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V$INSTANCE

V$INSTANCE 展示当前实力的状态。

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)`	Mode of the Oracle Real Application Clusters (Oracle RAC) instance. Possible values: `REGULAR`: A regular Oracle RAC instance `READ MOSTLY`: An Oracle RAC instance which has very few database writes
`EDITION`	`VARCHAR2(7)`	The edition of the database. Possible values include: `CORE EE`: CORE Enterprise Edition `CORE SE`: CORE Standard Edition `EE`: Enterprise Edition `PO`: Personal Edition `SE`: Standard Edition `XE`: Express Edition
`FAMILY`	`VARCHAR2(80)`	For internal use only.

V$INSTANCE视图

V$INSTANCE

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