| 0 | CREATE INDEX STATEMENT | | 8 | 152 | 3 (0)| 00:00:01 | | 1 | INDEX BUILD NON UNIQUE| IDX_T1 | | | | | | 2 | SORT CREATE INDEX | | 8 | 152 | | | | 3 | TABLE ACCESS FULL | T1 | 8 | 152 | 2 (0)| 00:00:01 | --- Note --- - estimated index si...
| 0 | ALTER INDEX STATEMENT | | 2072K| 9M| 461 | | 1 | INDEX BUILD NON UNIQUE| IDX_POLICY_ID | | | | | 2 | SORT CREATE INDEX | | 2072K| 9M| | | 3 | TABLE ACCESS FULL | TEST_INDEX | 2072K| 9M| 461 | 举例3 ( 注意和 举例1 比较 ) Rebuil online 方式 : SQL> ex...
The CREATE_INDEX_COST Procedure of the DBMS_SPACE package helps to estimate the size of creating an index on an existing table. The input is the DDL statement that will be used to create the index. The procedure will output the storage required to create the index. Usage Notes : The tabl...
如果要使用索引,需要与一个非空内容做组合索引:create index idx_t1_object_id on t1(object_id,0); 原object_id字段上的索引可以删除掉。为了避免这种情况,一般索引字段在设计表时,都设计为not null,同时就会杜绝col_name is null的写法。 一个例子: CDMBAS.BAS_PAPPVACTINFO表的PA_REQUNO , PA_ORDER 两...
You cannot add a partition to a global index because the highest partition always has a partition bound of MAXVALUE. If you wish to add a new highest partition, use the ALTER INDEX SPLIT PARTITION statement. If a global index partition is empty, you can explicitly drop it by issuing the ...
INDEX RANGE SCAN->TABLE ACCESS BY INDEX ROWID->SELECT STATEMENT,GOAL=ALL_ROWS 4、执行计划的含义 在执行计划中,我们重点关注访问表(TABLE ACCESS BY …… )的方式,常见的有三种: 1)TABLE ACCESS BY USER ROWID(通过ROWID的表存取) rowid的值是行的物理位置,通过rowid可以快速定位到目标数据上,这也是Orac...
INDEX RANGE SCAN —> TABLE ACCESS BY GLOBAL INDEX ROWID —> INDEX UNIQUE SCAN —> TABLE ACCESS BY INDEX ROWID —> NESTED LOOPS OUTER —> SORT GROUP BY —> SELECT STATEMENT, GOAL = ALL_ROWS 4、TABLE ACCESS BY 访问方式 表访问的几种方式:(非全部) ...
booleanisNCHAR(int index) isNCHAR (int) voidsetDatabaseChangeRegistration(DatabaseChangeRegistrationregistration) Associate a Database Change Registration object with this statement. voidsetLobPrefetchSize(int value) Overrides the LOB prefetch size for this statement. ...
0 SELECT STATEMENT Optimizer=CHOOSE (Cost=2 Card=1 Bytes=17) 1 0 SORT (AGGREGATE) 2 1 INDEX (RANGE SCAN) OF 'FBI' (NON-UNIQUE) (Cost=2 Card=381 Bytes=6477) 从SQL*Plus返回的执行计划我们可以看到,这次,Oracle对表不再全表扫描,而是先扫描索引,因为优化器可以知道FBI索引得存在。
Because the metadata is considered an integral part of the index, the CREATE INDEX statement was not written to the dump file. Action: Contact the developer of the index's implementation type. If this is an Oracle-supplied index (perhaps via a data cartridge), contact Oracle Worldwide ...