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<h1 class="topictitle1">Cumulative PTF packages</h1>
<div><p><span><img src="./delta.gif" alt="Start of change" />Cumulative program temporary fix (PTF)
packages contain fixes for a given release of the <span class="keyword">i5/OS™</span> operating
system. The fixes contained in a cumulative PTF package are for the <span class="keyword">Licensed Internal Code</span> and most licensed programs
that can be installed on that operating system release.<img src="./deltaend.gif" alt="End of change" /></span></p>
<p>As the name implies, each package is cumulative; that is, it contains all
of the fixes from the previous package plus additional fixes released since
the previous package. Many, but not all, new fixes are included in cumulative
packages. The fixes that are not included are typically applicable only to
a specific user's situation or application. These fixes are not included for
general availability to avoid introducing unwanted change and potential programming
errors into a cumulative package where code quality has the highest priority.
When you order the cumulative PTF package, you also receive the most recent
database PTF group and the HIPER PTF group.</p>
<p>How often a cumulative package is available depends on the stage of the <span class="keyword">i5/OS</span> release life cycle. During
the first six months or so of general availability for a new release, a cumulative
package can be available as often as every four to six weeks. After that time,
cumulative packages are scheduled on a quarterly basis. After the <span class="keyword">i5/OS</span> release has been available
for a period of time, the frequency might decrease again. The frequency of
availability depends on the number of new fixes to be added to the package.</p>
<p><img src="./delta.gif" alt="Start of change" />You should install cumulative PTF packages quarterly in dynamic
environments and less frequently in stable ones. Also consider installing
cumulative fix packages before making major hardware or software changes to
your environment.<img src="./deltaend.gif" alt="End of change" /></p>
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzam8fixtypes1.htm" title="IBM provides you with a variety of fixes: cumulative program temporary fix (PTF) packages, fix groups, High Impact PERvasive (HIPER) fixes, and others.">Types of fixes</a></div>
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<div class="reltasks"><strong>Related tasks</strong><br />
<div><a href="rzam8fixinstallcum.htm" title="This topic describes the steps for installing a cumulative PTF package from a physical or virtual device.">Install cumulative PTF packages</a></div>
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