Global Hints in oracle

Hi all,
Can any one please tell me what is Global Hints in oracle.
i know normal hints usage.
what is difference between normal hints and global hints.
Thanks in Advance,
Sanjeev.

http://download.oracle.com/docs/cd/E11882_01/server.112/e16638/hintsref.htm#PFGRF50104

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GLOBAL HINTS

Hi Oracle Experts
This is regarding GLOBAL HINTS
I have a situation where all my views are defined in the views schema say "my_view". And all my fact tables are created in another schema say "my_fact". They are all in the same database.
so schema1 = my_view and schema2 = my_fact
There are views v1, v2 and tables t1, t2
Now there arises a situation where I have a select query that retrives records through a view. This query is taking a very long time to execute. I am planning to use GLOBAL HINTS for PARALLEL
What I require is in the Select statement when using the PARALLEL hint should i specify the schema name in the hint
eg
/*+ PARALLEL (my_view.v1.my_fact.t1, 4)*/ or should it be
/*+ PARALLEL (v1.t1,4)*/
Please let me know which one to use.
Thanks in advance

Off the top of my head, I can't tell you what the correct syntax is. To be able to give you the correct answer I would have to read the manuals and experiment with the syntax until I see the PQ kick in. In other words, RTFM, test and if it still doesn't work, then get back to us.
Andre

Global Variable in Oracle Forms 6i

Hi,
How & where to define global variable in Oracle form 6i and also let me know how to access it.
Thanks in advance
Regards,
Sanket

hi
Global variable are forms specifice variable.
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Can we use hints in oracle 11g version ?

can we use hints in oracle 11g version ? is it working ??

Why do you ask these questions? Have you looked at the SQL Reference Guide and Performance Tuning Guide for your Oracle version - both which covers using hints?
Have you see a statement that is not supported? Or does not work?
Or are you simply doing idle speculation and expecting forum members to spend their free time in answering a basic question where the answer is ridiculously simply to find?

Append hint + ADO + Oracle OleDB Provider

Hi everybody!
This is my first post here in this great forum! ;-)
I have a problem using Append hint with Oracle OleDB Provider and I've been searching internet for an answer without any luck.
I'm trying to use Append hint with ADO + Oracle OleDB Provider (OraOLEDB.Oracle.1), like in the SQL below:
INSERT /*+APPEND*/
INTO my_table(field1, field2, field3)
SELECT 0 field1, v.field2, v.field3)
FROM my_second_table v
The problem: Oracle is still creting log for this INSERT (It is working like there was no Append hint).
If I use the same SQL statement with Microsoft Ole DB Provider for Oracle, the Append hint works as expected (log is not created), but doesn't work at all with Oracle DB Provider.
Trace shows me that the SQL sentence is ok (the append hint is there!).
I've tried Oracle servers 9.2 and/or 10g, and the problem is the same.
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Any help will be much appreciated!
Thanks in advance.
Alexandre Machado

user8010279 wrote:
Hi Solomon, thanks for you answer.
Is the same SQL against the same database, with the same program, using ADO + OleDB Provider.
The table is in NOLOGGING mode.
When I use Microsoft OleDB Provider for Oracle there is no log creation. Then I disconnect and reconnect to the same server/database, using Oracle OleDB Provider. Then I execute the same SQL and.... there IS log creation, meaning that in that scenario, append hint is being ignored. I can't figure out WHY!!! :-(
Alexandre,
I'm not sure what you mean by "there is log creation". In general you need to distinguish between UNDO and REDO generation. A direct-path insert (APPEND hint) doesn't generate undo but still can generate redo, depending on the ARCHIVELOG / FORCE LOGGING mode of the tablespace resp. database and the LOGGING/NOLOGGING attribute of the table.
Note that in case indexes exist on the table there will always be undo and therefore redo generation for the index maintenance as part of the direct-path insert.
You should check V$SESSION (SQL_ID in 10g, SQL_ADDRESS + SQL_HASH_VALUE in pre-10g) and V$SQL in the database to double check if the SQL passed by the Oracle OLEDB Provider actually contains the APPEND hint in case the INSERT actually generates UNDO (which is the indicator that shows you if the direct-path insert is used or not). Whether it generates REDO is - as already mentioned - depending on other factors.
So the question is how have you determined if the direct-path insert mode has been used or not?
The simplest approach to test if direct-path insert mode is used or not is to issue a query on the object inserted into after the insert before committing the transaction. If it fails with "ORA-12838: cannot read/modify an object after modifying it in parallel" then you successfully inserted using direct-path insert.
Note that there a number of restrictions that prevent the direct-path insert from happening, in those cases the APPEND hint will be silently ignored, e.g. enabled triggers, foreign keys on the table. A quite comprehensive list of restrictions is listed in the manuals here:
http://download.oracle.com/docs/cd/B28359_01/server.111/b28313/usingpe.htm#CACEJACE
Regards,
Randolf
Oracle related stuff blog:
http://oracle-randolf.blogspot.com/
SQLTools++ for Oracle (Open source Oracle GUI for Windows):
http://www.sqltools-plusplus.org:7676/
http://sourceforge.net/projects/sqlt-pp/

