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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: "session param valu" in x$ksmlru

fairlie rego


AFAIK "Session Param Value" chunks are allocated as freeable. But you can easily confirm the same by taking a heapdump at level 2 using the following command
alter system set events 'immediate trace name  heapdump level 2';

"Hameed, Amir" <Amir.Hameed@xerox.com> wrote:
The reason I speculated that these are freeabl is because in Steve Adams
book, the definition of freeable is that "Chunks contain objects that
are normally needed for the duration of a session call, and are freed
thereafter ...". Let's see i f Steve has some time to clarify this.

-----Original Message-----
From: Radoulov, Dimitre [mailto:cichomitiko@gmail.com]
Sent: Wednesday, February 08, 2006 11:37 AM
Cc: Hameed, Amir
Subject: Re: "session param valu" in x$ksmlru

>> It seems that these cause a lot of flushes. Are these chunks of type
>> "freeable"?
> The session param values (memory allocated at the start of each
> are large contiguous allocations.
> Once the regular pool is chunked up into 4K or smaller pieces large
> allocations should come from reserved pool.
> So, if you get ORA-04031 for an allocation such as this, the solution
> usually to increase the size of the reserved pool.

I *think* these allocations are not freeable as long as the session is
Correct me if I'm wrong.



Fairlie Rego
Senior Oracle Consultant
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