7.156 V$DATABASE

V$DATABASE displays information about the database from the control file.

Column Datatype Description

DBID

NUMBER

Database identifier calculated when the database is created and stored in all file headers

NAME

VARCHAR2(9)

Name of the database

CREATED

DATE

Creation date of the database. If the control file was re-created using the CREATE CONTROLFILE statement, then this column displays the date that the control file was re-created.

RESETLOGS_CHANGE#

NUMBER

System change number (SCN) at open resetlogs

RESETLOGS_TIME

DATE

Timestamp of open resetlogs

PRIOR_RESETLOGS_CHANGE#

NUMBER

SCN at prior resetlogs

PRIOR_RESETLOGS_TIME

DATE

Timestamp of prior resetlogs

LOG_MODE

VARCHAR2(12)

Archive log mode:

  • NOARCHIVELOG

  • ARCHIVELOG

  • MANUAL

CHECKPOINT_CHANGE#

NUMBER

Last SCN checkpointed

ARCHIVE_CHANGE#

NUMBER

Database force archiving SCN. Any redo log with a start SCN below this will be forced to archive out.

CONTROLFILE_TYPE

VARCHAR2(7)

Type of control file:

  • STANDBY - Indicates that the database is in standby mode

  • CLONE - Indicates a clone database

  • BACKUP | CREATED - Indicates the database is being recovered using a backup or created control file

  • CURRENT - database is available for general use

CONTROLFILE_CREATED

DATE

Creation date of the control file

CONTROLFILE_SEQUENCE#

NUMBER

Control file sequence number incremented by control file transactions

CONTROLFILE_CHANGE#

NUMBER

Last SCN in backup control file; null if the control file is not a backup

CONTROLFILE_TIME

DATE

Last timestamp in backup control file; null if the control file is not a backup

OPEN_RESETLOGS

VARCHAR2(11)

(NOT ALLOWED | ALLOWED | REQUIRED) Indicates whether the next database open allows or requires the resetlogs option

VERSION_TIME

DATE

Version time

OPEN_MODE

VARCHAR2(20)

Open mode information:

  • MOUNTED

  • READ WRITE

  • READ ONLY

  • READ ONLY WITH APPLY - A physical standby database is open in real-time query mode

PROTECTION_MODE

VARCHAR2(20)

Protection mode currently in effect for the database:

  • MAXIMUM PROTECTION - Database is running in maximized protection mode

  • MAXIMUM AVAILABILITY - Database is running in maximized availability mode

  • RESYNCHRONIZATION - Database is running in resynchronization mode

  • MAXIMUM PERFORMANCE - Database is running in maximized performance mode

  • UNPROTECTED - Database is unprotected (this normally occurs when the primary database is mounted and not open)

PROTECTION_LEVEL

VARCHAR2(20)

Aggregated protection mode currently in effect for the database:

  • MAXIMUM PROTECTION - Database is running in maximized protection mode

  • MAXIMUM AVAILABILITY - Database is running in maximized availability mode

  • RESYNCHRONIZATION - Database is running in resynchronization mode

  • MAXIMUM PERFORMANCE - Database is running in maximized performance mode

  • UNPROTECTED - Database is unprotected (this normally occurs when the primary database is mounted and not open)

Note: This column is an aggregation of the PROTECTION_MODE of all standby archive log destinations.

REMOTE_ARCHIVE

VARCHAR2(8)

Value of the REMOTE_ARCHIVE_ENABLE initialization parameter

ACTIVATION#

NUMBER

Number assigned to the database instantiation

SWITCHOVER#

NUMBER

Number assigned to the database switchover

DATABASE_ROLE

VARCHAR2(16)

Current role of the database:

  • SNAPSHOT STANDBY

  • LOGICAL STANDBY

  • PHYSICAL STANDBY

  • PRIMARY

  • FAR SYNC

ARCHIVELOG_CHANGE#

NUMBER

Highest NEXT_CHANGE# (from the V$ARCHIVED_LOG view) for an archive log

ARCHIVELOG_COMPRESSION

VARCHAR2(8)

Status of the archive log compression (ENABLED) or (DISABLED)

SWITCHOVER_STATUS

VARCHAR2(20)

Indicates whether switchover is allowed:

  • NOT ALLOWED - On a primary database, this status indicates that there are no valid and enabled standby databases. On a standby database, this status indicates that a switchover request has not been received from the primary database.

  • SESSIONS ACTIVE - The database has active sessions. On a physical standby database, the WITH SESSION SHUTDOWN SQL clause must be specified to perform a role transition while in this state. On a logical standby database, a role transition can be performed while in this state, but the role transition will not complete until all current transactions have committed.

