V$STREAMS_APPLY_SERVER

V$STREAMS_APPLY_SERVER displays information about each apply server and its activities. An apply server receives events from the apply coordinator for an apply process. For each event received, an apply server either applies the event or sends the event to the appropriate apply handler.

Column	Datatype	Description
`SID`	`NUMBER`	Session ID of the apply server's session
`SERIAL#`	`NUMBER`	Serial number of the apply server's session
`APPLY#`	`NUMBER`	Apply process number. An apply process is an Oracle background process, prefixed by `ap`.
`APPLY_NAME`	`VARCHAR2(30)`	Name of the apply process
`SERVER_ID`	`NUMBER`	Parallel execution server number of the apply server
`STATE`	`VARCHAR2(20)`	State of the apply server: `IDLE` - Performing no work `RECORD LOW-WATERMARK` - Performing an administrative job that maintains information about the apply progress, which is used in the `ALL_APPLY_PROGRESS` and `DBA_APPLY_PROGRESS` data dictionary views `ADD PARTITION` - Performing an administrative job that adds a partition that is used for recording information about in-progress transactions `DROP PARTITION` - Performing an administrative job that purges rows that were used to record information about in-progress transactions `EXECUTE TRANSACTION` - Applying a transaction `WAIT COMMIT` - Waiting to commit a transaction until all other transactions with a lower commit SCN are applied. This state is possible only if the `COMMIT_SERIALIZATION` apply process parameter is set to a value other than `DEPENDENT_TRANSACTIONS` and the `PARALLELISM` apply process parameter is set to a value greater than `1`. `WAIT DEPENDENCY` - Waiting to apply a logical change record (LCR) in a transaction until another transaction, on which it has a dependency, is applied. This state is possible only if the `PARALLELISM` apply process parameter is set to a value greater than `1`. `ROLLBACK TRANSACTION` - Rolling back a transaction `TRANSACTION CLEANUP` - Cleaning up an applied transaction, which includes removing LCRs from the apply process's queue `INITIALIZING` - Starting up
`XIDUSN`	`NUMBER`	Transaction ID undo segment number of the transaction currently being applied
`XIDSLT`	`NUMBER`	Transaction ID slot number of the transaction currently being applied
`XIDSQN`	`NUMBER`	Transaction ID sequence number of the transaction currently being applied
`COMMITSCN`	`NUMBER`	Commit system change number (SCN) of the transaction currently being applied
`DEP_XIDUSN`	`NUMBER`	Transaction ID undo segment number of a transaction on which the transaction being applied by this apply server depends
`DEP_XIDSLT`	`NUMBER`	Transaction ID slot number of a transaction on which the transaction being applied by this apply server depends
`DEP_XIDSQN`	`NUMBER`	Transaction ID sequence number of a transaction on which the transaction being applied by this apply server depends
`DEP_COMMITSCN`	`NUMBER`	Commit system change number (SCN) of the transaction on which this apply server depends
`MESSAGE_SEQUENCE`	`NUMBER`	Number of the current message being applied by the apply server. This value is reset to `1` at the beginning of each transaction.
`TOTAL_ASSIGNED`	`NUMBER`	Total number of transactions assigned to the apply server since the apply process was last started
`TOTAL_ADMIN`	`NUMBER`	Total number of administrative jobs done by the apply server since the apply process was last started. See the `STATE` information in this view for the types of administrative jobs.
`TOTAL_ROLLBACKS`	`NUMBER`	Number of transactions assigned to this server which were rolled back
`TOTAL_MESSAGES_APPLIED`	`NUMBER`	Total number of messages applied by this apply server since the apply process was last started
`APPLY_TIME`	`DATE`	Time the last message was applied
`APPLIED_MESSAGE_NUMBER`	`NUMBER`	Number of the last message applied
`APPLIED_MESSAGE_CREATE_TIME`	`DATE`	Creation time at the source database of the last captured message applied. No information about user-enqueued messages is recorded in this column.
`ELAPSED_DEQUEUE_TIME`	`NUMBER`	Time elapsed (in hundredths of a second) dequeuing messages since the apply process was last started
`ELAPSED_APPLY_TIME`	`NUMBER`	Time elapsed (in hundredths of a second) applying messages since the apply process was last started
`COMMIT_POSITION`	`RAW(64)`	Reserved for internal use
`DEP_COMMIT_POSITION`	`RAW(64)`	Reserved for internal use
`LAST_APPLY_POSITION`	`RAW(64)`	Reserved for internal use
`TRANSACTION_ID`	`VARCHAR2(128)`	Transaction ID that the slave is applying
`DEP_TRANSACTION_ID`	`VARCHAR2(128)`	Transaction ID of the transaction the slave depends on

Note:

The ELAPSED_DEQUEUE_TIME and ELAPSED_APPLY_TIME columns are only populated if the TIMED_STATISTICS initialization parameter is set to true, or if the STATISTICS_LEVEL initialization parameter is set to TYPICAL or ALL.