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Oracle® OPatch User's Guide
10g Release 2 (10.2) for Windows and UNIX

Part Number E15294-01
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1 Introduction and Requirements

Patches are a small collection of files copied over an existing installation. They are associated to particular versions of Oracle Products. When applied to the correct version of an installed product, patches result in an upgraded version of the product.

The OPatch Java-based utility enables the application and rollback of interim patches to Oracle's software. OPatch is platform-independent and runs on all supported operating systems.

This chapter discusses the following introductory and advisory topics:

OPatch Features

The OPatch 10.2 utility has the following features:

OPatch supports the following capabilities:

Requirements for OPatch

The OPatch utility requires the following items:

Environment Variables OPatch Uses

OPatch uses the following environment variables:

ORACLE_HOME — Oracle home location."Recovering from a Failed Patching Session Using OPatch"

OPATCH_DEBUG — Log level that specifies the amount of logging OPatch should perform.

OPATCH_PLATFORM_ID — Unique platform ID.

PATH — Path information.

Backup Recommendations

It is highly recommended that you back up the ORACLE_HOME before any patch operation. You can back up the ORACLE_HOME using your preferred method. You can use any method, such as zip, cp -r, tar, and cpio to compress the ORACLE_HOME.

For recovery information, see "Recovering from a Failed Patching Session Using OPatch" on page 7E2.