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I have a problem with the RESULT_CACHE hint , this has been used in the various function in our database e.g
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DATABASE Details are :
Oracle 11g Enterprise edition 11.1.0.7.0- 64 bit
HPUX version 11.1.0.7.0

Su**** wrote:
Yes Tubby you are correct,
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Best regards,
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SQL query performance difference with Index Hint in Oracle 10g

Hi,
I was having a problem in SQL select query which was taking around 20 seconds to get the results. So, by hit and trail method I added Index Oracle Hint into the same query with the list of indexes of the tables and the results are retrieved with in 10 milli seconds. I am not sure to get How this is working with Indexes Hint.
The query with out Index Hint:
select /*+rule*/ FdnTab2.fdn, paramTab3.attr_name from fdnmappingtable FdnTab, fdnmappingtable FdnTab2, parametertable paramTab1 ,parametertable paramTab3 where FdnTab.id=52787 and paramTab1.id= FdnTab.id and paramTab3.id = FdnTab.id and paramTab3.attr_value = FdnTab2.fdn and paramTab1.attr_name='harqUsersMax' and paramTab1.attr_value <> 'DEFAULT' and exists ( select ParamTab2.attr_name from parametertable ParamTab2, templaterelationtable TemplateTab2 where TemplateTab2.id=FdnTab.id and ParamTab2.id=TemplateTab2.template_id and ParamTab2.id=FdnTab2.id and ParamTab2.attr_name=paramTab1.attr_name) ==> EXECUTION TIME: 20 secs
The same query with Index Hint:
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Can any one suggest what could be the real problem?
Regards,
Purushotham

