To force the index
HelloMy DB is 10.2.0.4
I have a HISTORY table that has 4 million documents.
I have a query which gives 15 lines out of it.
Index is exactly on the same columns as the where clause.
My = ALL_ROWS optimizer_mode
I had read "complete analyses are NOT ALWAYS evil, indexes are NOT ALWAYS good.
But is it possible to force the query to use the indexes here?
CREATE INDEX history_idx3
ON history (
ACCNR,
ACCERGNR,
CUSTNR
)
STORAGE (
INITIAL 241664 K
)
/
SQL> SELECT * FROM HISTORY
WHERE ACCNR = 1500003
AND ACCERGNR = 0
AND CUSTNR = 230530 2 3 4 ;
15 ROWS SELECTED.
ELAPSED: 00:03:41.00
EXECUTION PLAN
----------------------------------------------------------
PLAN HASH VALUE: 3565408272
------------------------------------------------------------------------------
| ID | OPERATION | NAME | ROWS | BYTES | COST (%CPU)| TIME |
------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | 200 | 93050 (2)| 00:18:37 |
|* 1 | TABLE ACCESS FULL| HISTORY | 1 | 200 | 93050 (2)| 00:18:37 |
------------------------------------------------------------------------------
PREDICATE INFORMATION (IDENTIFIED BY OPERATION ID):
---------------------------------------------------
1 - FILTER("CUSTNR"=230530 AND "ACCERGNR"=0 AND
TO_NUMBER("ACCNR")=1500003)
STATISTICS
----------------------------------------------------------
1 RECURSIVE CALLS
0 DB BLOCK GETS
420095 CONSISTENT GETS
418614 PHYSICAL READS
0 REDO SIZE
6266 BYTES SENT VIA SQL*NET TO CLIENT
492 BYTES RECEIVED VIA SQL*NET FROM CLIENT
2 SQL*NET ROUNDTRIPS TO/FROM CLIENT
0 SORTS (MEMORY)
0 SORTS (DISK)
15 ROWS PROCESSEDseems to be ACCNR in the table BACKGROUND is defined as VARCHAR?
If so, your index is ignored.
Try this:
SELECT * FROM HISTORY
WHERE ACCNR = '1500003'
AND ACCERGNR = 0
AND CUSTNR = 230530
Tags: Database
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Force the use of the index without advice
Dear all,
I'm a newbie in the world of oracle.
I HAD POSTED THIS SAME QUESTION IN SQL AND PLSQL CATEGORY, but thought that I had posted in a wrong category, so I post the same question again here.
Recently my boss asked me a question about the use of the index.
He wants to force the index to use if the optimizer chooses not to use it.
But limitattion is this boat reach the query or the code because it is taken directly by an application that we can not change the code.
So how is - a can force a query to use index without giving advice.
It should be for a particular query, it should not apply for all indexes in the database.
I know a parameter "OPTIMIZER_INDEX_COST_ADJ. If you set this parameter correctly, you can force the optimizer to use index. But it has its own limitations.
So I want an alternative to this option which can only be applied to a particular query that is run without the use of indicators.
Because this is my first thread, sorry if I made any mistake by posting the question
Thank you all in advance
Kind regards
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Have you tried the oracle outlines.
Concerning
Anurag -
TIP, GOLD and the INDEX FUNCTION-ORIENTED
RDBMS: 10.1.0.5.0
I'm trying to force an index based on a function in a query with a condition OR .
It seems that INDEX INDICATOR does not work if the query has an OR condition.
