Oracle SQL Tuning
Hi,
Can somebody explain me about the basics of tuning or any good resource online for absolute beginners.
Concepts of Explain Plan, Hints, indexes etc...
I ve come across some terminolgy like,
Driving table,
The order of the table in the from clause
The order of the joins in the where clause.
When and where to use hints.
which one is a candidate for an hint
Explain plan explained, like nested loops, hash join, merge, etc,,, with some examples on how it works...
How to judge on the costs section of the explain plan...
Any help is appreciated...
Thanks!
That's a very broad question. I've always found the online Oracle documentation to be the best available answer to most questions and doubts that I come across.
Regarding your particular doubts, I'd say you should take a look at the concepts book, the SQL reference and maybe the Performance Tuning guide for info on explain plans and the sort.
Concepts - http://download.oracle.com/docs/cd/E11882_01/server.112/e10713.pdf
SQL - http://download.oracle.com/docs/cd/E11882_01/server.112/e10592.pdf
Performance Tuning - http://download.oracle.com/docs/cd/E11882_01/server.112/e10821.pdf
The developer book may also be very useful as well as the PL/SQL reference. Just take a look at below for the complete list of books:
http://www.oracle.com/pls/db112/portal.portal_db?selected=4&frame=#essentials
It will take you a lot of effort and patience to go through those but it certainly pays off.
Similar Messages
-
All,
I am new in SQL Tuning. Can anyone suggests any good book / pdfs / links to start the work in tuning.
Regards
NDBesides the documentation that BluShadow provided I would suggest the following books:
Cost-Based Oracle Fundamentals (ISBN-13 978-1590596364)
Troubleshooting Oracle Performance (ISBN-13 978-1590599174)
Optimizing Oracle Performance (ISBN-13 978-0596005276)
Expert Oracle Database Architecture (ISBN-13 978-1590595305) -
Hi,
I would like to know any SQL tuning methods specific to Oracle exadata so that they could improve the performance of the database?
I am aware that oracle exadata runs with Oracle 11g, but i would like to know wheather there is any tuning scope w.r.t to SQL's on exadata?
regards
sunilWell there are some things that are very different about Exadata. All the standard Oracle SQL tuning you have learned already should not be forgotten as Exadata is running standard 11g database code, but there are many optimizations that have been added that you should be aware of. At a high level, if you are doing OLTP type work you should be trying to make sure that you take advantage of Exadata Smart Flash Cache which will significantly speed up your small I/O's. But long running queries are where the big benefits show up. The high level tuning approach for them is as follows:
1. Check to see if you are getting Smart Scans.
2. If you aren't, fix what ever is preventing them from being used.
We've been involved in somewhere between 25-30 DB Machine installations now and in many cases, a little bit of effort changes performance dramatically. If you are only getting 2 to 3X improvement over your previous platform on these long running queries you are probably not getting the full benefit of the Exadata optimizations. So the first step is learning how to determine if you are getting Smart Scans or not and on what portions of the statement. Wait events, session statistics, V$SQL, SQL Monitoring are all viable tools that can show you that information. -
We have activated the Oracle 'SQL Tuning pack' however only one function "SQL Tuning Advisor" is activated/visible in ST04
and other functionality is not visible. We have already taken license of 'SQL Tuning pack' .
Other then this we want to use following oracle supported features.
1) Automatic SQL Tuning Advisor
2) Real-time SQL Monitoring
3) Object Reorganization Wizard
As I know we can use "oracle enterprise manager" to use such oracle features, If SAP allow use of OEM in SAP environment.
can someone help here please..?
Thanks,
Kapil PandeyHello Kapil,
which other options did you expect to find in ST04? SAP note 1028068 speaks only of the "SQL Tuning Advisor" which will be activated:
As of Enhancement Package 1 for Basis Release 7.00 (that is, Basis Release 7.01), the function "SQL Tuning Advisor" is contained in the DBA Cockpit. This optional function requires the Oracle Tuning Pack to be licensed.
