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;
hints extensible optimization, 21-18 PARALLEL, 23-17 PARALLEL_INDEX, 23-17 histograms, 21-9 historical database maintenance operations, 11-47 partitions, 11-6 HP's OpenView, 30-33 I IBM's NetView/6000, 30-33 ILMS, 15-21 immediate constraints, 25-24 IMP_FULL_DATABAS...
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); ...
24、stent gets 0 physical reads 0 redo size 0 bytes sent via SQL*Net to client 0 bytes received via SQL*Net from client 0 SQL*Net roundtrips to/from client 0 sorts (memory) 0 sorts (disk)rows processedHints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...
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); ...
Filed under: Execution plans,Index skip scan,Indexing,Nested Loop,Oracle— Jonathan Lewis @ 3:59 pm GMT Mar 4,2021 One of the less well-known hints is the hint /*+ use_nl_with_index() */ (link to 19c reference manual) which appeared in the 10g timeline. I may be wrong but I...
0 sorts (disk) rows processed 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...