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Oracle® Database Reference
11g Release 2 (11.2)

Part Number E17110-04
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DBA_HIST_MTTR_TARGET_ADVICE

DBA_HIST_MTTR_TARGET_ADVICE displays historical predictions of the number of physical I/O requests for the MTTR corresponding to each row. The data also includes a physical I/O factor, which is the ratio of the number of estimated I/O requests to the number of I/O requests actually performed by the current MTTR setting during the measurement interval. This view contains snapshots of V$MTTR_TARGET_ADVICE.

Column Datatype NULL Description
SNAP_ID NUMBER NOT NULL Unique snapshot ID
DBID NUMBER NOT NULL Database ID for the snapshot
INSTANCE_NUMBER NUMBER NOT NULL Instance number for the snapshot
MTTR_TARGET_FOR_ESTIMATE NUMBER   MTTR setting being simulated (equal to the current MTTR setting if this is the first row of the view)
ADVICE_STATUS VARCHAR2(5)   Current status of MTTR simulation:
  • ON SET

  • READY SET

  • OFF

DIRTY_LIMIT NUMBER   Dirty buffer limit derived from the MTTR being simulated
ESTD_CACHE_WRITES NUMBER   Estimated number of cache physical writes under the MTTR
ESTD_CACHE_WRITE_FACTOR NUMBER   Estimated cache physical write ratio under the MTTR. It is the ratio of the estimated number of cache writes to the number of cache writes under the current MTTR setting.
ESTD_TOTAL_WRITES NUMBER   Estimated total number of physical writes under the MTTR
ESTD_TOTAL_WRITE_FACTOR NUMBER   Estimated total physical write ratio under the MTTR. It is the ratio of the estimated total number of physical writes to the total number of physical writes under the current MTTR setting.
ESTD_TOTAL_IOS NUMBER   Estimated total number of I/O requests under the MTTR
ESTD_TOTAL_IO_FACTOR NUMBER   Estimated total I/O ratio under the MTTR. It is the ratio of the estimated total number of I/O requests to the total number of I/O requests under the current MTTR setting.