Sorry,
The right query and the explain plan:
select /*+rule*/ FdnTab2.fdn, paramTab3.attr_name from fdnmappingtable FdnTab, fdnmappingtable FdnTab2, parametertable paramTab1 ,parametertable paramTab3 where FdnTab.id=52787 and paramTab1.id= FdnTab.id and paramTab3.id = FdnTab.id and paramTab3.attr_value = FdnTab2.fdn and paramTab1.attr_name='harqUsersMax' and paramTab1.attr_value <> 'DEFAULT' and exists ( select ParamTab2.attr_name from parametertable ParamTab2, templaterelationtable TemplateTab2 where TemplateTab2.id=FdnTab.id and ParamTab2.id=TemplateTab2.template_id and ParamTab2.id=FdnTab2.id and ParamTab2.attr_name=paramTab1.attr_name)
SQL> @$ORACLE_HOME/rdbms/admin/utlxpls.sql
PLAN_TABLE_OUTPUT
Plan hash value: 651267974
| Id | Operation | Name |
| 0 | SELECT STATEMENT | |
|* 1 | FILTER | |
| 2 | NESTED LOOPS | |
| 3 | NESTED LOOPS | |
| 4 | NESTED LOOPS | |
|* 5 | INDEX UNIQUE SCAN | PRIMARY_KY_FDNMAPPINGTABLE |
PLAN_TABLE_OUTPUT
|* 6 | TABLE ACCESS BY INDEX ROWID| PARAMETERTABLE |
|* 7 | INDEX UNIQUE SCAN | PRIMARY_KY_PARAMETERTABLE |
| 8 | TABLE ACCESS BY INDEX ROWID | PARAMETERTABLE |
|* 9 | INDEX RANGE SCAN | PRIMARY_KY_PARAMETERTABLE |
| 10 | TABLE ACCESS BY INDEX ROWID | FDNMAPPINGTABLE |
|* 11 | INDEX UNIQUE SCAN | SYS_C005695 |
| 12 | NESTED LOOPS | |
|* 13 | INDEX UNIQUE SCAN | PRIMARY_KY_PARAMETERTABLE |
|* 14 | INDEX UNIQUE SCAN | PRIMARY_KEY_TRTABLE |
PLAN_TABLE_OUTPUT
Predicate Information (identified by operation id):
1 - filter( EXISTS (SELECT 0 FROM "TEMPLATERELATIONTABLE"
"TEMPLATETAB2","PARAMETERTABLE" "PARAMTAB2" WHERE
"PARAMTAB2"."ATTR_NAME"=:B1 AND "PARAMTAB2"."ID"=:B2 AND
"PARAMTAB2"."ID"="TEMPLATETAB2"."TEMPLATE_ID" AND
"TEMPLATETAB2"."ID"=:B3))
5 - access("FDNTAB"."ID"=52787)
6 - filter("PARAMTAB1"."ATTR_VALUE"<>'DEFAULT')
7 - access("PARAMTAB1"."ID"="FDNTAB"."ID" AND
PLAN_TABLE_OUTPUT
"PARAMTAB1"."ATTR_NAME"='harqUsersMax')
9 - access("PARAMTAB3"."ID"="FDNTAB"."ID")
11 - access("PARAMTAB3"."ATTR_VALUE"="FDNTAB2"."FDN")
13 - access("PARAMTAB2"."ID"=:B1 AND "PARAMTAB2"."ATTR_NAME"=:B2)
14 - access("TEMPLATETAB2"."ID"=:B1 AND
"PARAMTAB2"."ID"="TEMPLATETAB2"."TEMPLATE_ID")
Note
- rule based optimizer used (consider using cbo)
43 rows selected.
WITH INDEX HINT:
select /*+INDEX(fdnmappingtable[PRIMARY_KY_FDNMAPPINGTABLE],parametertable[PRIMARY_KY_PARAMETERTABLE])*/ FdnTab2.fdn, paramTab3.attr_name from fdnmappingtable FdnTab, fdnmappingtable FdnTab2, parametertable paramTab1 ,parametertable paramTab3 where FdnTab.id=52787 and paramTab1.id= FdnTab.id and paramTab3.id = FdnTab.id and paramTab3.attr_value = FdnTab2.fdn and paramTab1.attr_name='harqUsersMax' and paramTab1.attr_value <> 'DEFAULT' and exists ( select ParamTab2.attr_name from parametertable ParamTab2, templaterelationtable TemplateTab2 where TemplateTab2.id=FdnTab.id and ParamTab2.id=TemplateTab2.template_id and ParamTab2.id=FdnTab2.id and ParamTab2.attr_name=paramTab1.attr_name);
SQL> @$ORACLE_HOME/rdbms/admin/utlxpls.sql
PLAN_TABLE_OUTPUT
Plan hash value: 2924316070
| Id | Operation | Name | Rows | B
ytes | Cost (%CPU)| Time |
PLAN_TABLE_OUTPUT
| 0 | SELECT STATEMENT | | 1 |
916 | 6 (0)| 00:00:01 |
|* 1 | FILTER | | |
| | |
| 2 | NESTED LOOPS | | 1 |
916 | 4 (0)| 00:00:01 |
| 3 | NESTED LOOPS | | 1 |
401 | 3 (0)| 00:00:01 |
PLAN_TABLE_OUTPUT
| 4 | NESTED LOOPS | | 1 |
207 | 2 (0)| 00:00:01 |
|* 5 | TABLE ACCESS BY INDEX ROWID| PARAMETERTABLE | 1 |
194 | 1 (0)| 00:00:01 |
|* 6 | INDEX UNIQUE SCAN | PRIMARY_KY_PARAMETERTABLE | 1 |
| 1 (0)| 00:00:01 |
|* 7 | INDEX UNIQUE SCAN | PRIMARY_KY_FDNMAPPINGTABLE | 1 |
PLAN_TABLE_OUTPUT
13 | 1 (0)| 00:00:01 |
| 8 | TABLE ACCESS BY INDEX ROWID | PARAMETERTABLE | 1 |
194 | 1 (0)| 00:00:01 |
|* 9 | INDEX RANGE SCAN | PRIMARY_KY_PARAMETERTABLE | 1 |
| 1 (0)| 00:00:01 |
| 10 | TABLE ACCESS BY INDEX ROWID | FDNMAPPINGTABLE | 1 |
515 | 1 (0)| 00:00:01 |
PLAN_TABLE_OUTPUT
|* 11 | INDEX UNIQUE SCAN | SYS_C005695 | 1 |
| 1 (0)| 00:00:01 |
| 12 | NESTED LOOPS | | 1 |
91 | 2 (0)| 00:00:01 |
|* 13 | INDEX UNIQUE SCAN | PRIMARY_KEY_TRTABLE | 1 |
26 | 1 (0)| 00:00:01 |
|* 14 | INDEX UNIQUE SCAN | PRIMARY_KY_PARAMETERTABLE | 1 |
65 | 1 (0)| 00:00:01 |
PLAN_TABLE_OUTPUT
Predicate Information (identified by operation id):
1 - filter( EXISTS (SELECT /*+ */ 0 FROM "TEMPLATERELATIONTABLE" "TEMPLATETAB
2","PARAMETERTABLE"
PLAN_TABLE_OUTPUT
"PARAMTAB2" WHERE "PARAMTAB2"."ATTR_NAME"=:B1 AND "PARAMTAB2"."ID"
=:B2 AND
"TEMPLATETAB2"."TEMPLATE_ID"=:B3 AND "TEMPLATETAB2"."ID"=:B4))
5 - filter("PARAMTAB1"."ATTR_VALUE"<>'DEFAULT')
6 - access("PARAMTAB1"."ID"=52787 AND "PARAMTAB1"."ATTR_NAME"='harqUsersMax')
7 - access("FDNTAB"."ID"=52787)
9 - access("PARAMTAB3"."ID"=52787)
11 - access("PARAMTAB3"."ATTR_VALUE"="FDNTAB2"."FDN")
13 - access("TEMPLATETAB2"."ID"=:B1 AND "TEMPLATETAB2"."TEMPLATE_ID"=:B2)
14 - access("PARAMTAB2"."ID"=:B1 AND "PARAMTAB2"."ATTR_NAME"=:B2)
PLAN_TABLE_OUTPUT
Note
- dynamic sampling used for this statement
39 rows selected.

