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Commit60b198a

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Update FAQ_DEV: elog => ereport.
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‎doc/FAQ_DEV

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Developer's Frequently Asked Questions (FAQ) for PostgreSQL
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Last updated:Mon Jun 2 00:34:39 EDT 2003
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Last updated:Wed Oct 29 21:40:18 EST 2003
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Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
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2.3) Why do we use Node and List to make data structures?
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2.4) I just added a field to a structure. What else should I do?
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2.5) Why do we use palloc() and pfree() to allocate memory?
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2.6) What iselog()?
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2.6) What isereport()?
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2.7) What is CommandCounterIncrement()?
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_________________________________________________________________
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are special non-query contexts that memory can be allocated in. These
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affect when the allocated memory is freed by the backend.
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2.6) What iselog()?
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2.6) What isereport()?
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elog() is used to send messages to the front-end, and optionally
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ereport() is used to send messages to the front-end, and optionally
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terminate the current query being processed. The first parameter is an
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elog level of DEBUG (levels 1-5), LOG, INFO, NOTICE, ERROR, FATAL, or
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PANIC. NOTICE prints on the user's terminal and the postmaster logs.
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INFO prints only to the user's terminal and LOG prints only to the
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server logs. (These can be changed from postgresql.conf.) ERROR prints
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in both places, and terminates the current query, never returning from
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the call. FATAL terminates the backend process. The remaining
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parameters of elog are a printf-style set of parameters to print.
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elog(ERROR) frees most memory and open file descriptors so you don't
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need to clean these up before the call.
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ereport level of DEBUG (levels 1-5), LOG, INFO, NOTICE, ERROR, FATAL,
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or PANIC. NOTICE prints on the user's terminal and the postmaster
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logs. INFO prints only to the user's terminal and LOG prints only to
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the server logs. (These can be changed from postgresql.conf.) ERROR
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prints in both places, and terminates the current query, never
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returning from the call. FATAL terminates the backend process. The
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remaining parameters of ereport are a printf-style set of parameters
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to print.
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ereport(ERROR) frees most memory and open file descriptors so you
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don't need to clean these up before the call.
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2.7) What is CommandCounterIncrement()?
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‎doc/src/FAQ/FAQ_DEV.html

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<H1>Developer's Frequently Asked Questions (FAQ) for
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PostgreSQL</H1>
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<P>Last updated:Mon Jun 2 00:34:39 EDT 2003</P>
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<P>Last updated:Wed Oct 29 21:40:18 EST 2003</P>
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<P>Current maintainer: Bruce Momjian (<Ahref=
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"mailto:pgman@candle.pha.pa.us">pgman@candle.pha.pa.us</A>)<BR>
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should I do?<BR>
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<Ahref="#2.5">2.5</A>) Why do we use<I>palloc</I>() and
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<I>pfree</I>() to allocate memory?<BR>
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<Ahref="#2.6">2.6</A>) What iselog()?<BR>
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<Ahref="#2.6">2.6</A>) What isereport()?<BR>
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<Ahref="#2.7">2.7</A>) What is CommandCounterIncrement()?<BR>
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<BR>
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memory can be allocated in. These affect when the allocated memory
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is freed by the backend.</P>
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<H3><Aname="2.6">2.6</A>) What iselog()?</H3>
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<H3><Aname="2.6">2.6</A>) What isereport()?</H3>
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<P><I>elog()</I> is used to send messages to the front-end, and
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<P><I>ereport()</I> is used to send messages to the front-end, and
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optionally terminate the current query being processed. The first
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parameter is anelog level of<I>DEBUG</I> (levels 1-5),<I>LOG,</I>
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parameter is anereport level of<I>DEBUG</I> (levels 1-5),<I>LOG,</I>
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<I>INFO,</I><I>NOTICE,</I><I>ERROR,</I><I>FATAL,</I> or
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<I>PANIC.</I><I>NOTICE</I> prints on the user's terminal and the
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postmaster logs.<I>INFO</I> prints only to the user's terminal and
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<I>LOG</I> prints only to the server logs. (These can be changed
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from<I>postgresql.conf.</I>)<I>ERROR</I> prints in both places,
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and terminates the current query, never returning from the call.
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<I>FATAL</I> terminates the backend process. The remaining
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parameters of<I>elog</I> are a<I>printf</I>-style set of
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parameters of<I>ereport</I> are a<I>printf</I>-style set of
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parameters to print.</P>
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<P><I>elog(ERROR)</I> frees most memory and open file descriptors so
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<P><I>ereport(ERROR)</I> frees most memory and open file descriptors so
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you don't need to clean these up before the call.</P>
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<H3><Aname="2.7">2.7</A>) What is CommandCounterIncrement()?</H3>

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