The other features should be used via the OEM, because they are not integrated in the DBACOCKPIT transaction:
- Automatic SQL Tuning Advisor
- Real-time SQL Monitoring (with OEM you even get a really useful visualization)
- Object Reorganization Wizard -> better use brspace because it is supported by SAP
Regards,
Mark -
hello everyone i am an oracle developer working in oracle Forms and reports i have a keen interest in this database and would like to become a DBA.. pls suggest me some good books which can teach me about the whole oracle architecture and the other details.
Apart from that i want to study Sql tuning too for oracle 10g database.. please suggest me some good books regarding both these two topics.Hi,
Apart from that i want to study Sql tuning too for oracle 10g database.. please suggest me some good books regarding both these two topics.Apart from Oracle Documentation, there are many good references available in the market, go through the review and check the table of contents before deciding which book(s) you want to go with.
Oracle 10g DBA
http://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Daps&field-keywords=Oracle+10g+DBA
Oracle SQL Tuning
http://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Daps&field-keywords=Oracle+SQL+Tuning
Regards,
Hussein -
Hello Gurus,
We have 10.2.04 RAC database running in production.The application does lot of DML.I need to tune query regularly.
Could anybody sugggest a good book for Oracle SQl tuning.
Thanks and Regards,
jitender
Edited by: user10552550 on Feb 22, 2010 5:53 AMThe Oracle Database Performance Tuning Guide in the Oracle Database documentation library has a lot of information. Several chapters have "SQL" in their titles, including "SQL Tuning Overview".
However, if you're looking for third-party books, I don't know know enough about them to recommend one versus another. -
SQL Tuning using Enterprise manager in oracle 10g
Hi,
In oracle 10g you have the enterprise manager which can be used to tune sql statements using the SQL Tuning ADvisor and SQL access advisor.
I believe in oracle 10g the process of SQL Tuning is slightly easier using the Enterprise Manager ...so if some one could explain me that process...
Again thanking you in advance
regds
Manoj GokhaleHi Manoj,
Didn't you already start two other threads about this same question the SQL forum?
How do i do the SQL Statement tuning
Enterprise Manager - sql tuning advisor , Access advisor for SQL Tuning -
1Z0-117: Oracle Database 11g Release 2: SQL Tuning Need Materia and Dumps
Hi all,
We are preparing for 1Z0-117: Oracle Database 11g Release 2: SQL Tuning, There is shortage of material available on net.
Can anybody please provide books or Sample question answers and share more idea about the exan.
mail id XXXXXXXXXXXXX
Thanks in Advance
Sandeep
Edited by: 1005555 on 13 May, 2013 4:54 AM+
Mod: email deleted, don't draw discussion away from the forum.
Edited by: PhHein on 13.05.2013 14:16
Edited by: 1005555 on 13 May, 2013 10:16 PMWe are preparing for 1Z0-117: Oracle Database 11g Release 2: SQL Tuning, There is shortage of material available on net.There are actually a fair number of articles about the material covered on 117 on the net, but yes, the test is new enough that cheaters have not had much of a chance to email around illegal material such as dumps yet.
Can anybody please provide books or Dumps and share more idea about the exan.There is a significant amount of legitimate material you can use to study for the exam here:
http://www.oraclecertificationprep.com/apex/f?p=OCPSG:EXAM_DETAILS:0::NO::P2_EXAM:1Z0-117
As for ideas about the exam -- it's probably the hardest Oracle certification exam I have ever taken:
http://ocprep.blogspot.com/2013/03/1z0-117-this-exam-is-rough.html -
I am working as a junior DBA. I tried to tune a query using SQL Tuning Advisor that is with DBMS_SQLTUNE.I have created the tuning task successfully with DBMS_SQLTUNE.create_tuning_task.But when i execute the tuning task with EXEC DBMS_SQLTUNE.execute_tuning_task() i got an error like
SQL> EXEC DBMS_SQLTUNE.execute_tuning_task(task_name => 'rep_three');
BEGIN DBMS_SQLTUNE.execute_tuning_task(task_name => 'rep_three'); END;
ERROR at line 1:
ORA-00081: address range [0x60000000000A7D70, 0x60000000000A7D74) is not
readable
ORA-00600: internal error code, arguments: [kesatmGetSqlStats:optCost], [], [],
ORA-06512: at "SYS.PRVT_ADVISOR", line 1624
ORA-06512: at "SYS.DBMS_ADVISOR", line 186
ORA-06512: at "SYS.DBMS_SQLTUNE", line 1008
ORA-06512: at line 1The oracle version is Oracle Database 10g Enterprise Edition Release 10.2.0.2.0 - 64bi. The OS is HP-UX. The version is HP-UX B.11.23 U ia64.
