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TNS:could not resolve the connect identifier specified
Backtrace message unwound by exceptions
invalid identifier
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internal error
missing expression
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end-of-file on communication channel
TNS:listener unknown in connect descriptor
insufficient privileges
PL/SQL: numeric or value error string
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ORACLE not available
target host or object does not exist
invalid number
unable to allocate string bytes of shared memory
resource busy and acquire with NOWAIT specified
error occurred at recursive SQL level string
ORACLE initialization or shutdown in progress
archiver error. Connect internal only, until freed
snapshot too old
unable to extend temp segment by string in tablespace
Credential retrieval failed
missing or invalid option
invalid username/password; logon denied
unable to create INITIAL extent for segment
out of process memory when trying to allocate string bytes
shared memory realm does not exist
cannot insert NULL
TNS:unable to connect to destination
remote database not found ora-02019
exception encountered: core dump
inconsistent datatypes
no data found
TNS:operation timed out
PL/SQL: could not find program
existing state of packages has been discarded
maximum number of processes exceeded
error signaled in parallel query server
ORACLE instance terminated. Disconnection forced
TNS:packet writer failure
see ORA-12699
missing right parenthesis
name is already used by an existing object
cannot identify/lock data file
invalid file operation
quoted string not properly terminated

Re: ORA-01555: snapshot too old: rollback segment number 24 with name "_SYSSMU24$" too small

Alexander Gorbachev

2006-06-27

Replies:
My respect if you can have terrabyte OLTP system running stable with
auto gather stats job. Quite challenging. :)

If you have bug # - please share.
Stats gathering doesn't do "massive DML". What it does is a lot of
selects and assuming those are long running, one can expect it to fail
with ORA-1555 on a busy OLTP system. The only DMLs are done to
dictionary tables to update stats (unless I seriously missing
something). Invalidation of execution plans caused by updating
statistics should have far more noticeable impact I believe.

2006/6/27, Wittenmyer Joel - CO <WITTENMYERJ@(protected)>:
> This sounds similar to a known bug with ASSM tablespaces. The stats job
> updates tables in SYSAUX. Those tables have indexes and up to 10.2.0.2 if
> an instance does massive DML (which the stats job does in our case.
> Terabyte oltp with daily data loads and many schemas) on segments in an ASSM
> tablespace that has indexes, the undo is unbelievable. In our case it
> produces 10x the undo / redo it normally would. It can cause not only
> ora-1555, but you can blow out the max extents (32767) for an undo segment.
> The 'workaround' of coalescing the indexes prior to running such DML is only
> minimally effective. The backport patch for previous versions in some cases
> flat doesn't work (I know from experience.) The only sure fix is to upgrade
> to 10.2.0.2, which I am told definitely fixes the issue, and which I am
> preparing to do on several production instances even thought I HATE applying
> the latest patchset (hornet's nest). Of course, if you are already on
> 10.2.0.2 and are seeing this, please let me know!


--
Best regards,
Alex Gorbachev

http://blog.oracloid.com
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