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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

Re: ORA-4030

Carol Spencer

2004-02-06

Replies:
Because each dedicated connection (thread) has a reserved stack size of 1M, the actual virtual memory reserved by Oracle is larger than the memory you are probably watching. Check the virtual memory for the oracle process in task manager (in the Processes tab, select the "Virtual Memory" column from the View), or use PerfMon and select the process object for oracle, selecting virtual memory.

You may see it near 3GB, causing new memory allocations to fail. (Also, make sure that you do have a 2GB page file.)

If you have quite a few connections, using orastack will often allow you more connections (in addition to adjusting pga_aggregate_target or sort/hash area sizes). Using indirect data buffers, as suggested, is also a possibility, but don't forget that you have to reserve an Window size (the default is 1GB), so you really don't get all that lower memory for PGA (shared pool and log will also be in the lower memory).
Regards, Carol Spencer






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