Hi, I am just curious to know what is this undocumented init parameters mentioned below? What is the difference between java_pool_size and __java_pool_size SQL> show parameter _pool_size NAME TYPE VALUE ------------------------------------ ----------- ------------------ __java_pool_size big integer 48M __large_pool_size big integer 8M __shared_pool_size big integer 80M global_context_pool_size string java_pool_size big integer 4M large_pool_size big integer 4M olap_page_pool_size big integer 0 shared_pool_size big integer 8M streams_pool_size big integer 0 SQL> select * from v$version; BANNER ---------------------------------------------------------------- Oracle Database 10g Enterprise Edition Release 10.1.0.2.0 - Prod PL/SQL Release 10.1.0.2.0 - Production CORE 10.1.0.2.0 Production TNS for 32-bit Windows: Version 10.1.0.2.0 - Production NLSRTL Version 10.1.0.2.0 - Production