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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

Script to overcome ORA-54 during DDL

Jeremiah Wilton

2004-06-25

Replies:
Sometimes when trying to perform DDL on really hot objects (heavy
read/DML), I get:

ORA-00054: resource busy and acquire with NOWAIT specified.

I guess this is because you need to obtain a library cache lock in
order to change the object definition. Since there is no enqueue
mechanism for this resource, you can't just 'lock table ... in
exclusive mode;' All that gives you is a DML lock.

One way to avoid this is to write a PL/SQL routine that uses DBMS_SQL
and spins trying to run the DDL, stopping only when it succeeds. This
seems to work most of the time.

Does anyone have a script for doing the above that they would like to
share?

Please don't tell me to just use dbms_redefinition. That is
unnecessarily complex when the above technique can be used instead.

Thanks

--
Jeremiah Wilton
http://www.speakeasy.net/~jwilton
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