Links
• Home
• 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
SGA Free memory

SGA Free memory

2006-02-13       - By Christo Kutrovsky

Reply:     1     2     3     4     5     6     7     8  

On a related note, have you guys noticed the very large memories on a
"round" address with KSMCHCOM = 'permanent memor' and KSMCHCLS =
'perm' ?

SQL> select * from sys.x_$ksmsp where KSMCHCOM = 'permanent memor' and
KSMCHCLS = 'perm' and ksmchsiz > 10000000;

ADDR                   INDX    INST_ID   KSMCHIDX   KSMCHDUR KSMCHCOM
      KSMCHPTR           KSMCHSIZ KSMCHCLS   KSMCHTYP KSMCHPAR
-- ---- ---- --- -- ---- -- -- ---- -- -- ---- -- -- ---- --
-- ---- ---- --- -- ---- ---- --- -- ---- -- -- ----- -- ---- --
-- ---- ---- ---
0000002A97C66E18         13          1          1          1 permanent
memor  00000001BC0CD000   15899128 perm              0 00
0000002A97C669F8         25          1          1          1 permanent
memor  00000001BB0CD000   15596208 perm              0 00
0000002A97C66790         32          1          1          1 permanent
memor  00000001BA0CD000   15933896 perm              0 00
0000002A97C66370         44          1          1          1 permanent
memor  00000001B90CD000   15933896 perm              0 00
0000002A97C67388         90          1          1          1 permanent
memor  00000001B80CD000   13792800 perm              0 00
0000002A97C68A28        117          1          1          1 permanent
memor  00000001B70CD000   15902000 perm              0 00
0000002A97C68870        122          1          1          1 permanent
memor  00000001B60CD000   15851552 perm              0 00
0000002A97C68660        128          1          1          1 permanent
memor  00000001B50CD000   15109080 perm              0 00
0000002A97C68030        146          1          1          1 permanent
memor  00000001B40CD000   15886048 perm              0 00
0000002A97C692B0        185          1          1          1 permanent
memor  00000001B30CD000   14680096 perm              0 00
0000002A97BF2C78       6093          1          1          1 permanent
memor  00000001AF0CD000   15937376 perm              0 00

This looks to me like some kind of reserved memory, as I remember
seeing a couple of these disappear in favor of other areas.

Jonathan what other articles would you recommend for shared pool insides ?

--
Christo Kutrovsky
Senior Database/System Administrator
The Pythian Group



On 2/11/06, Jonathan Lewis <jonathan@(protected)> wrote:
>
> Thanks for the reference - interesting paper.
>
> Regards
>
> Jonathan Lewis
> http://www.oracle.com/technology/community/oracle_ace/ace1.html#lewis
>
> The Co-operative Oracle Users' FAQ
> http://www.jlcomp.demon.co.uk/faq/ind_faq.html
>
> Cost Based Oracle: Fundamentals
> http://www.jlcomp.demon.co.uk/cbo_book/ind_book.html
>
>
> -- -- Original Message -- --
> From: "Luca Canali" <Luca.Canali@(protected)>
> To: <oracle-l@(protected)>
> Sent: Friday, February 10, 2006 8:15 AM
> Subject: RE: SGA Free memory
>
>
> Hi Jonathan,
>
> >    loop
> >        detach some items from end of library cache LRU
> >        distribute items to shared pool free list - coalescing where
> possible
> >        check for large enough chunk on free list
> >        return if allocation succeeds
> >    end loop
> >
> >    There may be a limit on the number of times round the loop -
>
> Apparently the limit is 5 iterations (see Russell Green, OOW Sep. 2005)
>
> Regards,
> Luca
>
> -- ---- ---
> Luca Canali
> Information Technology Department
> European Organization for Nuclear Research
> CERN
> CH-1211 Geneva 23
> --
> http://www.freelists.org/webpage/oracle-l
>
>
>
>
> --
> http://www.freelists.org/webpage/oracle-l
>
>
>


--
Christo Kutrovsky
Senior Database/System Administrator
The Pythian Group
--
http://www.freelists.org/webpage/oracle-l