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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: Why we should use bind variables when we write code......

Wolfgang Breitling

2006-09-20

Replies:
In addition to my warning about "inappropriate" use of bind variables I am wondering how the 3,424 "identical except for literals" sql could cause the shared pool to become fragmented. They should be eligible to be aged out for new sql, including "identical except for literals" ones. Unless, of course, the application doesn't close the corresponding cursor. But that would be a different issue.
As some of you know I am working with Peoplesoft applications which are not particularly knownfamous for their use of bind variables. But I rarely encounter ora-04031 errors and when then they are caused by some other application/add-on, often 3rd party monitoring or administrative "utilities".

At 08:37 AM 9/19/2006, Bobak, Mark wrote:

So, last week, one of my instances starts getting ORA-4031s, and after a few minutes, comes crashing down when a background process (lmd0, I think it was) catches an ORA-4031.  So, with the instance down, it's a bit tough to see what happened.  So, we start things up again, and I start watching closely over the next few days.  Seems there's lots of code that doesn't bother with binds.  In some cases, there are a dozen non-sharable SQLs that are identical except for literals, in other cases, up to hundreds.  (Thanks to T.Kyte for the script that I'm using to identify non-sharable SQL.)  After a few days, I find the smoking gun.  One single SQL statement that has 3,424 copies that are identical except for literals.  (No, that's not a typo.)  This is taking up abour 75% of the 475M of shared pool that's dedicated to the sql area.  One single SQL statement, 75%.  Yikes!

Regards

Wolfgang Breitling
Centrex Consulting Corporation
www.centrexcc.com