All Oracle Error Codes
Oracle DBA Forum

Frequent Oracle Errors

TNS:could not resolve the connect identifier specified
Backtrace message unwound by exceptions
invalid identifier
PL/SQL compilation error
internal error
missing expression
table or view does not exist
end-of-file on communication channel
TNS:listener unknown in connect descriptor
insufficient privileges
PL/SQL: numeric or value error string
TNS:protocol adapter error
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: TX locks

Jonathan Lewis


Other common causes of TX/4 waits on a TX/6

Bitmap indexes on OLTP tables - with updates to
the bitmapped column, or inserts/delete of rows.

Updates colliding on rows in IOTs.

Several variations of pk/fk activity split across
two sessions.


Jonathan Lewis


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----- Original Message -----
From: "Adams, Matthew (GE Consumer & Industrial)" <MATT.ADAMS@(protected)>
To: <oracle-l@(protected)>
Sent: Thursday, May 27, 2004 7:45 PM
Subject: RE: TX locks

The blocker has the TX enqueue with lmode=3D6, the requestor=20
is requesting a shared lock (lmode=3D4). =20

I've narrowed the issue down to two the same two possibilities
you mentioned:

1) The blocked transaction is attempting to insert the same PK/UK
values and is waiting to see if the first one commits or rolls back.

2) Lack of an available ITL slot in either the table or index. =20
Since maxtrans is set to 255, I'm leaning away from this, although
I am aware of the fact that if there is not enough space in the block=20
to increase the ITL from the default of one, it will wait rather than
expand the ITL, eventually timing out with this 2049 error. I think it =
be happening a little less frequently if this were the problem.

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