Setting of PARALLEL_EXECUTION_MESSAGE_SIZE not in allowed range

Question

Hi,
I have a question concerning the database handling of parameters, which are not in a valid range.
The DBAs adjusted the parameter of PARALLEL_EXECUTION_MESSAGE_SIZE of an Oracle 10gR2 database instance on value 65536.
Regarding [Oracle documentation|http://download.oracle.com/docs/cd/B19306_01/server.102/b14237/initparams151.htm] the value 65536 is out of the valid range of 2148 to 65535.
How does the database handle such a configuration?
Does it fallback to the default value, probably 2148?
Is it possible to check, which value is active in the database?
Thanks in advance.

Answer 1

What a miniute !. First of all, I am surprised they managed to set it to 65536.
Assuming they wanted to change it using alter system set ..... scope=spfile; the would have got ORA-00068
SQL> alter system set PARALLEL_EXECUTION_MESSAGE_SIZE=65536 scope=spfile;
alter system set PARALLEL_EXECUTION_MESSAGE_SIZE=65536 scope=spfile
ERROR at line 1:
ORA-00068: invalid value 65536 for parameter parallel_execution_message_size,
must be between 2148 and 65535I am also not convinced also that they managed to change it in the initsid.ora file and started the database
SQL> create pfile from spfile;
File created.
SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> After editing your pfile
SQL> startup pfile=/u01/app/oracle/admin/testdb/pfile/inittestdb.ora
LRM-00122: value '65536' for 'PARALLEL_EXECUTION_MESSAGE_SIZE' must be between '2148' and '65535'
ORA-01078: failure in processing system parameters
SQL>And they couldn't have changed it dynamically
SQL> alter system set PARALLEL_EXECUTION_MESSAGE_SIZE=65536;
alter system set PARALLEL_EXECUTION_MESSAGE_SIZE=65536
ERROR at line 1:
ORA-02095: specified initialization parameter cannot be modified
SQL> So how could they set it to 65536 in the first place.
Meanwhile to see what is set, use
SQL> show parameter PARALLEL_EXECUTION_MESSAGE_SIZE
NAME                                 TYPE        VALUE
parallel_execution_message_size      integer     2152
SQL>