ORA-1683 - Index Filled Up

Nov 10, 2010

We have Ora 10g and we have been encountering ORA-1683 error for the past 2 weeks. DBAs had extended the table space when we had this error for the first time however, we got the same error message again for the same index.

the reason behind getting the same error for the same index again and again?

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Oracle Text, 11.2.0.3.0
14:33:05 06/26/12 begin logging
14:33:05 06/26/12 event
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14:33:16 06/26/12
14:33:16 06/26/12
[code]....

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Let's consider such table that all rows fit into single block:

SQL> create table test as select rownum id, '$'||rownum name from dual connect by level <= 530;
Table created.
SQL> create index i_test on test(id);
Index created.
SQL>
SQL> begin

[code].....

why does approach with full scan take longer even if table occupies only one data block? PS. 11gR2

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I'm using Oracle 11g and I have a bunch of indexes and I want to check if they are being used. I just ran my workloads and now I want to see when each one was last used so I can see if it was during my timeframe or not.

After I ran my test, I found the below, but since I did not enable this, plus I have many indexes.

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Sep 5, 2012

I have a query that extracts the row with a max(record_date) within a group.

select ssn, fund, type_indicator, annuitant, cur_year, record_date, guarantee
from LC_MORTALITY
where (ssn, fund, type_indicator, annuitant, cur_year, record_date) in
(select ssn, fund, type_indicator, annuitant, cur_year, max(record_date)
from LC_MORTALITY
group by ssn, fund, type_indicator, annuitant, cur_year);

the table has index that matches the group by clause exactly.

create index IDX_LC_MORTALITY_sftayd on LC_MORTALITY
(SSN,
FUND,
TYPE_INDICATOR,
ANNUITANT,
cur_year,
record_date

However, the plan ignores the index

---------------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes |TempSpc| Cost (%CPU)| Time |
---------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1963K| 241M| | 1375K (4)| 05:21:04 |
|* 1 | HASH JOIN RIGHT SEMI| | 1963K| 241M| 9701M| 1375K (4)| 05:21:04 |
| 2 | VIEW | VW_NSO_1 | 145M| 8038M| | 241K (12)| 00:56:22 |
| 3 | HASH GROUP BY | | 145M| 8038M| | 241K (12)| 00:56:22 |
| 4 | TABLE ACCESS FULL| LC_MORTALITY | 145M| 8038M| | 219K (3)| 00:51:13 |
| 5 | TABLE ACCESS FULL | LC_MORTALITY | 145M| 9840M| | 222K (5)| 00:51:49 |
---------------------------------------------------------------------------------------------
[code]...

It uses the index but still shows "table access full" in one place. Why is there still a full access?Can I do anything to optimize further?

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Feb 10, 2012

Am pasting the sample code here, which i got from some site..

DECLARE
TYPE population_type IS TABLE OF NUMBER INDEX BY VARCHAR2(64);
country_population population_type;
continent_population population_type;
howmany NUMBER;

[code]...

Here we are fetching indexes (like Antartica/Australia) from these two statements continent_population.FIRST or continent_population.LAST. If there are three or more indexes in the same table, how to fetch all of them?

I have tried using this, but doesnt work because loop variables are by default integers:

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dbms_output.put_line('i:'||i);
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Feb 18, 2011

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Aug 8, 2011

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May 19, 2011

How can i turn this into functional index.

WHERE (IPC_DISP_ID IS NOT NULL AND DISP_EXIST > 0)
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AND ( (IPC_ITM_ID IS NOT NULL AND ITM_EXIST > 0) OR IPC_ITM_ID IS NULL )

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Jun 27, 2010

I have a very huge table. There are many indexes.My focus is on the following indexes:

APT_DEDUCTIBLE A_PT_ORDREGBUS_UNIT
APT_DEDUCTIBLE A_PT_ORDREGMD_CODE
APT_DEDUCTIBLE A_PT_ORDREGPT_CODE

[Code]...

My Question is, since this 3 indexes has two columns "Bus_unit and Md_code", which index can i delete. Will they effect on database performance, if i delete one of them?

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PL/SQL :: Index Not Being Used In Group By

Sep 14, 2012

Here is the scenario with examples. Big table 333 to 500 million rows in the table. Statistics are gathered. Histograms are there. Index is not being used though. Why?

  CREATE TABLE "XXFOCUS"."some_huge_data_table"
   (  "ORG_ID" NUMBER NOT NULL ENABLE,
  "PARTNERID" VARCHAR2(30) NOT NULL ENABLE,
  "EDI_END_DATE" DATE NOT NULL ENABLE,
  "CUSTOMER_ITEM_NUMBER" VARCHAR2(50) NOT NULL ENABLE,
  "STORE_NUMBER" VARCHAR2(10) NOT NULL ENABLE,
  "EDI_START_DATE" DATE,

[Code]...

Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.2.0 - 64bit Production With the Partitioning, OLAP, Data Mining and Real Application Testing options

SQL> SELECT num_rows FROM user_tables s WHERE s.table_name = 'some_huge_data_table';

  NUM_ROWS                                                                     
----------                                                                     
333338434                                                                     

SQL> SELECT MAX(edi_end_date)
  2    FROM some_huge_data_table p
  3   WHERE p.org_id = some_number
  4     AND p.partnerid = 'some_string';

MAX(EDI_E                                                                      
---------                                                                      
13-MAY-12                                                                      

Elapsed: 00:00:00.00

SQL> explain plan for

  2  SELECT MAX(edi_end_date)
  3    FROM some_huge_data_table p
  4   WHERE p.org_id = some_number
  5     AND p.partnerid = 'some_string';

Explained.

