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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
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invalid number
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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
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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: A VLDB contest

Kevin Closson


A VLDB contest
Right, the ASM instance gives the pointer array info to the
consumer instances where it is cached in the shared pool.
I've not seen one iota of discussion on this list about how
Oracle maps a data block to an extent within an ASM diskgroup.
Must not be an interesting topic?
It is indeed using these pointers. Such mapping is never free. Volume
managers have always had to do that--but have always stored
such mappings in kernel memory. No FUD intended here. I just
wanted to get people curious about the topic.

From: Bobak, Mark [mailto:Mark.Bobak@il.proquest.com]
Sent: Tuesday, August 29, 2006 4:30 PM
To: kevinc@polyserve.com; ORACLE-L
Subject: RE: A VLDB contest

I don't have an 'ASM extent pointer array' at all in my ASM instance....
  1  select * from v$sgastat
  2  where name like '%ASM%'
  3* order by bytes
SQL> /
POOL         NAME                            BYTES
------------ -------------------------- ----------
shared pool  ASM rollback operations          2592
shared pool  ASM map operations               3360
shared pool  ASM db client                   11840
shared pool  ASM buffer object               37288
shared pool  ASM file                        75328
In my database instance that relies on ASM, however.....
  1   select * from v$sgastat
  2   where name like '%ASM%'
  3* order by bytes
SQL> /
POOL         NAME                            BYTES
------------ -------------------------- ----------
shared pool  ASM rollback operations          2592
shared pool  ASM map operations              16856
shared pool  ASM file                        19200
large pool   ASM map operations hashta      393216
shared pool  ASM extent pointer array      9527624

Mark J. Bobak
Senior Oracle Architect
ProQuest Information & Learning

Ours is the age that is proud of machines that can think and suspicious of men who try to.  --H. Mumford Jones, 1892-1980


From: oracle-l-bounce@freelists.org [mailto:oracle-l-bounce@freelists.org] On Behalf Of Kevin Closson
Sent: Tuesday, August 29, 2006 7:24 PM
Subject: A VLDB contest

Does anyone actually have ASM "put to the test" as they say? Anyone
have huge ASM extent pointer array areas within their shared pool? Anyone
have "ORA-4031-creeping syndrome" ?

For instance:
         select * from v$sgastat;
POOL         NAME                            BYTES
------------ -------------------------- ----------
 shared pool ASM extent pointer array 287097144

Anyone see 1GB or more?

Kevin Closson
Chief Architect, Oracle Database Solutions
PolyServe, Inc