ORA-16237: SGA specified for Logical Standby is too small
Cause : MAX_SGA must be at least 10 Megabytes for proper functioning of Logical Standby.
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
Specify the value of MAX_SGA to be greater than or equal to 10Mb. Alternatively, increase the shared_pool_size/sga_target so that 1/4 of it will amount to 10 Megabytes.
Well, the reason for above error is that i have taken the above script from a 11g database and running it on 10g database. 11g has bring some changes in password management. Below code is executed on 11g and user created successfully, which is expected result.