SQL> /

PLAN_TABLE_OUTPUT                                                                                  
----------------------------------------------------------------------------------------------------
Plan hash value: 2104157595                                                                                                                                                                           
--------------------------------------------------------------------------------------------       
| Id  | Operation                    | Name        | Rows  | Bytes | Cost (%CPU)| Time     |       
--------------------------------------------------------------------------------------------       
|   0 | SELECT STATEMENT             |             |     1 |    22 |     4   (0)| 00:00:01 |       
|   1 |  SORT AGGREGATE              |             |     1 |    22 |            |          |       
|   2 |   FIRST ROW                  |             |     1 |    22 |     4   (0)| 00:00:01 |       
|*  3 |    INDEX RANGE SCAN (MIN/MAX)| some_huge_data_table_PK |     1 |    22 |     4   (0)| 00:00:01 |       
--------------------------------------------------------------------------------------------       

SQL> explain plan for

  2  SELECT MAX(edi_end_date),
  3         org_id,
  4         partnerid
  5    FROM some_huge_data_table
  6   GROUP BY org_id,
  7            partnerid;

Explained.

PLAN_TABLE_OUTPUT                                                                                  
----------------------------------------------------------------------------------------------------
Plan hash value: 3950336305                                                                                                                                                                            
-------------------------------------------------------------------------------                    
| Id  | Operation          | Name     | Rows  | Bytes | Cost (%CPU)| Time     |                    
-------------------------------------------------------------------------------                    
|   0 | SELECT STATEMENT   |          |     2 |    44 |  1605K  (1)| 05:21:03 |                    
|   1 |  HASH GROUP BY     |          |     2 |    44 |  1605K  (1)| 05:21:03 |                    
|   2 |   TABLE ACCESS FULL| some_huge_data_table |   333M|  6993M|  1592K  (1)| 05:18:33 |                    
-------------------------------------------------------------------------------      

Why wouldn't it use the index in the group by? If I write a loop to query for different partnerid (there are only three), the whole things takes less than a second.

btw, I gave the index hint too. Didn't work. Version mentioned in the example.

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There is a very large fact table that is range partitioned by a column DATE_KEY of type NUMBER(38), such that every hour is a different partition. There is a bitmap index BX$FACT#DATE_KEY on field DATE_KEY, which also is a foreign key referencing DATE_DIM (DATE_KEY). There is a different DATE_KEY for every hour, generated as YYYYMMDDHH24.

When I run

"SELECT * FROM FACT WHERE DATE_KEY >= 2012031207 AND DATE_KEY < 2012031208"

to get all the records for 7 am on March 12th, partition pruning kicks in and sees that only one partition is used. The CBO then decides to do a full scan of the partition. This behavior is correct/desired.

If, however, I run

"SELECT * FROM FACT WHERE DATE_KEY = 2012031207 AND DATE_KEY < 2012031209"

to get all the records for 7 and 8 am, Oracle knows that it will have to scan two partitions. The CBO then decides that using the BX$FACT#DATE_KEY must be a good idea and, instead of doing a full scan of the partitions, does access by local index rowid, which is many times slower.

I think I understand the cause - when more than a single partition is involved, Oracle has to use the global index stats (instead of the local ones, like in the first scenario) and the CBO decides to use it because that the selectivity for the global index is great, when in fact the query will return all the rows for that particular partition (no selectivity).

How to get the CBO to choose a full scan in the second scenario as well? I need to support ad-hoc queries generated by a BI tool, so I cannot add hints to the queries. I also can't get rid of the index on DATE_KEY, because in real life the predicates are on fields of the date dimension, not directly on the key, so I need to join on it.

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Oct 20, 2012

I am using ORACLE 11gR1.

I was running a test on a huge table with a bitmap index on one of the columns. But bitmap index is not getting used. Below are the test details.

create table test (col1 number, col2 number);

begin
for i in 1..1000000
loop
if mod(i,2) = 0 then
insert into test values(i, 'Y');
else
insert into test values(i, 'N');
end if;
end loop;
end;
COMMIT;

The intention here is to have only two distinct values in the entire table. Based on these values I will not build BITMAP index on col2.

CREATE BITMAP INDEX BITMAP_TEST on TEST(col2) COMPUTE STATISTICS;

Now when I run the below query, it doesn't uses BITMAP index. Instead the explain plan shows a full table scan.

select * from test where col2 = 'Y';

Now when I force ORACLE to use index through hint, the cost is too high while using the bitmap index(probably why the ORACLE chose not to use the index at the first stage).

I have read somewhere, that BITMAP index is useful when we have more than 1 or 2 bitmap indexes on other columns of the same table as well And the query should be like

select * from table where col1 = 'Y' and sex = 'F';

In this case oracle will use BITMAP but not in the case where there is only one column that has BITMAP index.

Considering all the factors stated above, is there any way I can fine tune my original query?

select * from test where col2 = 'Y';

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