1. Database Reference
  2. Dynamic Performance Views
  3. Dynamic Performance (V$) Views: V$IM_COLUMN_LEVEL to V$RULE_SET_AGGREGATE_STATS
  4. V$INSTANCE

8.8 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)

CON_ID

NUMBER

The ID of the container to which the data pertains. Possible values include:

  • 0: This value is used for rows containing data that pertain to the entire CDB. This value is also used for rows in non-CDBs.

  • 1: This value is used for rows containing data that pertain to only the root

  • n: Where n is the applicable container ID for the rows containing data

INSTANCE_MODE

VARCHAR2(11)

Shows the instance mode of the current instance.

Possible values:

  • REGULAR: A regular Oracle RAC instance. This value is also always used for any non-Oracle RAC instance.

  • READ MOSTLY: An Oracle RAC instance that performs very few database writes

  • READ ONLY: A read-only Oracle RAC instance

EDITION

VARCHAR2(7)

The edition of the database.

Possible values include:

  • CORE EE: CORE Enterprise Edition

  • EE: Enterprise Edition

  • PO: Personal Edition

  • XE: Express Edition

FAMILY

VARCHAR2(80)

For internal use only.

DATABASE_TYPE

VARCHAR2(15)

Database type:

  • RAC: If the database is a regular Oracle RAC database which may have multiple instances.

  • RACONENODE: If the database is Oracle RAC, but allows only one instance to run at any time - the RAC One Node mode.

  • SINGLE: If the database is running as a single instance.

  • UNKNOWN: If the database's type can't be determined. This might happen when the database is registered as a DB resource with CRS but the CRS service has failed to return valid database type information. Typically, this indicates that either the CRS service is down or it is in a faulty state.