使用leading和use_nl可以设置表的查询顺序,来加快查询速度, 比如有a,b,c,d四张表,a表的数据最少,如下设置 select /*+ leading(a) use_nl(a,b,c,d) index(a.id)*/ a.id from A 一般会将小表列为第一位 使用index直接匹配索引来查询数据提交查询速度...
SELECT /+INDEX_FFS(BSEMPMS IN_DPTNO,IN_EMPNO,IN_SEX)/ * FROM BSEMPMS WHERE EMP_NO='SCOTT' AND DPT_NO='TDC306'; /+USE_CONCAT/ 对查询中的WHERE后面的OR条件进行转换为UNION ALL的组合查询. 例如: SELECT /+USE_CONCAT/ * FROM BSEMPMS WHERE DPT_NO='TDC506' AND SEX='M'; /+NO_EXPAN...
65、AUDIT, COMMENT, DELETE, GRANT, INDEX, INSERT, LOCK, RENAME, SELECT, UPDATE, REFERENCES, and EXECUTE. Positions 14, 15, and 16 are reserved for future use. The characters are: - for none, S for success, F for failure, and B for both).COMMENT_TEXTVARCHAR2(4000)Text comment on th...
SELECT /*+ ORDERED INDEX (b, jl_br_balances_n1) USE_NL (j b)USE_NL (glcc glf) USE_MERGE (gp gsb) */b.application_id, b.set_of_books_id ,b.personnel_id, p.vendor_id Personnel,p.segment1 PersonnelNumber, p.vendor_name NameFROM jl_br_journals j, jl_br_balances b,gl_code_...
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create index IDX_T_01 on T(object_id); 假设要删除的索引名称是IDX_T_01,使用下面语句开启该索引的监控。 alter index jingyu.IDX_T_01 monitoring usage; 索引是否使用到,会在具体业务schema下的v$object_usage视图中体现(具体观察USED这一列的值,如果是NO,说明自监控以来该索引从未使用过) ...
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alter indexCC.IDX_T_MATCH_IDmonitoring usage; 索引监控一般也不会只监控一个索引,一个表或者多个表甚至整个 SCHEMA 的索引都需要监控。如下使用 DBA 用户查到的 T_MATCH 表的所有索引都需要监控,则执行如下 SQL 的输出则可以监控整个表的索引使用情况。
Index created. LEO@orcl> exec dbms_stats.gather_table_stats('LEO','TEST',cascade => true); PL/SQL procedure successfully completed. LEO@orcl> create table test01 as select x,'T1' name from test where x<10000; Table created. 2.2、生成trace文件 ...
Use the following pull command for the latest: Copied to Clipboard docker pull container-registry.oracle.com/database/free:latest For details, see theOracle Container Registry. Run the Oracle Database Enterprise Edition Container Image with Docker ...