V$ROLLSTAT

本文详细介绍了 V$ROLLSTAT 视图中包含的回滚段统计信息,包括回滚段编号、加锁情况、扩展次数等关键指标。

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V$ROLLSTAT

V$ROLLSTAT contains rollback segment statistics.

Column

Datatype

Description

USN

NUMBER

Rollback segment number

LATCH

NUMBER

Latch for the rollback segment

EXTENTS

NUMBER

Number of extents in the rollback segment

RSSIZE

NUMBER

Size (in bytes) of the rollback segment. This value differs by the number of bytes in one database block from the value of theBYTES column of the *_SEGMENTS view.

See Also: Oracle Database Administrator's Guide

WRITES

NUMBER

Number of bytes written to the rollback segment

XACTS

NUMBER

Number of active transactions

GETS

NUMBER

Number of header gets

WAITS

NUMBER

Number of header waits

OPTSIZE

NUMBER

Optimal size of the rollback segment

HWMSIZE

NUMBER

High watermark of the rollback segment size

SHRINKS

NUMBER

Number of times the size of a rollback segment decreases

WRAPS

NUMBER

Number of times rollback segment is wrapped

EXTENDS

NUMBER

Number of times rollback segment size is extended

AVESHRINK

NUMBER

Average shrink size

AVEACTIVE

NUMBER

Current size of active extents, averaged over time.

STATUS

VARCHAR2(15)

Rollback segment status:

·         ONLINE

·         PENDING OFFLINE

·         OFFLINE

·         FULL

CUREXT

NUMBER

Current extent

CURBLK

NUMBER

Current block

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