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Oracle 视图 DBA_PDBS 官方解释，作用，如何使用详细说明

本站中文解释

Oracle视图DBA_PDBS 是表示当前实例中的所有可用的 Pluggable Databases (PDBs)的一个视图。它的的内容包括PDB的GUID, 名称,容器数据库,状态，是否可用等。

使用DBA_PDBS视图，可以查询存在与数据库实例中的PBD的基本信息， 如PDB的GUID，名称，容器数据库，是否可用等。

使用方法：

1. 查询特定容器中的PDB：

SELECT * FROM DBA_PDBS WHERE CON_ID=&CON_ID

2. 查询所有可用PDB：

SELECT * FROM DBA_PDBS WHERE OPEN_MODE=’READ WRITE’

官方英文解释

DBA_PDBS describes PDBs belonging to a given CDB.

When queried from a CDB root, this view describes all PDBs that belong to the CDB. When queried from an application root, it describes all PDBs that belong to the application container. When queried from a regular PDB or from an application PDB, it describes the regular PDB or the application PDB.

Column Datatype NULL Description

PDB_ID

NUMBER

NOT NULL

Container ID of the PDB

PDB_NAME

VARCHAR2(128)

NOT NULL

Name of the PDB

DBID

NUMBER

NOT NULL

PDB identifier calculated when the PDB is created and stored in all file headers associated with the PDB

CON_UID

NUMBER

NOT NULL

Unique identifier associated with the container

GUID

RAW(16)

Globally unique immutable ID assigned to the PDB at creation time

STATUS

VARCHAR2(10)

State of the PDB. Possible values:

  • NEW – The PDB has never been opened since it was created. It must be opened in READ WRITE mode for Oracle to perform processing needed to complete the integration of the PDB into the CDB and mark it NORMAL. An error will be thrown if an attempt is made to open the PDB read only.

  • NORMAL – The PDB is ready to be used.

  • UNPLUGGED – The PDB has been unplugged. The only operation that can be performed on it is DROP PLUGGABLE DATABASE.

  • RELOCATING: The PDB is in the process of being relocated to a different CDB.

  • RELOCATED: The PDB has been relocated to a different CDB.

  • REFRESHING: The PDB is a refresh PDB.

  • UNDEFINED: The PDB is in an undefined state.

  • UNUSABLE – The PDB is being created or an unrecoverable error was encountered during its creation. The PDB cannot be opened while its state is set to UNUSABLE. If the PDB remains in this state because of an error encountered during its creation, it can only be dropped. The alert log can be checked to determine if there was an error during PDB creation.

CREATION_SCN

NUMBER

Creation SCN

VSN

NUMBER

The version number of the PDB

LOGGING

VARCHAR2(9)

Shows the current logging mode for the PDB. Possible values:

  • LOGGING

  • NOLOGGING

FORCE_LOGGING

VARCHAR2(3)

Specifies whether force logging is turned on for the PDB. Possible values:

  • NO

  • YES

FORCE_NOLOGGING

VARCHAR2(3)

Specifies whether force nologging is turned on for the PDB. Possible values:

  • NO

  • YES

APPLICATION_ROOT

VARCHAR2(3)

Indicates whether the PDB is an application root.

APPLICATION_PDB

VARCHAR2(3)

Indicates whether a PDB is an application PDB

APPLICATION_SEED

VARCHAR2(3)

Indicates whether a PDB is an application seed (an application seed is also an application PDB)

APPLICATION_ROOT_CON_ID

NUMBER

If this PDB is an application PDB, the container ID of an application root to which this application PDB belongs.

If this PDB is an application root clone, the container ID of an application root to which this application root clone belongs.

Otherwise, NULL.

IS_PROXY_PDB

VARCHAR2(3)

Indicates whether this PDB is a proxy PDB

CON_ID

NUMBER

NOT NULL

The ID of the container that CON_DBID identifies. Possible values include:

  • 0: This value is used for rows containing data that pertain to the entire multitenant container database (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

UPGRADE_PRIORITY

NUMBER

The upgrade priority of the PDB.

APPLICATION_CLONE

VARCHAR2(3)

Indicates whether this PDB is an application root clone (YES) or not (NO)

FOREIGN_CDB_DBID

NUMBER

The foreign CDB’s DBID

UNPLUG_SCN

NUMBER

SCN at which the PDB was unplugged

FOREIGN_PDB_ID

NUMBER

The foreign PDB ID

CREATION_TIME

DATE

NOT NULL

PDB creation timestamp

REFRESH_MODE

VARCHAR2(6)

PDB refresh mode. Possible values:

  • MANUAL

  • AUTO

REFRESH_INTERVAL

NUMBER

PDB refresh interval. This is applicable only when REFRESH_MODE is AUTO.

TEMPLATE

VARCHAR2(3)

For internal use only

LAST_REFRESH_SCN

NUMBER

System change number (SCN) of the last refresh operation

TENANT_ID

VARCHAR2(255)

Pluggable database tenant key

SNAPSHOT_MODE

VARCHAR2(6)

Pluggable database snapshot mode

SNAPSHOT_INTERVAL

NUMBER

Pluggable database snapshot interval, in minutes

CREDENTIAL_NAME

VARCHAR2(262)

Credential object name associated with the PDB

LAST_REFRESH_TIMEFoot 1

DATE

  

Time of the last refresh operation

CLOUD_IDENTITYFoot 1

VARCHAR2(4000)

  

Cloud identifier for the PDB

SOURCE_PDB_NAMEFoot 1

VARCHAR2(128)

  

Name of the source PDB

SOURCE_DB_LINKFoot 1

VARCHAR2(128)

  

Name of the source database link

Footnote 1 This column is available starting with Oracle Database 21c.


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