180 lines
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HTML
180 lines
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HTML
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<meta name="DC.Title" content="QHST history log" />
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<title>QHST history log</title>
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<body id="systl"><a name="systl"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">QHST history log</h1>
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<div><p>The history log (QHST) consists of a message queue and a physical
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file known as a log-version. </p>
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<p>Messages sent to the history log message queue (QHST) are written by the
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system to the current log version physical file. The history log contains
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a high-level trace of system activities such as system, subsystem, and job
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information, device status, and system operator messages.</p>
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<p>When a log-version is full, a new version of the log is automatically created.
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Each version is a physical file that is named in the following way: </p>
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<pre>Qxxxyydddn</pre>
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<p>where the following is true: </p>
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<dl><dt class="dlterm"><samp class="codeph">xxx</samp></dt>
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<dd>Is a 3-character description of the log type (HST)</dd>
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<dt class="dlterm"><samp class="codeph">yyddd</samp></dt>
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<dd>Is the Julian date of the first message in the log version</dd>
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<dt class="dlterm"><samp class="codeph">n</samp></dt>
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<dd>Is a sequence number within the Julian date (A through Z and 0 through
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9)</dd>
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</dl>
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<div class="note"><span class="notetitle">Note:</span> The number of records in each version of the history log is specified
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in the system value QHSTLOGSIZ. There is also a value of *DAILY to allow a
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new log version to be created each day instead of creating a new file based
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only on size.</div>
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<p>The text of the log version file contains the date and time of the first
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message and last message in the log version. The date and time of the first
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message are in positions 1-13 of the text; the date and time of the last message
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are in positions 14-26. The date and time are in the format cyymmddhhmmss,
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where: </p>
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<dl><dt class="dlterm"><samp class="codeph">c</samp></dt>
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<dd>Is the century guard digit</dd>
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<dt class="dlterm"><samp class="codeph">yymmdd</samp></dt>
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<dd>Is the date the message was sent</dd>
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<dt class="dlterm"><samp class="codeph">hhmmss</samp></dt>
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<dd>Is the time the message was sent</dd>
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</dl>
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<p>You can create a maximum of 36 log versions with the same Julian date.
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If more than 36 log versions are created on the same day, the next available
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Julian day is used for subsequent log versions. If some of the older log
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versions are then deleted, it is possible to use the names again. Log versions
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are out of order when sequenced by name if log versions are deleted and names
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used again.</p>
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<p>You can also write a program to process history log records. Because several
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versions of each log may be available, you must select the log-version to
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be processed. To determine the available log-versions, use the <span class="cmdname">Display
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Object Description (DSPOBJD)</span> command. For example, the following <span class="cmdname">Display
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Log (DSPLOG)</span> command displays what versions of the history log are
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available: </p>
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<pre>DSPOBJD OBJ(QSYS/QHST*) OBJTYPE(*FILE)</pre>
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<p>You can delete logs on your system by using the delete option from the
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display that is presented on the <span class="cmdname">Work with Objects (WRKOBJ)</span> command.</p>
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<p>You can display or print the information in a log using the <span class="cmdname">Display
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Log (DSPLOG)</span> command. You can select the information you want displayed
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or printed by specifying any combination of the following: </p>
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<ul><li>Period of time</li>
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<li>Name of job that sent the log entry</li>
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<li>Message identifiers of entries</li>
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</ul>
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<p>The following <span class="cmdname">Display Log (DSPLOG)</span> command displays
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all the available entries for the job OEDAILY in the current day: </p>
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<pre>DSPLOG JOB(OEDAILY)</pre>
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<p>The resulting display is: </p>
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<pre class="screen"> Display History Log Contents
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Job OEDAILY started
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Database file OEMSTR in library OELIB expired
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Job OEDAILY abnormally ended
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Job OEDAILY started
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Job OEDAILY ended
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Bottom
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Press Enter to continue.
