Walt,
The reason for the difference in status is that each view monitors a
different aspect of rbs. v$rollstat is a performance view and would be
constantly updated with such information. dba_rollback_segs is the metadata
view and is fairly static. Imagine the thrashing that would occur if the
performance info was actually kept in the data dictionary. You will also
find similar differences between dba_data_files and v$datafile.
HTH,
Dan Fink
-----Original Message-----
Sent: Monday, July 29, 2002 2:59 PM
To: Multiple recipients of list ORACLE-L
v$rollstat
Okay, so today one of our QA databases suddenly started spewing out ora-1552
errors. Turned out all of the rollback segments had a status of FULL. The
problem was quickly fixed by taking the rollback segments offline, then back
online. The reason why the rollback segments all became FULL is another
story.
Anyway, before the problem was fixed we queried both dba_rollback_segs and
v$rollstat to get the status of the rollback segments. v$rollstat returned
FULL, but dba_rollback_segs returned ONLINE.
I thought this was interesting (I'm easily amused) so I dug up the DDL for
the two views (shown below). The two views appear to get their information
from two different places, and both use DECODEs to make the status
meaningful. But, there's no DECODE value for FULL in dba_rollback_segs. In
fact, the status values for the two can be quite different.
Why are they different? This bothers me. Steve Orr is off fishing today so
he's not here to provide a rational explanation.
Is anyone else bothered by this? Or, should I just laugh it off, pick up the
shattered pieces of my life, and soldier on?
I've also posted this on the appropriate (I think) Metalink forum.
Thanks,
--Walt Weaver
Bozeman, Montana
====================================
create or replace view DBA_ROLLBACK_SEGS
(SEGMENT_NAME, OWNER, TABLESPACE_NAME, SEGMENT_ID, FILE_ID, BLOCK_ID,
INITIAL_EXTENT, NEXT_EXTENT,
MIN_EXTENTS, MAX_EXTENTS, PCT_INCREASE,
STATUS, INSTANCE_NUM, RELATIVE_FNO)
as
select un.name, decode(un.user#,1,'PUBLIC','SYS'),
ts.name, un.us#, f.file#, un.block#,
s.iniexts * ts.blocksize,
decode(bitand(ts.flags, 3), 1, to_number(NULL),
s.extsize * ts.blocksize),
s.minexts, s.maxexts,
decode(bitand(ts.flags, 3), 1, to_number(NULL),
s.extpct),
decode(un.status$, 2, 'OFFLINE', 3, 'ONLINE',
4, 'UNDEFINED', 5, 'NEEDS RECOVERY',
6, 'PARTLY AVAILABLE', 'UNDEFINED'),
decode(un.inst#, 0, NULL, un.inst#), un.file#
from sys.undo$ un, sys.seg$ s, sys.ts$ ts, sys.file$ f
where un.status$ != 1
and un.ts# = s.ts#
and un.file# = s.file#
and un.block# = s.block#
and s.type# = 1
and s.ts# = ts.ts#
and un.ts# = f.ts#
and un.file# = f.relfile#
===================================
GV$ROLLSTAT
select
inst_id,kturdusn,kturdext,kturdsiz,kturdwrt,kturdnax,kturdget,kturdwat, d
ecode(kturdopt, -1,to_number(null), kturdopt),
kturdhwm,kturdnsh,kturdnwp,kturdn
ex, kturdash,kturdaae, decode(kturdflg, 0,'ONLINE', 2,'PENDING OFFLINE',
3,'OFFL
INE', 4, 'FULL', 'UNKNOWN'), kturdcex, kturdcbk from x$kturd where
kturd
siz!=0 and kturdflg != 3
--
Please see the official ORACLE-L FAQ: http://www.orafaq.com
--
Author: Weaver, Walt
INET: [EMAIL PROTECTED]
Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
San Diego, California -- Public Internet access / Mailing Lists
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--
Author: Fink, Dan
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