I created a test case to describe the problem:
The plan of the explain for a simple query command is:create table tab1 (col1 VARCHAR2(300)) ....load the table....... CREATE INDEX col1_IX ON tab1 ( my_FUNCTION(col1) ) TABLESPACE USERS ;
If the simple query has a CONDITION or:select * from tab1 where my_FUNCTION(col1) = '+23452081' Plan hash value: 2179519467 --------------------------------------------------------------------------------------- | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | --------------------------------------------------------------------------------------- | 0 | SELECT STATEMENT | | 871 | 512K| 2 (0)| 00:00:01 | | 1 | TABLE ACCESS BY INDEX ROWID| TAB1 | 871 | 512K| 2 (0)| 00:00:01 | |* 2 | INDEX RANGE SCAN | COL1_IX | 348 | | 1 (0)| 00:00:01 | --------------------------------------------------------------------------------------- Predicate Information (identified by operation id): --------------------------------------------------- 2 - access("my_FUNCTION"("COL1")='+23452081') Note ----- - dynamic sampling used for this statement
I tried to force the index using the trick without success:select * from tab1 where ( MY_FUNCTION(col1) = '+23452081' or col1 <> '') Plan hash value: 2211052296 -------------------------------------------------------------------------- | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | -------------------------------------------------------------------------- | 0 | SELECT STATEMENT | | 5183 | 3047K| 59 (31)| 00:00:01 | |* 1 | TABLE ACCESS FULL| TAB1 | 5183 | 3047K| 59 (31)| 00:00:01 | -------------------------------------------------------------------------- Predicate Information (identified by operation id): --------------------------------------------------- 1 - filter("COL1"<>'' OR "MY_FUNCTION"("COL1")='+23452081') Note ----- - dynamic sampling used for this statement
Can you help me?select /*+ index(tab1 col1_IX) */ * from tab1 where ( MY_FUNCTION(col1) = '+23452081' or col1 <> '') Plan hash value: 2211052296 -------------------------------------------------------------------------- | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | -------------------------------------------------------------------------- | 0 | SELECT STATEMENT | | 5183 | 3047K| 59 (31)| 00:00:01 | |* 1 | TABLE ACCESS FULL| TAB1 | 5183 | 3047K| 59 (31)| 00:00:01 | -------------------------------------------------------------------------- Predicate Information (identified by operation id): --------------------------------------------------- 1 - filter("COL1"<>'' OR "MY_FUNCTION"("COL1")='+23452081') Note ----- - dynamic sampling used for this statementPublished by: Dom Brooks on January 28, 2011 11:26
Sorry too hasty.
If you have an index on COL1 and your predicate can use this index, then you might get a BITMAP CONVERSION.
If you do not have an index on COL1 or you cannot use it, then you will do a FTS.
Useful relevant info:
Based on an index function are not used in the expansion of GOLD in 10gR 1 (or beyond - restriction still documented in 11 GR 2)
See here:
http://download.Oracle.com/docs/CD/B14117_01/AppDev.101/b10795/adfns_in.htm#1006464Dion Cho spoke here:
http://dioncho.WordPress.com/2009/07/31/function-based-index-and-or-expansion/ -
Query is not using the index. (Included execution plan. TKPROF output not available)
Hi all
Version of DB: Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Prod
Here is the description of the problem:
(The statistics are up to date for all tables).
The query below does not use the index on ACCOUNTS_LIVE (ID). (Unique index)
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Please suggest.
Thanks in advance,
JacWhat happens when you force the index by using hint and use the hash between txn and acc join?
See you soon
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Hello
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SQL> select banner from v$version; BANNER ---------------------------------------------------------------------------- Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 - 64bit Production PL/SQL Release 12.1.0.2.0 - Production CORE 12.1.0.2.0 Production TNS for Linux: Version 12.1.0.2.0 - Production NLSRTL Version 12.1.0.2.0 - Production SQL> show parameter remote_dependencies NAME TYPE VALUE ------------------------------------ ----------- ---------- remote_dependencies_mode string TIMESTAMP SQL> show parameter query_rewrite NAME TYPE VALUE ------------------------------------ ----------- ------------- query_rewrite_enabled string TRUE query_rewrite_integrity string enforced
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The index depends on the State of the PL/SQL function. The index can be
struck down or rendered useless by changes to the function. The index is marked
People with DISABILITIES, if he is brought to the function or function is re-created.
The timestamp of the function is used to validate the index.
To allow the index after it is created, the function if the signature of the
the function is identical to the front:
ALTER INDEX ENABLE;
If the signature of functions is changed, to make the changes effective
in the index, the index must be renewed to make it valid.
ALTER INDEX REBUILD.
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SQL> CREATE OR REPLACE FUNCTION f1 (p_string IN VARCHAR2) 2 RETURN VARCHAR2 3 DETERMINISTIC 4 IS 5 BEGIN 6 RETURN UPPER(p_string); 7 END f1; 8 / Function created. SQL> SELECT index_name, index_type, status, funcidx_status 2 FROM user_indexes; INDEX_NAME INDEX_TYPE STATUS FUNCIDX_ ---------- --------------------------- -------- -------- X1_TMP_T1 FUNCTION-BASED NORMAL VALID ENABLED
Should not be. Because of the function "create or replace" F1 never go through a "invalid" phase which may be necessary for index becomes unusable? What about queries on the TMP_T1 table? Does optimizer always uses access index or not? What about the results?
SQL> EXPLAIN PLAN SET statement_id='s1' FOR 2 SELECT a_string, f1(a_string) as f1_a_string, f1('a') as f1_literal 3 FROM tmp_t1 4 WHERE f1(a_string) = 'a'; Explained. SQL> SELECT * from table(dbms_xplan.display(statement_id=>'s1')); PLAN_TABLE_OUTPUT ------------------------------------------------------------------------------------------------------------------------ Plan hash value: 3133804460 ------------------------------------------------------------------------------------------------- | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | ------------------------------------------------------------------------------------------------- | 0 | SELECT STATEMENT | | 1 | 2024 | 2 (0)| 00:00:01 | | 1 | TABLE ACCESS BY INDEX ROWID BATCHED| TMP_T1 | 1 | 2024 | 2 (0)| 00:00:01 | |* 2 | INDEX RANGE SCAN | X1_TMP_T1 | 1 | | 1 (0)| 00:00:01 | -------------------------------------------------------------------------------------------------The index is used by the optimizer, see the results.
