Oracle Instant Client enables development and deployment of applications that connect to Oracle Database, either on-premise or in the Cloud. The Instant Client libraries provide the necessary network connectivity and advanced data features to make full use of Oracle Database. The libraries are used by the Oracle APIs of popular languages and environments including Python, Node.js, Go, PHP and Ruby, as well as providing access for Oracle Call Interface (OCI), Oracle C++ Call Interface (OCCI), JDBC OCI, ODBC and Pro*C applications. Tools included in Instant Client, such as SQL*Plus, SQL*Loader and Oracle Data Pump, provide quick and convenient data access.
Instant Client RPM packages for Oracle Linux can now be installed from yum.oracle.com for Oracle Linux 8 and Oracle Linux 7. Older releases are available for Oracle Linux 8, Oracle Linux 7 and Oracle Linux 6.
See Instant Client for Oracle Linux for installation instructions.
Oracle recommends using the latest 19c Release Update of Oracle Instant Client
or Oracle Database Client. This is a Long Term Release.
Alternatively you can use the latest 21c Release Update if you require client features introduced in this Innovation Release.
Deploy applications using Instant Client in the cloud, or connect to a cloud database.
Whether your applications are in the cloud or on-premise, you can install Instant Client and connect to cloud databases. Follow the normal installation process for your operating system. Some cloud-specific references are shown below.
DigiCert retired the Organizational Unit (OU) field for all public TLS/SSL
certificates to comply with industry standards as of August 2022. This means
that public TLS/SSL certificates issued by DigiCert will no longer have an OU
field. Refer to MOS note 2911553.1
To avoid disruption to applications connecting to Oracle Autonomous Database on Shared Exadata Infrastructure (ADB-S) during the server side certificate change, you must use hostname based matching of the server certificate.
The following versions of Oracle Instant Client automatically support hostname based matching:
Versions: 18.19 (or later), 19.2 (or later), 21 (base release or later)
To connect to multiple Oracle Autonomous Database instances from within one application process, use Oracle Instant Client 19.17, or later, or use Instant Client 21c.
If you are using mTLS connections, put each wallet's cwallet.sso file in a unique directory. Concatenate the tnsnames.ora file entries from all wallets into a single tnsnames.ora file. Make a copy of one sqlnet.ora file and remove the WALLET_LOCATION line. Alter each connection descriptor in your new tnsnames.ora file and add a WALLET_LOCATION clause set to the directory containing the cwallet.sso file for the relevant database. See the Database Net Services Reference for an example. Configure your application to use the new tnsnames.ora and sqlnet.ora files, for example by placing them both in the "network/admin" sub-directory of your Instant Client installation. Your application can now use the appropriate network alias from the tnsnames.ora file to connect to each database service.
|Instant Client Package||Description||References|
|Basic||All files required to run OCI, OCCI, and JDBC OCI applications for Oracle Database||OCI
|Basic Light||Smaller version of the Basic package, with only English error messages and Unicode, ASCII, and Western European character set support||OCI
|SDK||Additional header files and an example makefile for developing OCI and OCCI applications|
|SQL*Plus||Additional package providing the SQL*Plus command-line tool for executing SQL and PL/SQL statements and scripts||SQL*Plus|
|Tools||Additional tools including Data Pump, SQL*Loader and Workload Replay Client||Data Pump and SQL*Loader
|ODBC||Additional libraries providing ODBC||ODBC|
|Precompilers||Additional tools and libraries providing the Pro*C and Pro*COBOL precompilers||Pro*C
|JDBC OCI Supplement||Additional libraries to support Internationalization||JDBC OCI|