📄 oracle常见问题常用技巧-6.htm

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COUNT(1)
<p>----------</p>
<p>6427</p>
<p>Execution Plan</p>
<p>----------------------------------------------------------</p>
<p>0 SELECT STATEMENT Optimizer=CHOOSE (Cost=384 Card=1 Bytes=11)</p>
<p>1 0 SORT (AGGREGATE)</p>
<p>2 1 TABLE ACCESS (BY INDEX ROWID) OF 'T_MYTABS' (Cost=384 Card</p>
<p>=126 Bytes=1386)</p>
<p>3 2 INDEX (RANGE SCAN) OF 'I_MYTABS2' (NON-UNIQUE) (Cost=11</p>
<p>Card=126)</p>
<p>Statistics</p>
<p>----------------------------------------------------------</p>
<p>172 recursive calls</p>
<p>1 db block gets</p>
<p>5054 consistent gets</p>
<p>2206 physical reads</p>
<p>0 redo size</p>
<p>293 bytes sent via SQL*Net to client</p>
<p>359 bytes received via SQL*Net from client</p>
<p>2 SQL*Net roundtrips to/from client</p>
<p>5 sorts (memory)</p>
<p>0 sorts (disk)</p>
<p>1 rows processed</p>
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