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46 lines
1.9 KiB
HTML
46 lines
1.9 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 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=iso-8859-1">
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<TITLE></TITLE>
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<META NAME="GENERATOR" CONTENT="OpenOffice 4.1.1 (Unix)">
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<META NAME="AUTHOR" CONTENT="alex ">
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<META NAME="CREATED" CONTENT="20130531;10003100">
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<META NAME="CHANGEDBY" CONTENT="Alex Peshkoff">
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<META NAME="CHANGED" CONTENT="20141127;15401600">
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<STYLE TYPE="text/css">
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<!--
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@page { size: 8.5in 11in; margin: 0.79in }
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P { margin-bottom: 0.08in }
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-->
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</STYLE>
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</HEAD>
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<BODY LANG="en-US" DIR="LTR">
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<P STYLE="margin-top: 0.17in; margin-bottom: 0.2in; page-break-after: avoid">
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<FONT FACE="Albany, sans-serif"><FONT SIZE=4>Compressing data passed
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over the wire.</FONT></FONT></P>
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<P STYLE="margin-bottom: 0in"><BR>
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</P>
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<P>In most of cases compressing data passed over the wire is useless
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– one spends more time to compress a packet of data than to
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pass it over the typical LAN. But for WAN access data compression may
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be rather efficient way to enhance performance, specially when it can
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provide instead package size decrees packages' number decrees –
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that's the case for Firebird when it transfers a lot of data like big
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result set. zlib library (<A HREF="http://www.zlib.net/">http://www.zlib.net/</A>)
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is used by Firebird to compress data passed over the wire.</P>
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<P>By default wire compression is off, to turn it on you should set
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“WireCompression=true” in Firebird configuration on
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client. Compression setting is done by client to let only some
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clients that really need it use compression. Server gets compression
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setting from client when connection is established. Certainly only
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Firebird 3 (or higher) wire protocol supports compression. When
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compression is turned on Z flag is shown in client/server version
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info – for example: LI-T3.0.0.31451 Firebird 3.0 Beta 1/tcp
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(fbs)/P13:Z.</P>
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<P><BR><BR>
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</P>
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<P><BR><BR>
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</P>
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</BODY>
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</HTML> |