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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: A VLDB contest

Tanel Poder

2006-08-30

Replies:
A VLDB contest
Also, when your server process needs metadata for an ASM allocation unit which is not already cached in your databases memory, it needs to do an OCI call to ASM instance. This in turn will make an IPC call to ASM instance, possibly spawning a new ASM process.
 
And then ASM instance will read the metadata from disk, and pass it pack to the waiting server process, then the server process has to get onto CPU again to continue processing (for example loading rows into a table) - once it requires a next ASM allocation unit for itself...
 
Also, no FUD intended here. The few small to medium databases what I've (had to) set up with ASM have performed ok..
 
Tanel.
 


From: oracle-l-bounce@freelists.org [mailto:oracle-l-bounce@freelists.org] On Behalf Of Kevin Closson
Sent: Wednesday, August 30, 2006 07:39
To: Bobak, Mark; ORACLE-L
Subject: RE: 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.