Oracle 视图 V$GOLDENGATE_MESSAGE_TRACKING 官方解释，作用，如何使用详细说明

网络编程 Oracle 视图 V$GOLDENGATE_MESSAGE_TRACKING 官方解释，作用，如何使用详细说明 10-15

Oracle视图V$GOLDENGATE_MESSAGE_TRACKING用于跟踪GoldenGate复制时，所处理的消息。这些消息可以是在源数据库中完成的DML操作，也可以是在目标数据库中完成的DML操作。它用于跟踪复制过程中已经完成的操作，以及正等待复制的操作。

OracleV$GOLDENGATE_MESSAGE_TRACKING视图也有助于检查复制是否有效，以及在哪些步骤出现问题。它还能够提供有关正在等待复制的信息，以及在消息复制期间出现的错误的详细信息。

使用V$GOLDENGATE_MESSAGE_TRACKING视图的方法是：

1.查询复制过程中，仍未处理的消息条目：

SELECT *
FROM V$GOLDENGATE_MESSAGE_TRACKING
WHERE STATUS=’PENDING’;

2.查询复制过程中出现错误的消息条目：

SELECT *
FROM V$GOLDENGATE_MESSAGE_TRACKING
WHERE STATUS=’ERROR’;

3.检查消息条目是否已处理：

SELECT *
FROM V$GOLDENGATE_MESSAGE_TRACKING
WHERE STATUS=’COMPLETED’;

4.检查复制消息的详细内容：

SELECT *
FROM V$GOLDENGATE_MESSAGE_TRACKING
WHERE MESSAGE_COLUMN='[MESSAGE_DETAIL]’;

V$GOLDENGATE_MESSAGE_TRACKING displays information about LCRs tracked through the stream that are processed by Oracle GoldenGate components.

You can track an LCR through a stream using one of the following methods:

Set the message_tracking_frequency apply process parameter to 1 or another relatively low value via the Oracle GoldenGate DBOPTIONS INTEGRATEDPARAMS parameter.
Use the DBMS_XSTREAM_ADM.SET_MESSAGE_TRACKING procedure to specify a tracking label that becomes part of each LCR generated by the current session.
When the actions parameter in the DBMS_XSTREAM_ADM.SET_MESSAGE_TRACKING procedure is set to DBMS_XSTREAM_ADM.ACTION_MEMORY, information about the LCRs is tracked in memory, and this view is populated with information about the LCRs. Currently, DBMS_XSTREAM_ADM.ACTION_MEMORY is the only valid setting for the actions parameter in the procedure.

Column	Datatype	Description
`TRACKING_LABEL`	`VARCHAR2(128)`	User-specified tracking label
`TAG`	`RAW(128)`	First 128 bytes of the tag of the LCR
`COMPONENT_NAME`	`VARCHAR2(128)`	Name of the component that processed the LCR
`COMPONENT_TYPE`	`VARCHAR2(128)`	Type of the component that processed the LCR
`ACTION`	`VARCHAR2(50)`	Action performed on the LCR
`ACTION_DETAILS`	`VARCHAR2(312)`	Details of the action
`TIMESTAMP`	`TIMESTAMP(9) WITH TIME ZONE`	Time when the action was performed
`MESSAGE_CREATION_TIME`	`DATE`	Time when the message was created
`MESSAGE_NUMBER`	`NUMBER`	SCN of the message
`TRACKING_ID`	`RAW(16)`	Globally unique OID of the LCR
`SOURCE_DATABASE_NAME`	`VARCHAR2(128)`	Name of the source database
`OBJECT_OWNER`	`VARCHAR2(128)`	Owner of the object
`OBJECT_NAME`	`VARCHAR2(128)`	Name of the object
`XID`	`VARCHAR2(128)`	Transaction ID
`COMMAND_TYPE`	`VARCHAR2(128)`	Command type of the LCR
`MESSAGE_POSITION`	`RAW(64)`	Position of the message
`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

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