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F3=Exit F10=Display all F12=Cancel
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</pre>
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<p>If you reset the system date or time to an earlier setting, or if you advanced
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the system date and time by more than 48 hours, a new log version is started.
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This ensures that all messages in a single log version are in chronological
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order.</p>
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<p>Log versions created on a release prior to V3R6M0 may contain entries that
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are not in chronological order if the system date and time was reset to an
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earlier setting. Therefore, when you try to display the log-version, some
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entries may be missed. For example, if the log-version contains entries dated
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1988 followed by entries dated 1987, and you want to display those 1987 entries,
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you specify the 1987 dates on the PERIOD parameter on the <span class="cmdname">Display
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Log (DSPLOG)</span> command but the expected entries are not displayed.
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You should always use the system date (QDATE) and the system time (QTIME),
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or you should specify the PERIOD parameter as follows: </p>
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<pre>PERIOD((start-time start-date) (*AVAIL *END))</pre>
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<p>The system writes the messages sent to a log message queue to the current
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log version physical file when the message queue reaches a certain size or
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when the <span class="cmdname">Display Log (DSPLOG)</span> command was used. If you
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want to ensure the current log version is up-to-date, specify a fictitious
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message identifier, such as <samp class="codeph">###0000</samp>, on the DSPLOG command.
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No messages are displayed, but the messages in the message queue are copied
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to the log version physical file to make it current.</p>
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<div class="note"><span class="notetitle">Note:</span> If a message is sent to QHST and the <span class="cmdname">Display Log (DSPLOG)</span> command
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is done immediately, the DSPLOG command will show messages from the log version
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physical file. Depending on the number of messages being copied to the log
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version, your message may not be shown until a second <span class="cmdname">Display Log
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(DSPLOG)</span> command is run later.</div>
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<p>If you print the information in a log using the <span class="cmdname">Display Log (DSPLOG)</span> command
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and output parameter *PRINT, (DSPLOG OUTPUT(*PRINT)), only one line from each
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message is printed, using the first 105 characters of each message.</p>
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<p>If you print the information in a log using the <span class="cmdname">Display Log (DSPLOG)</span> command
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and output parameter *PRTWRAP, (DSPLOG OUTPUT(*PRTWRAP)), messages
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longer than 105 characters are wrapped to include additional lines to a limit
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of 2000 characters.</p>
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<p>If you print the information in a log using the <span class="cmdname">Display Log (DSPLOG)</span> command
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and output parameter *PRTSECLVL, messages longer than 105 characters are wrapped
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to include additional lines to a limit of 2000 characters. The second-level
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message text is also printed if available, up to a maximum of 6000 characters.</p>
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<p>If you display the information in a log using the <span class="cmdname">Display Log
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(DSPLOG)</span> command, only 105 characters of message text are shown.
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Any characters after 105 characters are truncated at the right.</p>
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</div>
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<div>
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<ul class="ullinks">
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<li class="ulchildlink"><strong><a href="hlformat.htm">Format of the history log</a></strong><br />
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A database file is used to store the messages sent to a log message queue on the system. Because all records in a physical file have the same length and messages sent to a log have different lengths, the messages can span more than one record.</li>
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<li class="ulchildlink"><strong><a href="pqhst.htm">Process the QHST file</a></strong><br />
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If you use an HLL program to process the QHST file, keep in mind that the length of the message can vary with each occurrence of a message.</li>
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<li class="ulchildlink"><strong><a href="qhstjob.htm">QHST job start and completion messages</a></strong><br />
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The system performs special formatting of the job start and job completion messages.</li>
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<li class="ulchildlink"><strong><a href="dellf.htm">Delete QHST files</a></strong><br />
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Log-version physical files accumulate on a system and you should periodically delete old logs that are not needed.</li>
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</ul>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="mlogg.htm" title="There are two types of logs for messages: job logs and history logs.">Log messages</a></div>
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</div>
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