Best index for Between operator

I have a table abc where create_date column with date datatype.
My table abc is having one million row,
my query is some thing like
select * from abc
where create_Date between :low_date and :high_date;
Ideally if I use the same query in my report it is taking 15 hrs for one month of data and in normal case it is doing Full Table Scan of abc.
So I want to create an index, Please let me know what type of index will give me the performance improvement. (expected 4 to 5 hours).

Alex wrote:
Hi,
Create a NON-Unique Bitmap Index for create_Date column.
CREATE INDEX Your_Index_Name ON Your_table_Name
(create_Date )
LOGGING
PARALLEL ( DEGREE Default INSTANCES Default );Even you ahve 1 million records, 15 hours is too far from the normal situation.
So ones after you create teh index check the report again.
if it takes more time then execute the same query in sql plus or any other sql interface and see how long it takes to retrive all details.
Sometimes this slowness can caused by the report you use. Not exactly from the sql query.Probably not a great idea since we have no idea what this table is, how it's loaded, if it's transactional or data-warehouse oriented.
Your "solution" could well cause a myriad of performance problems outside of the OP's original query. And it will almost certainly not be the solution to their problem. As i stated in my post, and you have also mentioned ... 15 hours to read 1 million rows is indicative of a serious problem, no single index is going to fix that.

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An example:
SQL> drop table test;
Table dropped.
SQL> create table test as select * from all_objects;
Table created.
SQL> select count(*) from test;
COUNT(*)
      9304
SQL> create index test_idx on test(object_id);
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Execution Plan
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| Id | Operation                   | Name     | Rows | Bytes | Cost (%CPU)| Ti
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Execution Plan
Plan hash value: 1389866015
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me     |
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:00:01 |
|* 2 |   INDEX RANGE SCAN | TEST_IDX | 1396 |       |     4   (0)| 00
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Execution Plan
Plan hash value: 1357081020
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|   0 | SELECT STATEMENT |      | 4529 |   336K|    36   (0)| 00:00:01 |
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user9990110 wrote:
Hi,
I have an association table:
SURROGATE_ID, CONTENT_TYPE, OWNER_ID, REF_COUNT
The SURROGATE_ID is an auto generated primary key.
There are about 5 different content type integers.
There are a huge number of OWNER_ID long integers, including a value of NOBODY_ID.
The refcount reflects the number of contents for that type with that owner.
I need a fast COUNT(*) query that for a given CONTENT_TYPE value, and a given OWNER_ID value, counts the number of rows (either zero or one) with REF_COUNT > 0.Define fast please.
user9990110 wrote:
My naive ploy would be orthogonal indices on CONTENT_TYPE, OWNER_ID, and REF_COUNT.I'm not sure i understand your use of the word orthogonal in this context, can you elaborate please?
user9990110 wrote:
And then construct a reasonable query not worrying about the order of the conditions:
where CONTENT_TYPE = :mytype and OWNER_ID = :myowner and REF_COUNT > 0
Can someone tell me the wisest index to use?
AndyDon't worry about the order of the conditions in your SQL, the cost based optimizer will handle that for you based on a plethora of factors.
Are you always going to query by content_type, owner_id and ref_count? How many other columns does this table have? You say 'big', but are you talking row wise, column wise, both?
My first instinct would be to index (in this order, and assuming this table has many other columns):
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OWNER_ID
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Best index for Between operator

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