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<h1 class="topictitle1">Maximum capacities</h1>
<div><p>If you exceed system limitations you can experience an application
outage or a system outage. Avoid these types of outages by being aware of
the maximum capacities and system limitations in advance. </p>
<div class="p"><img src="./delta.gif" alt="Start of change" /> Even though system limitations can be difficult to predict,
this topic can help you understand your system's maximum capacity. The tables
in this topic itemize some of the capacity limitations and restrictions that
can affect the availability of large systems and their applications. For example,
an online application halts when the size of a file or the number of its
members reaches the size limitation. These tables list the limits or maximum
values for V5R4. Some of these maximum values are different (lower) on prior
releases. Also, there are environments or configurations where the actual
limit may be less than the stated maximum. For example, certain high-level
languages can have more restrictive limits. These limits can range from a
certain number of objects to memory limitations. Memory limitations are measured
in megabytes, gigabytes, and terabytes.<div class="note"><span class="notetitle">Note:</span> The values listed in this topic
represent theoretical limits, not thresholds or recommendations. Approaching
some of these limits may be unreasonable and can degrade performance. Therefore,
practical limits may be lower, depending on system size, configuration, and
application environment.</div>
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<ul class="ullinks">
<li class="ulchildlink"><strong><a href="rzampwhatnew.htm">What's new for V5R4</a></strong><br />
This topic highlights the changes made to this topic collection for V5R4.</li>
<li class="ulchildlink"><strong><a href="rzampprint.htm">Printable PDF</a></strong><br />
Use this to view and print a PDF of this information.</li>
<li class="ulchildlink"><strong><a href="rzampcluster.htm">Cluster limits</a></strong><br />
This topic provides system limits for clusters which include cluster software limits, OptiConnect limits, HSL OptiConnect loop limits, and SPD OptiConnect limits.</li>
<li class="ulchildlink"><strong><a href="rzampcomm.htm">Communications limits</a></strong><br />
This topic provides system limits for general communications configuration limits, SNA limits, TCP/IP limits, and communications trace service tool limits.</li>
<li class="ulchildlink"><strong><a href="rzampdbsql.htm">Database and SQL Limits</a></strong><br />
This topic provides links to system limit values that are related to database and SQL.</li>
<li class="ulchildlink"><strong><a href="rzampfilesys.htm">File system limits</a></strong><br />
This topic contains the values for the system limits that are related to file systems.</li>
<li class="ulchildlink"><strong><a href="rzampjournal.htm">Journal limits</a></strong><br />
This topic provides system limits for journals, such as the size of a journal receiver, the length of a single journal entry, and the maximum sequence number for journal entries.</li>
<li class="ulchildlink"><strong><a href="rzampsaverst.htm">Save and restore limits</a></strong><br />
This topic contains the values for the system limits that are related to save and restore, such as limits for the size of a save file and the size of an object that can be saved.</li>
<li class="ulchildlink"><strong><a href="rzampsecurity.htm">Security limits</a></strong><br />
This topic contains the values for the system limits that are related to security, such as limits on the length of passwords and the number of user profiles on a system.</li>
<li class="ulchildlink"><strong><a href="rzampwrkmgmt.htm">Work management limits</a></strong><br />
This topic contains the values for the system limits that are related to work management, such as limits on the number of jobs on a system, the number of active subsystems, and the number of jobs in a subsystem.</li>
<li class="ulchildlink"><strong><a href="rzampother.htm">Miscellaneous limits</a></strong><br />
This topic provides values for other system limits, such as the number of basic disk pools, the size of a user space, and the size of a message queue.</li>
<li class="ulchildlink"><strong><a href="rzampprev.htm">Related information for Maximum capacities</a></strong><br />
This topic provides links to other information related to Maximum capacities.</li>
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