  • SWITCHOVER PENDING - On a physical standby database, this status indicates that a switchover request has been received from the primary database and is being processed. A physical standby database cannot switch to the primary role while in this transient state.

  • SWITCHOVER LATENT - On a physical standby database, this status indicates that a switchover request was pending, but the original primary database has been switched back to the primary role.

  • TO PRIMARY - The database is ready to switch to the primary role.

  • TO STANDBY - The database is ready to switch to either the physical or logical standby role.

  • TO LOGICAL STANDBY - The database has received a data dictionary from a logical standby database and is ready to switch to the logical standby role.

  • RECOVERY NEEDED - On a physical standby database, this status indicates that additional redo must be applied before the database can switch to the primary role.

  • PREPARING SWITCHOVER - On a primary database, this status indicates that a data dictionary is being received from a logical standby database in preparation for switching to the logical standby role. On a logical standby database, this status indicates that the data dictionary has been sent to the primary database and other standby databases.

  • PREPARING DICTIONARY - On a logical standby database, this status indicates that the data dictionary is being sent to the primary database and other standby databases in preparation for switching to the primary role.

  • FAILED DESTINATION - On a primary database, this status indicates that one or more standby destinations are in an error state.

  • RESOLVABLE GAP - On a primary database, this status indicates that one or more standby databases have a redo gap that can be automatically resolved by fetching the missing redo from the primary database or from another standby database.

  • UNRESOLVABLE GAP - On a primary database, this status indicates that one or more standby databases have a redo gap that cannot be automatically resolved by fetching the missing redo from the primary database or from another standby database.

  • LOG SWITCH GAP - On a primary database, this status indicates that one or more standby databases are missing redo due to a recent log switch.

DATAGUARD_BROKER

VARCHAR2(8)

Data Guard broker information:

  • ENABLED - Database is part of a broker configuration and broker management of the database is enabled

  • DISABLED - Database is part of a broker configuration and broker management of the database is disabled. This value is displayed if the user disabled broker management of the database or configuration, or if broker management was disabled due to a role change (for example, the old primary was disabled after a failover operation).

GUARD_STATUS

VARCHAR2(7)

Protects data from being changed:

  • ALL - Indicates all users other than SYS are prevented from making changes to any data in the database.

  • STANDBY - Indicates all users other than SYS are prevented from making changes to any database object being maintained by logical standby.

  • NONE - Indicates normal security for all data in the database.

SUPPLEMENTAL_LOG_DATA_MIN

VARCHAR2(8)

Ensures that LogMiner (and any products building on LogMiner technology) will have sufficient information to support chained rows and various storage arrangements such as cluster tables:

  • NO - None of the database-wide supplemental logging directives are enabled.

    In a CDB, a value of NO means that minimal supplemental logging is not enabled in all of the PDBs in the CDB.

  • IMPLICIT - Minimal supplemental logging is enabled because all or a combination of primary key, unique key, and foreign key supplemental logging is enabled

  • YES - Minimal supplemental logging is enabled through an ALTER DATABASE ADD SUPPLEMENTAL LOG DATA statement.

    In a CDB, a value of YES means that minimal supplemental logging is enabled in all of the PDBs in the CDB.

See Also: Oracle Database SQL Language Reference for additional information about the ALTER DATABASE ADD SUPPLEMENTAL LOG DATA statement

SUPPLEMENTAL_LOG_DATA_PK

VARCHAR2(3)

For all tables with a primary key, indicates whether all columns of the primary key are placed into the redo log whenever an update is performed (YES) or not (NO).

When a value of YES appears in a CDB, it means that primary key supplemental logging is enabled in all of the PDBs in the CDB.

When a value of NO appears in a CDB, query the PRIMARY_KEY column in the DBA_SUPPLEMENTAL_LOGGING view for each PDB in the CDB to see whether primary key supplemental logging is enabled in the PDB.

See Also: Oracle Database SQL Language Reference for more information about the ALTER DATABASE ADD SUPPLEMENTAL LOG supplemental_id_key_clause statement

SUPPLEMENTAL_LOG_DATA_UI

VARCHAR2(3)

For all tables with a unique key, indicates whether all other columns belonging to the unique key are placed into the redo log if any of the unique key columns are modified (YES) or not (NO).

When a value of YES appears in a CDB, it means that this value is enabled in all of the PDBs in the CDB.

When a value of NO appears in a CDB, query the UNIQUE_INDEX column in the DBA_SUPPLEMENTAL_LOGGING view for each PDB in the CDB to see whether unique column supplemental logging is enabled in the PDB.

