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Grammar, my boy, grammar :-(
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doc/src/sgml/ref/notify.sgml

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@@ -147,16 +147,16 @@ after the transaction is completed (either committed or aborted). Again, the
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reasoning is that if a notify were delivered within a transaction that was
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later aborted, one would want the notification to be undone somehow --- but
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the backend cannot "take back" a notify once it has sent it to the frontend.
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So notify events are delivered only between transactions. The upshot of this
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So notify events are only delivered between transactions. The upshot of this
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is that applications using <command>NOTIFY</command> for real-time signaling
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should try to keep their transactions short.
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<para>
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<command>NOTIFY</command> behaves rather like Unix signals in one important
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respect: if the same notify name is signaled multiple times in quick
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<command>NOTIFY</command> behaves like Unix signals in one important
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respect: if the same condition name is signaled multiple times in quick
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succession, recipients may get only one notify event for several executions
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of <command>NOTIFY</command>. So it is a bad idea to depend on the number
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of notifies received; instead use <command>NOTIFY</command> to wake up
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of notifies received. Instead, use <command>NOTIFY</command> to wake up
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applications that need to pay attention to something, and use a database
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object (such as a sequence) to keep track of what happened or how many times
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it happened.
@@ -201,8 +201,8 @@ table name, even if syntactically valid as a name. That is no longer required.
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<para>
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In <productname>Postgres</productname> releases prior to 6.4, the backend
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PID delivered in a notify message is always the PID of the frontend's own
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backend. So it is not possible to distinguish one's own notifies from other
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PID delivered in a notify message was always the PID of the frontend's own
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backend. So it was not possible to distinguish one's own notifies from other
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clients' notifies in those earlier releases.
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</REFSECT2>

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