V$INSTANCE

V$INSTANCE displays the state of the current instance.

Column Datatype Description
INSTANCE_NUMBER NUMBER Instance number used for instance registration (corresponds to the INSTANCE_NUMBER initialization parameter)

See Also: "INSTANCE_NUMBER"
INSTANCE_NAME VARCHAR2(16) Name of the instance
HOST_NAME VARCHAR2(64) Name of the host machine
VERSION VARCHAR2(17) Database version
STARTUP_TIME DATE Time when the instance was started
STATUS VARCHAR2(12) Status of the instance:

  • STARTED - After STARTUP NOMOUNT

  • MOUNTED - After STARTUP MOUNT or ALTER DATABASE CLOSE

  • OPEN - After STARTUP or ALTER DATABASE OPEN

  • OPEN MIGRATE - After ALTER DATABASE OPEN { UPGRADE | DOWNGRADE }
PARALLEL VARCHAR2(3) Indicates whether the instance is mounted in cluster database mode (YES) or not (NO)
THREAD# NUMBER Redo thread opened by the instance
ARCHIVER VARCHAR2(7) Automatic archiving status:

  • STOPPED

  • STARTED

  • FAILED - Archiver failed to archive a log last time but will try again within 5 minutes
LOG_SWITCH_WAIT VARCHAR2(15) Event that log switching is waiting for:

  • ARCHIVE LOG

  • CLEAR LOG

  • CHECKPOINT

  • NULL - ALTER SYSTEM SWITCH LOGFILE is hung but there is room in the current online redo log
LOGINS VARCHAR2(10) Indicates whether the instance is in unrestricted mode, allowing logins by all users (ALLOWED, or in restricted mode, allowing logins by database administrators only (RESTRICTED)
SHUTDOWN_PENDING VARCHAR2(3) Indicates whether a shutdown is pending (YES) or not (NO)
DATABASE_STATUS VARCHAR2(17) Status of the database:

  • ACTIVE

  • SUSPENDED

  • INSTANCE RECOVERY
INSTANCE_ROLE VARCHAR2(18) Indicates whether the instance is an active instance (PRIMARY_INSTANCE) or an inactive secondary instance (SECONDARY_INSTANCE), or UNKNOWN if the instance has been started but not mounted
ACTIVE_STATE VARCHAR2(9) Quiesce state of the instance:

  • NORMAL - Database is in a normal state.

  • QUIESCING - ALTER SYSTEM QUIESCE RESTRICTED has been issued: no new user transactions, queries, or PL/SQL statements are processed in this instance. User transactions, queries, or PL/SQL statements issued before the ALTER SYSTEM QUIESCE RESTRICTED statement are unaffected. DBA transactions, queries, or PL/SQL statements are also unaffected.

  • QUIESCED - ALTER SYSTEM QUIESCE RESTRICTED has been issued: no user transactions, queries, or PL/SQL statements are processed. DBA transactions, queries, or PL/SQL statements are unaffected. User transactions, queries, or PL/ SQL statements issued after the ALTER SYSTEM QUIESCE RESTRICTED statement are not processed.

A single ALTER SYSTEM QUIESCE RESTRICTED statement quiesces all instances in an Oracle RAC environment. After this statement has been issued, some instances may enter into a quiesced state before other instances; the system is quiesced when all instances enter the quiesced state.
BLOCKED VARCHAR2(3) Indicates whether all services are blocked (YES) or not (NO)