Hi, I've found answer to first question . I must use tnsnames (or ldap) for TAF http://download-uk.oracle.com/docs/cd/B19306_01/network.102/b14212/namin g.htm#i498306 "Using Easy Connect Naming on the Client Clients can connect to a database server using easy connect naming if the following conditions are met: * Oracle Database 10g Net Services software installed on the client. * Oracle TCP/IP protocol support on both the client and database server * No features requiring a more advanced connect descriptor are required For large or complex environments where advanced features, such as connection pooling <http://download-uk.oracle.com/docs/cd/B19306_01/network.102/b14212/glos sary.htm#i997500> , external procedure <http://download-uk.oracle.com/docs/cd/B19306_01/network.102/b14212/glos sary.htm#i434248> calls, or Heterogeneous Services <http://download-uk.oracle.com/docs/cd/B19306_01/network.102/b14212/glos sary.htm#i434257> , which require additional connect information, are desired, easy connect naming is not suitable. In these cases, another naming method is recommended." IMPORTANT: The contents of this email and any attachments are confidential and proprietary to ECtel Ltd. They are intended for the named recipient(s) only. If the reader of this message is not the intended recipient, you are hereby notified that any dissemination, use, distribution or copying of this communication is strictly prohibited and may be unlawful. If you have received this email in error, please notify us immediately by replying to the message and deleting it from your computer.