Hints是Oracle提供的一个辅助用法,按字面理解就是‘提示’的意思,确实它起得作用也是提示优化器按它所提供的关键字来选择执行路径,特别适用于sql调整的时候。使用方法如下: {DELETE|INSERT|SELECT|UPDATE} /*+ hint [text] [hint[text]]... */ 具体可参考Oracle SQL Reference。 有了前面这些知识点,接下来让...
Hints是Oracle提供的一个辅助用法,按字面理解就是‘提示’的意思,确实它起得作用也是提示优化器按它所提供的关键字来选择执行路径,特别适用于sql调整的时候。使用方法如下: {DELETE|INSERT|SELECT|UPDATE} /*+ hint [text] [hint[text]]... */ 具体可参考Oracle SQL Reference。 有了前面这些知识点,接下来让...
Hints是Oracle提供的一个辅助用法,按字面理解就是‘提示’的意思,确实它起得作用也是提示优化器按它所提供的关键字来选择执行路径,特别适用于sql调整的时候。使用方法如下: {DELETE|INSERT|SELECT|UPDATE} /*+ hint [text] [hint[text]]... */ 具体可参考Oracle SQL Reference。 有了前面这些知识点,接下来让...
Also, be vary of issuing hints that conflict with an index hint. In this index hint example, the full hint is not consistent with an index hint: select /*+ full(c) index(c cust_primary_key_idx) */ * from customer c;
链接:https://www.eygle.com/archives/2006/02/index_hints_usage.html 虽然索引并不总会快于全表扫描,但是很多时候我们希望Oracle使用索引来执行某些SQL,这时候我们可以通过index hints来强制SQL使用index. Index Hints的格式如下: /*+INDEX( table [index [index]...] ) */ ...
You can specify multiple index hints: SELECT * FROM t1 USE INDEX (i1) IGNORE INDEX FOR ORDER BY (i2) ORDER BY a; It is not an error to name the same index in several hints (even within the same hint): SELECT * FROM t1 USE INDEX (i1) USE INDEX (i1,i1); ...
hardware requirements, 3.1 hints, Oracle hints, general limitations, 2.3.1.2 HOLD parameter, known restriction with EXEC SQL COMMIT HOLD command, 2.3.2.4 host variable, for Oracle hints (known problem), 2.3.1.2IIBM Application Requester Driver (ARD) interface data from Oracle server is translated...
Oracle Database - Enterprise Edition - Version 9.2.0.1 to 11.2.0.2 [Release 9.2 to 11.2] Information in this document applies to any platform. Purpose This article explains how to specify index hints successfully. Troubleshooting Steps The format for an index hint is: ...
You can specify multiple index hints: SELECT*FROMt1USEINDEX(i1)IGNOREINDEXFORORDERBY(i2)ORDERBYa; It is not an error to name the same index in several hints (even within the same hint): SELECT*FROMt1USEINDEX(i1)USEINDEX(i1,i1); ...
- [Note 129385 - Database hints in Open SQL|https://service.sap.com/sap/support/notes/129385] Regards, Ramond Reply Former Member 2009 Nov 13 3:13 PM 0 Kudos 844 SAP Managed Tags: ABAP Testing and Analysis why do you need a hint, without WHERE condition Oracle should alway...