SQL> column f1_a_string format a15; SQL> column f1_literal format a15; SQL> SELECT a_string, f1(a_string) as f1_a_string, f1('a') as f1_literal 2 FROM tmp_t1 3 WHERE f1(a_string) = 'a'; A_STRING F1_A_STRING F1_LITERAL ---------- --------------- --------------- a a AA_STRING = value in the table
F1_A_STRING = value of f1 (a_string) but the value is not evaluated because it comes from an index, so tiny value (remember, at the time index created the function returned small values)
F1_LITERAL = value of the function f1 newly evaluated, using literal instead of the value in the table.
Predicate f1 (a_string) = 'a' should return no rows because no character uppercase is equivalent to "a". Query with f1 (a_string) = 'A' should return a line, but it doesn't.
SQL> SELECT a_string, f1(a_string) as f1_a_string, f1('a') as f1_literal 2 FROM tmp_t1 3 WHERE f1(a_string) = 'A'; no rows selectedAnyone know if this is an expected behavior? And, is it possible to disable the index based on a function whenever the underlying function signature is changed? The parameter query_rewrite_integrity = applied from
DOC-ID 66277.1 does not seem to do the trick:
(c) session variables
~~~~~~~~~~~~~~~~~~~~
QUERY_REWRITE_ENABLED (true, false),
QUERY_REWRITE_INTEGRITY (confidence, forced, stale_tolerated)
determines the optimizer to use index based on a function with
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TRUST: Oracle allows rewrites using relationships that have
was declared.
APPLIED: Oracle ensures and guarantees consistency and integrity.
STALE_TOLERATED: Oracle allows rewrites using vessels of the relationship not applied.
Used in the case of materialized views.
Set session variable cost function optimizer to choose the
a function-based index
Kind regards
SAMO
From the Manual 11.2 ( https://docs.oracle.com/cd/E11882_01/appdev.112/e41502/adfns_indexes.htm#ADFNS254 )
"If you change the semantics of a
DETERMINISTICrun and recompile, then you must manually rebuild all addicts depending on index and materialized views." Otherwise, they report results for the previous version of the function. »This note is not that I made my initial comment well - which was based on an incorrect memory the relationship between function-oriented and autonomous pl/sql functions, so I won't try to explain it. In fact, I went back to Oracle 8i practice to see if something had changed between yesterday and today and found that I had described exactly the behavior that the OP has been seeing. It's the way it is supposed to be.
Concerning
Jonathan Lewis
-
Bad alphabetically in the index
Dear community,
I use ID CS6.
I have discovered a reproducible error, given the order of the names in the index sheets.
When I put marks index to names
- Anton huh
- Martin huh
- Johannes Heindl
in this way they will be sorted:
- Huh, Anton
- Heindl, Johannes
- Huh, Martin
which is obviously incorrect. The order should rather be 1,3,2.
I think the problem is that the spaces between the first and last name are ignored:
The names "Smith, John" is treated as "Smithjohn".
Corsica, I can force ID to sort correctly by using the "sort by"-field. But why is that need?
Names are generally classified by NAME and if they are the same, you look on the first NAME. Word by word instead of the letter by letter.
Are there really no feature that provides "the word of the order of the words" without interfering manually?
Thank you in advance!
I have the honour, of course, you put these scripts to use, but they serve a particular purpose and they mess around with the document considerably. Because everything what needs index of martin is setting/updating the fields from the sort order, it is easier to target the index panel immediately: it is faster and safer.
You are partially right that remove the space after that a comma sorts the sorting problem, but using the sign $ is delicate because you might want to do things later, and symbols that have a special meaning in regular expressions are to be avoided if possible, just to make life easier. So, I use the number 5 instead. The advantage is that I can use different numbers to refine the sort order. Here's the script:
(function () { if (app.documents[0].indexes.length > 0) { var order; var topics = app.documents[0].indexes[0].allTopics; for (var i = topics.length-1; i >= 0; i--) { order = topics[i].sortOrder; // If the topic already has a sort order defined, change it if (order !== '' && order.indexOf(', ') > -1) { topics[i].sortOrder = order.replace (', ', ',5'); // Otherwise use the topic's name } else if (topics[i].name.indexOf(', ') > -1) { topics[i].sortOrder = topics[i].name.replace (', ', ',5'); } } } }());Peter
-
I have problem with a query as follows. It does not index when I keep a function on the left side of the comparison in which the condition.
