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	<title>停止空想 &#187; 统计信息</title>
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		<title>返回了一行，为何card不为1？</title>
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		<pubDate>Mon, 05 Jun 2006 14:10:49 +0000</pubDate>
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				<category><![CDATA[Oracle]]></category>
		<category><![CDATA[stats]]></category>
		<category><![CDATA[统计信息]]></category>

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		<description><![CDATA[ops$tkyte@ORA920&#62; select * from t where object_id = 55;   Execution Plan &#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;-    0      SELECT STATEMENT Optimizer=CHOOSE (Cost=3 Card=13 Bytes=96)    1    0   TABLE ACCESS (BY INDEX ROWID) OF &#8216;T&#8217; (Cost=3 Card=13 Bytes=96)    2    1     INDEX (RANGE SCAN) OF &#8216;T_IDX&#8217; (NON-UNIQUE) (Cost=13 Card=1)   Statistics &#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;-           0  recursive calls           0  db block gets [...]]]></description>
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