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Oracle® Database Reference
11g Release 1 (11.1)

Part Number B28320-01
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V$UNDOSTAT displays a histogram of statistical data to show how well the system is working. The available statistics include undo space consumption, transaction concurrency, and length of queries executed in the instance. You can use this view to estimate the amount of undo space required for the current workload. Oracle uses this view to tune undo usage in the system. The view returns NULL values if the system is in manual undo management mode.

Each row in the view keeps statistics collected in the instance for a 10-minute interval. The rows are in descending order by the BEGIN_TIME column value. Each row belongs to the time interval marked by (BEGIN_TIME, END_TIME). Each column represents the data collected for the particular statistic in that time interval. The first row of the view contains statistics for the (partial) current time period. The view contains a total of 576 rows, spanning a 4 day cycle.

Column Datatype Description
BEGIN_TIME DATE Identifies the beginning of the time interval
END_TIME DATE Identifies the end of the time interval
UNDOTSN NUMBER Represents the last active undo tablespace in the duration of time. The tablespace ID of the active undo tablespace is returned in this column. If more than one undo tablespace was active in that period, the active undo tablespace that was active at the end of the period is reported.
UNDOBLKS NUMBER Represents the total number of undo blocks consumed. You can use this column to obtain the consumption rate of undo blocks, and thereby estimate the size of the undo tablespace needed to handle the workload on your system.
TXNCOUNT NUMBER Identifies the total number of transactions executed within the period
MAXQUERYLEN NUMBER Identifies the length of the longest query (in seconds) executed in the instance during the period. You can use this statistic to estimate the proper setting of the UNDO_RETENTION initialization parameter. The length of a query is measured from the cursor open time to the last fetch/execute time of the cursor. Only the length of those cursors that have been fetched/executed during the period are reflected in the view.
MAXQUERYID VARCHAR2(13) SQL identifier of the longest running SQL statement in the period
MAXCONCURRENCY NUMBER Identifies the highest number of transactions executed concurrently within the period
UNXPSTEALCNT NUMBER Number of attempts to obtain undo space by stealing unexpired extents from other transactions
UNXPBLKRELCNT NUMBER Number of unexpired blocks removed from certain undo segments so they can be used by other transactions
UNXPBLKREUCNT NUMBER Number of unexpired undo blocks reused by transactions
EXPSTEALCNT NUMBER Number of attempts to steal expired undo blocks from other undo segments
EXPBLKRELCNT NUMBER Number of expired undo blocks stolen from other undo segments
EXPBLKREUCNT NUMBER Number of expired undo blocks reused within the same undo segments
SSOLDERRCNT NUMBER Identifies the number of times the error ORA-01555 occurred. You can use this statistic to decide whether or not the UNDO_RETENTION initialization parameter is set properly given the size of the undo tablespace. Increasing the value of UNDO_RETENTION can reduce the occurrence of this error.
NOSPACEERRCNT NUMBER Identifies the number of times space was requested in the undo tablespace and there was no free space available. That is, all of the space in the undo tablespace was in use by active transactions. The corrective action is to add more space to the undo tablespace.
ACTIVEBLKS NUMBER Total number of blocks in the active extents of the undo tablespace for the instance at the sampled time in the period
UNEXPIREDBLKS NUMBER Total number of blocks in the unexpired extents of the undo tablespace for the instance at the sampled time in the period
EXPIREDBLKS NUMBER Total number of blocks in the expired extents of the undo tablespace for the instance at the sampled time in the period
TUNED_UNDORETENTION NUMBER Amount of time (in seconds) for which undo will not be recycled from the time it was committed. At any point in time, the latest value of TUNED_UNDORETENTION is used to determine whether data committed at a particular time in the past can be recycled.