Oracle教程 2023-02-24

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

本站中文解释

Oracle视图V$LOGSTDBY_TRANSACTION是数据库实例中流复制会话使用的一个动态性系统视图。它包括实例上活动注册的会话及实时复制/恢复操作执行的详细信息。此视图可显示复制会话中当前处理的操作步骤，以及步骤被处理之前的信息。

使用V$LOGSTDBY_TRANSACTION视图可以:
1、查看当前正在实时复制/恢复的操作的基本信息，包括操作的状态、用户名及操作的类型;
2、查看当前正在处理的事务及复制它的投影状态;
3、确定当前会话来着于何处，以及当前会话的连接模式;
4、使用该视图的START_SCN、STOP_SCN和SCN_RANGE来检查特定数据库版本下对应的事务范围，即需要从哪里开始，结束和它们之间的事务;
5、查看当前系统中复制会话，即用于传递改变将被应用到另一台数据库实例中的连接会话。

官方英文解释

V$LOGSTDBY_TRANSACTION displays all transactions that are actively being processed by SQL Apply.

The transaction identifiers shown in this view are those mined from the redo stream and correspond to transaction identifiers assigned at the primary database, and do not correspond to the transactions that are active at the logical standby database. For information regarding transactions active in the logical standby database, including those created as part of SQL Apply, query the V$TRANSACTION view at the logical standby database.

Column	Datatype	Description
`PRIMARY_XIDUSN`	`NUMBER`	Undo segment number of the transaction
`PRIMARY_XIDSLT`	`NUMBER`	Slot number of the transaction
`PRIMARY_XIDSQN`	`NUMBER`	Sequence number of the transaction
`PRIMARY_XID`	`RAW(8)`	Transaction ID
`PRIMARY_START_SCN`	`NUMBER`	Start system change number (SCN) base
`PRIMARY_START_TIME`	`DATE`	Start time
`PRIMARY_PARENT_XIDUSN`	`NUMBER`	Undo segment number of the parent transaction
`PRIMARY_PARENT_XIDSLT`	`NUMBER`	Slot number of the parent transaction
`PRIMARY_PARENT_XIDSQN`	`NUMBER`	Sequence number of the parent transaction
`PRIMARY_PARENT_XID`	`RAW(8)`	Transaction ID of the parent transaction (PDML)
`TYPE`	`VARCHAR2(32)`	Type: `PL/SQL` – Transaction was done as part of a supported PL/SQL procedure `Direct Path Load` – Transaction is a direct path load `CTAS` – Transaction contains at least one `CREATE TABLE ... AS SELECT` operation `DDL` – Transaction contains one or more DDL operations `PDML Child` – Transaction is a child transaction `DML` – Transaction contains only DML operations
`MINING_STATUS`	`VARCHAR2(32)`	Mining status: `ACTIVE` – Transaction is still being mined by LogMiner. At least part of this transaction is ready to be applied or has already been applied. `COMPLETE` – Transaction is complete and ready to be applied. LogMiner has finished mining.
`SRC_CON_ID`	`NUMBER`	Contains the PDB ID (the `PDB_ID` column from the `DBA_PDBS` view) of the source database that generated the change for this transaction.
`APPLY_STATUS`	`VARCHAR2(6)`	`ACTIVE` – Transaction has been assigned to an apply server. It is in one of the following states: – The transaction is being actively applied – The transaction is being held by an apply server waiting for certain events to occur – The transaction is being held by an apply server waiting for subsequent parts of this transaction `NONE` – Transaction has not yet been assigned to an apply server
`SID`	`NUMBER`	Session ID of the apply server’s session; Null if `APPLY_STATUS` is `NONE`
`SERIAL#`	`NUMBER`	Serial number of the apply server’s session; Null if `APPLY_STATUS` is `NONE`
`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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