$ views are internal to Oracle and subject to change without notification. Is this true? Is there an “official” way to find the number of running instances in a RAC database in a stored procedure? Is there a way to find out the total number of RAC instances for a database, running or not?

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1 Answer

  1. Editorial Team

    From the same oracle FAQ,

    To list the active instances from PL/SQL, use
    DBMS_UTILITY.ACTIVE_INSTANCES().

    and yes are “subject to change without notification”: someone can draw out the power cable of one machine “without notification”

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