FIRST ROWS OPTIMIZER HINT IN ORACLE

Hello All,
Version : Oracle9i Enterprise Edition Release 9.2.0.5.0 - 64bit Production
Can we use First Rows hint quick response time for application programming.
The java result set waits for query completion to achieve the complete result set.
Weird though to raise in a DB forum but i Guess most application might have used this and most of you would have come across this issue in application front.
Thanks
Vijay G

Exactly the same query should, more or less, perform exactly the same (except when statistics and optimizer parameters vary !), but adjusting for client / network latency overheads.
Are you sure that your Java program is actually submitting exactly the same SELECT statement to the Oracle server as your sqlplus or TOAD session is ? (btw, TOAD shows only the first 'n' rows).
Another question : Why do you have a PARALLEL Hint there ? That would make sense for a FullTableScan -- but your requirement should NOT be for a FullTableScan.
Your ORDER BY clause will not guarantee that the 21st row -- ie the 3rd page -- is different from the 20th row -- the last row on the second page.
See Tom Kyte's notes again.
http://www.oracle.com/technology/oramag/oracle/06-sep/o56asktom.html
Hemant K Chitale
http://hemantoracledba.blogspot.com

Append Hint in Oracle

Hi All,
Any thoughts on why we get redo generated during a Insert operation with /*+ APPEND */ hint when having the DB in archive log mode. And same statement generating very very less redo when the DB is in no archive log mode. Is the redo generation mandatory in ARCHIVE LOG MODE, if so how can we achieve a direct path insert in DB in archivelog mode.
DB: 11.2.0
OS: Windows XP.
STMT:
DB in Archive log Mode.
SQL> insert /*+ append */ into test
2 select object_id from x;
71708 rows created.
Statistics
217 recursive calls
146 db block gets
228 consistent gets
0 physical reads
*907948 redo size*
665 bytes sent via SQL*Net to client
623 bytes received via SQL*Net from client
3 SQL*Net roundtrips to/from client
7 sorts (memory)
0 sorts (disk)
71708 rows processed
DB in No-Archive Log Mode
SQL> insert /*+ append */ into test
2 select object_id from x;
71708 rows created.
Statistics
33 recursive calls
149 db block gets
125 consistent gets
0 physical reads
*3152 redo size*
662 bytes sent via SQL*Net to client
623 bytes received via SQL*Net from client
3 SQL*Net roundtrips to/from client
1 sorts (memory)
0 sorts (disk)
71708 rows processed
Any help would be greatly appreciated.
Thanks in Advance.
Edited by: user8710159 on Jul 11, 2011 12:40 PM

from http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:5280714813869
It is even more deep then that. For example:
Table Mode Insert Mode ArchiveLog mode result
LOGGING APPEND ARCHIVE LOG redo generated
NOLOGGING APPEND ARCHIVE LOG no redo
LOGGING no append "" redo generated
NOLOGGING no append "" redo generated
LOGGING APPEND noarchive log mode no redo
NOLOGGING APPEND noarchive log mode no redo
LOGGING no append noarchive log mode redo generated
NOLOGGING no append noarchive log mode redo generated
Iordan Iotzov
http://iiotzov.wordpress.com/

Hash_sj hint in oracle 10g

Please let me know how hash_sj hint is used to improve performance in sql query using EXISTS in oracle 10g? What is the use of hash_sj hint? How it improves the performance?

Hi Nicosa,
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Global Hints in oracle

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