32 lines
2.1 KiB
HTML
32 lines
2.1 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<head>
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<META http-equiv="Content-Type" content="text/html; charset=utf-8">
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<LINK rel="stylesheet" type="text/css" href="../../../rzahg/ic.css">
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<title>Security cache properties</title>
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</head>
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<BODY>
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<!-- Java sync-link -->
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<SCRIPT LANGUAGE="Javascript" SRC="../../../rzahg/synch.js" TYPE="text/javascript"></SCRIPT>
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<h4><a name="seccache"></a>Security cache properties</h4>
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<p>The following system properties determine the initial size of the primary and secondary hash table caches, which affect the frequency of rehashing and the distribution of the hash algorithms. The larger the number of available hash values, the less likely a hash collision occurs, and a slower retrieval time is more likely. If several entries compose a hash table cache, creating the table in a larger capacity supports more efficient hash entries than letting automatic rehashing determine the growth of the table. Rehashing causes every entry to move each time.</p>
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<ul>
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<li><p><strong>com.ibm.websphere.security.util.authCacheEnabled</strong>
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<br>This property determines whether the Subject cache is enabled for the process. When the Subject cache is disabled, a new Java Authentication and Authorization Service (JAAS) login occurs for every request, which results in a performance degradation. Disable the Subject cache with caution.</p></li>
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<li><p><strong>com.ibm.websphere.security.util.tokenCacheSize</strong>
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<br>This cache stores LTPA credentials in the cache, using the LTPA token as a lookup value. When using an LTPA token to login, the LTPA credential is created at the security server for the first time. This cache prevents the need to access the security server on subsequent logins using an LTPA token.</p></li>
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<li><p><strong>com.ibm.websphere.security.util.LTPAValidationCacheSize</strong>
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<br>Given the credential token for login, this cache returns the concrete LTPA credential object, without the need to revalidate at the security server. If the token has expired, revalidation is required.</p></li>
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</ul>
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</body>
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</html>
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