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What is the difference between instant client and the original Oracle client? The Oracle client is almost 800MB and the instant client is not so much. I need to install oracle client, ODBC drivers and JDBC drivers. What is the best way to go and which one should I choose? The original 800 megs client or the instant client?

  • The JDBC driver does not need any installation at all. And it also does not need an Oracle client. All you need to do is to copy the driver's jar file to the client where the Java program is running. – a_horse_with_no_name Jul 22 '15 at 10:10
  • @a_horse_with_no_name okay and what about ODBC? – tesla747 Jul 22 '15 at 10:13
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The Instant Client is easier to install and more lightweight. It doesn't even need to be installed, you can just unzip it and use it. You don't need an Oracle Home either.

On the other hand, it does not support deprecated features like Oracle Names. If you don't need any feature the instant client omits, I suggest you use it. It looks like you are covered by the list of what is supported:

Instant Client can be used to run your OCI, OCCI, Pro*C, JDBC, and ODBC applications without installing a full Oracle Client. In addition, Instant Client supports SQL*Plus. As of Instant Client 10.2, it is also possible to develop applications for OCI and OCCI using the Instant Client SDK download.

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  • Yes it worked. So now to connect to a remote database from my application server where I have installed the instant client, how to give the respective tns entries.? so that I can connect to the particular database. – tesla747 Jul 22 '15 at 8:12
  • I typically add a tnsnames.ora file in the Instant Client's directory and set the TNS_ADMIN environment variable to point to the tnsnames.ora location. – hooinator Jul 22 '15 at 12:52
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If you are using Oracle Wallet for a secure connection , Instant Client does not support it, where as Regular sqlplus supports

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