Oracle PL/SQL之函数索引（Function-based indexes）使用示例

函数索引（Function-based indexes）只有在where条件使用了与索引中相同的基于相同列的函数时才起作用。 duzz$scott@orcl>set autotrace on<br> duzz$scott@orcl>create table t1 as select * from dept;<p> <p>Table created.</p> <p>Elapsed: 00:00:00.01<br> duzz$scott@orcl>create index loc_idx on t1(upper(loc));</p> <p>Index created.</p> <p>Elapsed: 00:00:00.06<br> duzz$scott@orcl>select * from t1 where deptno=20;</p> <p> DEPTNO DNAME LOC<br> ———- —————————————— ————<br> 20 RESEARCH DALLAS</p> <p>Elapsed: 00:00:00.00</p> <p>Execution Plan<br> ———————————————————-<br> Plan hash value: 3617692013</p> <p>————————————————————————–<br> | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |<br> ————————————————————————–<br> | 0 | SELECT STATEMENT | | 1 | 30 | 3 (0)| 00:00:01 |<br> |* 1 | TABLE ACCESS FULL| T1 | 1 | 30 | 3 (0)| 00:00:01 |<br> ————————————————————————–</p> <p>Predicate Information (identified by operation id):<br> —————————————————</p> <p> 1 – filter(“DEPTNO”=20)</p> <p>Note<br> —–<br> – dynamic sampling used for this statement</p> <p>Statistics<br> ———————————————————-<br> 48 recursive calls<br> 0 db block gets<br> 12 consistent gets<br> 0 physical reads<br> 0 redo size<br> 533 bytes sent via SQL*Net to client<br> 385 bytes received via SQL*Net from client<br> 2 SQL*Net roundtrips to/from client<br> 0 sorts (memory)<br> 0 sorts (disk)<br> 1 rows processed</p> <p>duzz$scott@orcl>select * from t1 where loc=’DALLAS’;</p> <p> DEPTNO DNAME LOC<br> ———- —————————————— —————–<br> 20 RESEARCH DALLAS</p> <p>Elapsed: 00:00:00.00</p> <p>Execution Plan<br> ———————————————————-<br> Plan hash value: 3617692013</p> <p>————————————————————————–<br> | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |<br> ————————————————————————–<br> | 0 | SELECT STATEMENT | | 1 | 30 | 3 (0)| 00:00:01 |<br> |* 1 | TABLE ACCESS FULL| T1 | 1 | 30 | 3 (0)| 00:00:01 |<br> ————————————————————————–</p> <p>Predicate Information (identified by operation id):<br> —————————————————</p> <p> 1 – filter(“LOC”=’DALLAS’)</p> <p>Note<br> —–<br> – dynamic sampling used for this statement</p> <p>Statistics<br> ———————————————————-<br> 5 recursive calls<br> 0 db block gets<br> 8 consistent gets<br> 0 physical reads<br> 0 redo size<br> 533 bytes sent via SQL*Net to client<br> 385 bytes received via SQL*Net from client<br> 2 SQL*Net roundtrips to/from client<br> 0 sorts (memory)<br> 0 sorts (disk)<br> 1 rows processed</p> <p>duzz$scott@orcl>select </p> </div> <div class="bq"> <p>转载请注明：<a href="https://94ip.com/" target="_blank">IT运维空间</a> » <a href="https://94ip.com/category-26.html" target="_blank">Mssql</a> » <a href="https://94ip.com/post/27576.html">Oracle PL/SQL之函数索引（Function-based indexes）使用示例</a></p> </div> <div class="related"> <h5>你可能喜欢:</h5> <ul> <li> <a href="https://94ip.com/post/27897.html" title="Oracle数据库PL/SQL Developer查询结果显示问号乱码的解决方法"> <div class="img"> <img src="https://94ip.com/zb_users/theme/ydconcise/include/random/5.jpg" alt="Oracle数据库PL/SQL Developer查询结果显示问号乱码的解决方法"> </div> <p>Oracle数据库PL/SQL Developer查询结果显示问号乱码的解决方法</p> </a> </li> <li> <a href="https://94ip.com/post/27873.html" title="MySQL与Oracle的语法区别详细对比 （转）"> <div class="img"> <img src="https://94ip.com/zb_users/theme/ydconcise/include/random/2.jpg" alt="MySQL与Oracle的语法区别详细对比 （转）"> </div> <p>MySQL与Oracle的语法区别详细对比 （转）</p> </a> </li> <li> <a href="https://94ip.com/post/27867.html" title="sql数据库在登录异常时 ora-03114：未连接到ORACLE怎么办"> <div class="img"> <img src="/zb_users/upload/2023/02/25/20230213102324-63ea0f9c05cb8.jpg" alt="sql数据库在登录异常时 ora-03114：未连接到ORACLE怎么办"> </div> <p>sql数据库在登录异常时 ora-03114：未连接到ORACLE怎么办</p> </a> </li> <li> <a href="https://94ip.com/post/27828.html" title="mysql的sql筛选排重最大值并修改其属性"> <div class="img"> <img src="https://94ip.com/zb_users/theme/ydconcise/include/random/2.jpg" alt="mysql的sql筛选排重最大值并修改其属性"> </div> <p>mysql的sql筛选排重最大值并修改其属性</p> </a> </li> <li> <a href="https://94ip.com/post/27812.html" title="python3 UnicodeEncodeError错误，cx_oracle模块执行sql报错：UnicodeEncodeError: &#8216;ascii&#8217; 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