But when I remove the function is using the index.
With BLC AS Name Null? Type ----------------------------------------- -------- ---------------------------- ID NOT NULL NUMBER MASTER_VALUE NOT NULL NUMBER(8) DESC_TEXT_ID NUMBER GVM VARCHAR2(50) MASTER_LOOKUP_ID NOT NULL NUMBER WORK_SECTION_ID NUMBER AUDIT_TRAIL_NO NUMBER SQL> SELECT COUNT(*) FROM BLC; COUNT(*) ---------- 7769 SQL> SELECT COUNT(DISTINCT(GVM)) "distinct" FROM BLC; distinct ---------- 1350 SQL> SELECT COUNT(*) "nulls" FROM BLC WHERE GVM IS NULL; nulls ---------- 6419 SQL> SELECT COLUMN_NAME,INDEX_NAME FROM DBA_IND_COLUMNS WHERE TABLE_NAME='BLC'; COLUMN_NAME INDEX_NAME ---------------------------------------- ------------------------------ MASTER_LOOKUP_ID LKPCDE_MSTLKP_FK_I WORK_SECTION_ID LKPCDE_WRKSEC_FK_I GVM LKPCDE_UK MASTER_VALUE LKPCDE_MASTERID_VALUE_UK MASTER_LOOKUP_ID LKPCDE_MASTERID_VALUE_UK ID LKPCDE_PK SQL> EXPLAIN PLAN FOR SELECT ID FROM BLC WHERE UPPER ( GVM) = 'MAIN_ORG'; Explained. SQL> SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY); PLAN_TABLE_OUTPUT -------------------------------------------------------------------------------- Plan hash value: 3196655606 -------------------------------------------------------------------------------------- | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time| -------------------------------------------------------------------------------------- PLAN_TABLE_OUTPUT -------------------------------------------------------------------------------- | 0 | SELECT STATEMENT | | 78 | 624 | 18 (0)| 00:00:01 | |* 1 | TABLE ACCESS FULL| BLC | 78 | 624 | 18 (0)| 00:00:01 | -------------------------------------------------------------------------------------- Predicate Information (identified by operation id): PLAN_TABLE_OUTPUT ----------------------------------------------------------------------------------------------------------------------------------- 1 - filter(UPPER("GVM")='MAIN_ORG') 13 rows selected. SQL> EXPLAIN PLAN FOR SELECT ID FROM BLC WHERE GVM = 'MAIN_ORG'; Explained. SQL> SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY); PLAN_TABLE_OUTPUT -------------------------------------------------------------------------------- Plan hash value: 1620245961 -------------------------------------------------------------------------------- ---------------- | Id | Operation | Name | Rows | Bytes | Cost (% CPU)| Time | -------------------------------------------------------------------------------- ---------------- PLAN_TABLE_OUTPUT -------------------------------------------------------------------------------- | 0 | SELECT STATEMENT | | 1 | 8 | 2 (0)| 00:00:01 | | 1 | TABLE ACCESS BY INDEX ROWID| BLC | 1 | 8 | 2 (0)| 00:00:01 | |* 2 | INDEX UNIQUE SCAN | LKPCDE_UK | 1 | | 1 (0)| 00:00:01 | -------------------------------------------------------------------------------- ---------------- PLAN_TABLE_OUTPUT -------------------------------------------------------------------------------- Predicate Information (identified by operation id): --------------------------------------------------- 2 - access("GVM"='MAIN_ORG') 14 rows selected. SQL> EXPLAIN PLAN FOR SELECT /* INDEX(LKPCDE_UK) */ ID FROM BLC WHE RE UPPER ( GVM ) = 'MAIN_ORG'; Explained. SQL> SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY); PLAN_TABLE_OUTPUT -------------------------------------------------------------------------------- Plan hash value: 3196655606 -------------------------------------------------------------------------------- ------ | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | -------------------------------------------------------------------------------- ------ PLAN_TABLE_OUTPUT -------------------------------------------------------------------------------- | 0 | SELECT STATEMENT | | 78 | 624 | 18 (0)| 00:0 0:01 | |* 1 | TABLE ACCESS FULL| BLC | 78 | 624 | 18 (0)| 00:0 0:01 | -------------------------------------------------------------------------------- ------ Predicate Information (identified by operation id): PLAN_TABLE_OUTPUT -------------------------------------------------------------------------------- --------------------------------------------------- 1 - filter(UPPER("GVM")='MAIN_ORG') 13 rows selected.Please let me know how I can force it to use an index as it is causing the CPU usage.
I can't change the query in the application it is used in several places.
Thank you
And/or read: ORACLE-BASE - Oracle function index
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