Developing Portable Applications : 2. Achieving Transparency and Portability : Supported Gateway Statements : Oracle Server Statements
 
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Oracle Server Statements
The DIRECT EXECUTE IMMEDIATE statement allows you to use the Oracle statements shown in the following list with the gateway.
Note:  This list is not exhaustive. Other statements may also work.
alter cluster
create cluster
alter database
create database
alter index
create database link
alter rollback segment
create rollback segment
alter sequence
create sequence
alter table
create synonym
alter tablespace
drop cluster
alter user
drop database
Statement Restrictions — Oracle
The following restrictions are imposed on which statements may be issued using DIRECT EXECUTE IMMEDIATE:
• When specifying numeric literals in DIRECT EXECUTE IMMEDIATE, always use a period (“.”) as the decimal point. Doing so is necessary because the gateway internally sets the NLS_NUMERIC_CHARACTERS and always uses “.” as the decimal point when data is passed to and from the database.
• Any command that is specific to an Oracle tool, that is, not a DBMS statement, is not supported with a DIRECT EXECUTE IMMEDIATE statement. For example, the SQL*Plus describe command is not supported.
Note:  You must execute all Oracle utilities directly on the host operating system because they are not available through the gateway.