with no prefixes local prefix index a huge difference

Hello world

I have a little problem on the partitioning and I didn't understand why. Here is my scenario:

I created a partitioned table, partition is a date column range partition ona, then I created 2 index a prefix, a non pre-fixed and both of them is local. When I run a query based on the partition column and another (that I've indexed) execution plans are really different. as an example:

  CREATE TABLE PART_HAREKET_TABLE (
    ISLEM_TAR DATE, -- MY PARTITION COLUMN
    ISLEM_REF VARCHAR2(10), -- INDEX COLUMN
    ... -- OTHER COLUMNS HERE
  );
  
-- load data to the table from one of my prod table...

  CREATE INDEX I_PART_HAREKET_1 ON PART_HAREKET_TABLE(ISLEM_TAR, ISLEM_REF) LOCAL;
  
  CREATE INDEX I_PART_HAREKET_2 ON PART_HAREKET_TABLE(ISLEM_REF) LOCAL;
  
  EXEC DBMS_STATS.GATHER_TABLE_STATS(USER, 'PART_HAREKET_TABLE', ESTIMATE_PERCENT => 100, CASCADE => TRUE);
After this, I run these queries:
  EXPLAIN PLAN FOR
  select /*+ INDEX(PART_HAREKET_TABLE, I_PART_HAREKET_1 ) */ * 
  from   part_hareket_table 
  where islem_tar = to_Date('22/01/2012','dd/mm/yyyy') and islem_ref like 'KN%';

execution plan:

-------------------------------------------------------------------------------------------------------------------------
| Id  | Operation                          | Name               | Rows  | Bytes | Cost (%CPU)| Time     | Pstart| Pstop |
-------------------------------------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT                   |                    |  1243 |   195K|    19   (0)| 00:00:01 |       |       |
|   1 |  PARTITION RANGE SINGLE            |                    |  1243 |   195K|    19   (0)| 00:00:01 |    62 |    62 |
|   2 |   TABLE ACCESS BY LOCAL INDEX ROWID| PART_HAREKET_TABLE |  1243 |   195K|    19   (0)| 00:00:01 |    62 |    62 |
|*  3 |    INDEX RANGE SCAN                | I_PART_HAREKET_1   |  1243 |       |     5   (0)| 00:00:01 |    62 |    62 |
-------------------------------------------------------------------------------------------------------------------------
 
Predicate Information (identified by operation id):
---------------------------------------------------
 
   3 - access("ISLEM_TAR"=TO_DATE(' 2012-01-22 00:00:00', 'syyyy-mm-dd hh24:mi:ss') AND "ISLEM_REF" LIKE 'KN%')
       filter("ISLEM_REF" LIKE 'KN%')
It is a good cost I think also as predicate info I see ISLEM_TAR and ISLEM_REF.

When I use this:
  EXPLAIN PLAN FOR
  select /*+ INDEX(PART_HAREKET_TABLE, I_PART_HAREKET_2 ) */ * 
  from   part_hareket_table 
  where islem_tar = to_Date('22/01/2012','dd/mm/yyyy') and islem_ref like 'KN%';

-------------------------------------------------------------------------------------------------------------------------
| Id  | Operation                          | Name               | Rows  | Bytes | Cost (%CPU)| Time     | Pstart| Pstop |
-------------------------------------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT                   |                    |  1243 |   195K|  8209   (1)| 00:01:55 |       |       |
|   1 |  PARTITION RANGE SINGLE            |                    |  1243 |   195K|  8209   (1)| 00:01:55 |    62 |    62 |
|*  2 |   TABLE ACCESS BY LOCAL INDEX ROWID| PART_HAREKET_TABLE |  1243 |   195K|  8209   (1)| 00:01:55 |    62 |    62 |
|*  3 |    INDEX RANGE SCAN                | I_PART_HAREKET_2   |   141K|       |   218   (1)| 00:00:04 |    62 |    62 |
-------------------------------------------------------------------------------------------------------------------------
 
Predicate Information (identified by operation id):
---------------------------------------------------
 
   2 - filter("ISLEM_TAR"=TO_DATE(' 2012-01-22 00:00:00', 'syyyy-mm-dd hh24:mi:ss'))
   3 - access("ISLEM_REF" LIKE 'KN%')
       filter("ISLEM_REF" LIKE 'KN%')
as you can see here, there is a huge cost difference and ISLEM_TAR (partitioned column) is also used as a filter not access. These indices are LOCAL

so I expect that second index (non-prefixed) would be more effective. because oracle already know which partition which must be read and this index is smaller (just a column a) so I thought, Oracle will find appropriate part partition index and will read just this score (for the index and table) thus rows.

even the time of the request are different, first we (prefix) brings data ms 0.031, second 0.375ms (no prefixes).

but it's not? what Miss me?

You may say that ' AS' operator cause than on the ISLEM_REF column. I also use it as equal "=",
for the first query costs 4, for a second, now cost 8. 2 again...

the partition size is approximately 440 MB

an example of similer is also here exist: index Local: prefix or no prefix

Jonathan Lewis made an example and it works very well...

My db:
Oracle Database 11g Enterprise Edition Release 11.2.0.2.0 - 64bit Production
PL/SQL Release 11.2.0.2.0 - Production
"CORE     11.2.0.2.0     Production"
TNS for IBM/AIX RISC System/6000: Version 11.2.0.2.0 - Production
NLSRTL Version 11.2.0.2.0 - Production

find the appropriate index part partition

Who is 62 of Partition of Index in both cases.

In both cases, there is a one-to-one correspondence between the partition table and the index partition.

However, in the second case, he expects to have to browse through the index entries 141thousand against only 1243 index entries in the first case. Oracle expects to have to read several index blocks in the second case.

I guess your partitions are per month and not per day. So an index that is located on ISLEM_TAR + ISLEM_REF of columns is a more 'fine' (i.e. more accurate) because it only reads the entries for that one day of the index.
In the second case, Oracle expects that it returns rowid for several days (which means more ROWID returned from the index) and will filter the lines that do not match the date target when he reads the table. You'll notice that the use of the second filter on date against the table - read more lines of the table (because more ROWID is returned by the index).

Hemant K Collette

Published by: Hemant K Collette on 10 July 2012 15:17
--Added clarification that 'fine' are "more accurate".

Tags: Database

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