Guys,
create table Tab1 ( name varchar2(100),age int,state varchar2(100),country
varchar2(100));
insert into tab1 values ('SCOTT',25,'TN','India');
I have 20,00,000 records like above.
create index idx1 on tab1 (upper(name));
analyze table tab1 compute statistics;
analyze index idx1 compute statistics;
select age from tab1 where upper(name)='SCOTT'; ---> this will return around 50
records.
---------------------------------------------------------
0 SELECT STATEMENT Optimizer=CHOOSE (Cost=2458 Card=262146 Bytes=2097168)
1 0 TABLE ACCESS (FULL) OF 'TAB1' (Cost=2458 Card=262146 Bytes=2097168)
--- INIT.ORA ----------------------
optimizer_mode=choose
compatible=8.1.0
query_rewrite_enabled=true
query_rewrite_integrity=trusted
-----------------------------------
It's Oracle 8.1.6/Win2K.
When i add a HINT, IDX1 is used.Why is it so ?
Why this SELECT does not use index IDX1 w/o a hint ?
TIA.
Jp.
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