See Also: Oracle Database SQL Language Reference for more information about the ALTER DATABASE ADD SUPPLEMENTAL LOG supplemental_id_key_clause statement

FORCE_LOGGING

VARCHAR2(39)

Indicates the type of logging mode that is currently in force. The valid values and their meanings are:

  • NO - This value means that no logging mode has been enabled for the database

  • YES - This value means that FORCE LOGGING mode has been enabled for the database

  • STANDBY NOLOGGING FOR LOAD PERFORMANCE - This value is used when this is the current mode for the database

  • STANDBY NOLOGGING FOR DATA AVAILABILITY - This value is used when this is the current mode for the database

PLATFORM_ID

NUMBER

Platform identification number of the database

PLATFORM_NAME

VARCHAR2(101)

Platform name of the database

RECOVERY_TARGET_INCARNATION#

NUMBER

Incarnation number where all data files are recovered by the RECOVER DATABASE command

LAST_OPEN_INCARNATION#

NUMBER

Record number of the incarnation in V$DATABASE_INCARNATION that was last opened successfully

CURRENT_SCN

NUMBER

Current SCN; null if the database is not currently open. For a standby database, it is the checkpoint SCN of the mounted physical standby database during media recovery and is always less than the last applied SCN tracked in V$RECOVERY_PROGRESS.

FLASHBACK_ON

VARCHAR2(18)

Possible values are as follows:

  • YES - Flashback is on

  • NO - Flashback is off

  • RESTORE POINT ONLY - Flashback is on but one can only flashback to guaranteed restore points

SUPPLEMENTAL_LOG_DATA_FK

VARCHAR2(3)

For all tables with a foreign key, indicates whether all other columns belonging to the foreign key are placed into the redo log if any foreign key columns are modified (YES) or not (NO).

When a value of YES appears in a CDB, it means that foreign key supplemental logging is enabled in all of the PDBs in the CDB.

When a value of NO appears in a CDB, query the FOREIGN_KEY column in the DBA_SUPPLEMENTAL_LOGGING view for each PDB in the CDB to see whether foreign key supplemental logging is enabled in the PDB.

See Also: Oracle Database SQL Language Reference for more information about the ALTER DATABASE ADD SUPPLEMENTAL LOG supplemental_id_key_clause statement

SUPPLEMENTAL_LOG_DATA_ALL

VARCHAR2(3)

For all columns, indicates whether all the fixed-length maximum size columns of that row are placed into the redo log (YES) or not (NO).

When a value of YES appears in a CDB, it means that all column supplemental logging is enabled in all of the PDBs in the CDB.

When a value of NO appears in a CDB, query the ALL_COLUMN column in the DBA_SUPPLEMENTAL_LOGGING view for each PDB in the CDB to see whether all column supplemental logging is enabled in the PDB.

See Also: Oracle Database SQL Language Reference for more information about the ALTER DATABASE ADD SUPPLEMENTAL LOG supplemental_id_key_clause statement

DB_UNIQUE_NAME

VARCHAR2(30)

Unique database name

STANDBY_BECAME_PRIMARY_SCN

NUMBER

SCN at which a physical standby database became a primary database. This SCN is useful for converting a failed primary database into a physical standby database after a forced failover.

See Also: Oracle Data Guard Concepts and Administration for more information about Oracle Data Guard.

FS_FAILOVER_MODEFoot 1

VARCHAR2(19)

Displays the current fast-start failover mode. Possible values are:
  • DISABLED - Fast-start failover is disabled.

  • OBSERVE-ONLY - Fast-start failover is enabled in test drive mode.

  • ZERO DATA LOSS - Fast-start failover is enabled and a fast-start failover cannot incur any data loss.

  • POTENTIAL DATA LOSS - Fast-start failover is enabled and a fast-start failover can incur data loss within FastStartFailoverLagLimit seconds.

    See Also: Oracle Data Guard Broker for more information about the FastStartFailoverLagLimit configuration property

FS_FAILOVER_STATUS

VARCHAR2(22)

Fast-start failover status:

  • DISABLED

  • BYSTANDER

  • SYNCHRONIZED

  • UNSYNCHRONIZED

  • SUSPENDED

  • STALLED

  • LOADING DICTIONARY

  • PRIMARY UNOBSERVED

  • REINSTATE REQUIRED

  • REINSTATE FAILED

  • TARGET OVER LAG LIMIT

  • TARGET UNDER LAG LIMIT

See Also: Oracle Data Guard Broker for detailed descriptions of these values

Note: If the value of this column is DISABLED, then the values for the FS_FAILOVER_CURRENT_TARGET, FS_FAILOVER_THRESHOLD, FS_FAILOVER_OBSERVER_PRESENT, and FS_FAILOVER_OBSERVER_HOST columns in this table are not meaningful.

FS_FAILOVER_CURRENT_TARGET

VARCHAR2(30)

DB_UNIQUE_NAME of the standby that is the current fail-safe failover observer target standby for the Data Guard configuration

FS_FAILOVER_THRESHOLD

NUMBER

Time (in seconds) that the observer will attempt to reconnect with a disconnected primary before attempting fail-safe failover observer with the target standby

FS_FAILOVER_OBSERVER_PRESENT

VARCHAR2(7)

Indicates whether the master observer is currently connected to the local database (YES) or not (NO)

Note: This column is consistent throughout an Oracle RAC environment; that is, if the observer is connected to any instance, then all instances will show a value of YES.

FS_FAILOVER_OBSERVER_HOST

VARCHAR2(512)

Machine name that is currently hosting the master observer process, if fast-start failover is enabled. If fast-start failover is not enabled, this column returns a NULL string.

CONTROLFILE_CONVERTED

VARCHAR2(3)

Indicates whether the control file was implicitly converted from its original type during restore (YES) or not (NO)

This column will be set to YES when RMAN restores a standby control file from a backup of the control file taken at the primary database or restores a backup control file from a backup taken at the physical standby database.

This column will change to NO when the file names are fixed using information in the recovery catalog schema.

PRIMARY_DB_UNIQUE_NAME

VARCHAR2(30)

For any Standby database (Physical, Logical, or Snapshot), this column will contain the DB_UNIQUE_NAME of the Primary database that this Standby last received current redo from.

If this standby has not received any current redo since last being started, then this column will be null.

For a Primary database that had previously been a Standby, this column will contain the DB_UNIQUE_NAME of the last Primary that this database received current redo from while acting as a Standby.

For a Primary database that has never been a Standby, this column will be null.

SUPPLEMENTAL_LOG_DATA_PL

VARCHAR2(3)

Indicates whether additional information is logged in the redo log (YES) or not (NO) during invocation of procedures in Oracle-supplied packages for which procedural replication is supported.

When a value of YES appears in a CDB, it means that supplemental logging for procedural replication is enabled in all of the PDBs in the CDB.

When a value of NO appears in a CDB, query the PROCEDURAL column in the DBA_SUPPLEMENTAL_LOGGING view for each PDB in the CDB to see whether supplemental logging for procedural replication is supported in the PDB.

See Also: Oracle Data Guard Concepts and Administration for a list of Oracle-supplied packages that are procedurally replicated to a logical standby database

MIN_REQUIRED_CAPTURE_CHANGE#

NUMBER

Minimum REQUIRED_CHECKPOINT_SCN for all local capture processes on the database

CDB

VARCHAR2(3)

Possible values are:

  • YES if the database is a CDB

  • NO if the database is not a CDB

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

PENDING_ROLE_CHANGE_TASKS

VARCHAR2(512)

Tasks remaining after an Oracle Data Guard role change. Possible values:

  • NONE: No pending tasks remain

  • NOT APPLICABLE: The database is either standby or is not a DG_CONFIG member

  • BUILD_PENDING: The database was formerly a logical standby and has not yet taken a snapshot of its data dictionary into the redo stream

  • SRL_ARCHIVE_PENDING: The database was formerly a logical standby and the standby redo logs associated with the earlier failover operation have not yet been archived

  • ERROR: The database was formerly a logical standby and the snapshot of the dictionary failed

  • UNKNOWN: The database is not open or the query failed

CON_DBID

NUMBER

The database ID of the PDB

FORCE_FULL_DB_CACHING

VARCHAR2(3)

Indicates the status of the force full database caching feature in the database. Possible values:

  • YES - The database is in force full database caching mode.

  • NO - The database is not in force full database caching mode.

See Also: Oracle Database SQL Language Reference for information about the FORCE FULL DATABASE CACHING clause for the ALTER DATABASE statement

SUPPLEMENTAL_LOG_DATA_SRFoot 1

VARCHAR2(3)

Indicates whether the database is enabled for subset database replication (YES) or not (NO). If the database is enabled for subset database replication, then redo overhead and feature restriction for tables without column data supplemental logging will be reduced.

Footnote 1 This column is available starting with Oracle Database release 19c, version 19.1.

See Also:

"DBA_SUPPLEMENTAL_LOGGING" for more information about supplemental logging in a PDB