I tried to execute DBMS_SQLTUNE as DWH user.I have granted the advisor,DROP ANY SQL PROFILE,ALTER ANY SQL PROFILE,CREATE ANY SQL PROFILE privileges and DBA roles to the DWH user. The way i ran DBMS_SQLTUNE is, first i logged in as DWH user and i tried to execute the query for getting the SQL_ID for the query. For getting the SQL_ID i selected the SQL_ID column value for the DWH user session from v$session.I kept that query executing and meanwhile i opened another session as DWH user and created the tuning task as follows
DECLARE
l_sql_tune_task_id VARCHAR2(100);
BEGIN
l_sql_tune_task_id := DBMS_SQLTUNE.create_tuning_task (
sql_id => 'b65fj39dkkb9v',
scope => DBMS_SQLTUNE.scope_limited,
time_limit => 3600,
task_name => 'rep_three',
description => 'Report Tuning');
DBMS_OUTPUT.put_line('l_sql_tune_task_id: ' || l_sql_tune_task_id);
END;
/The creation of tuning task was successful.And i executed the tuning task as follows
EXEC DBMS_SQLTUNE.execute_tuning_task(task_name => 'rep_three');The above mentioned errors came when i executed the tuning task.
I am also adding the query which i have tried to tune
select * from dwh.beneficiary_dim BEN_DIM,
(Select adr_dp_id,
adr_account_no,
ADR_ADDRESS_LINE_1 || ' ' ||
ADR_ADDRESS_LINE_2 || ' ' ||
ADR_ADDRESS_LINE_3 || ' ' ||
ADR_ADDRESS_LINE_4 as ADDRESS,
adr_pin_code,adr_phone_no,adr_fax_no
from dwh.beneficiary_address_dim where adr_type_id = 1) PERMANENT_ADD_DIM,
(Select adr_dp_id,
adr_account_no,
ADR_ADDRESS_LINE_1 || ' ' ||
ADR_ADDRESS_LINE_2 || ' ' ||
ADR_ADDRESS_LINE_3 || ' ' ||
ADR_ADDRESS_LINE_4 as ADDRESS,
adr_pin_code,adr_phone_no,adr_fax_no
from dwh.beneficiary_address_dim where adr_type_id = 2) BANK_ADD_DIM,
(Select adr_dp_id,
adr_account_no,
ADR_ADDRESS_LINE_1 || ' ' ||
ADR_ADDRESS_LINE_2 || ' ' ||
ADR_ADDRESS_LINE_3 || ' ' ||
ADR_ADDRESS_LINE_4 as ADDRESS,
adr_pin_code,adr_phone_no,adr_fax_no
from dwh.beneficiary_address_dim where adr_type_id = 3) NOM_GUARDIAN_ADD_DIM,
(Select adr_dp_id,
adr_account_no,
ADR_ADDRESS_LINE_1 || ' ' ||
ADR_ADDRESS_LINE_2 || ' ' ||
ADR_ADDRESS_LINE_3 || ' ' ||
ADR_ADDRESS_LINE_4 as ADDRESS,
adr_pin_code,adr_phone_no,adr_fax_no
from dwh.beneficiary_address_dim where adr_type_id = 4) CORR_ADD_DIM,
(Select adr_dp_id,
adr_account_no,
ADR_ADDRESS_LINE_1 || ' ' ||
ADR_ADDRESS_LINE_2 || ' ' ||
ADR_ADDRESS_LINE_3 || ' ' ||
ADR_ADDRESS_LINE_4 as ADDRESS,
adr_pin_code,adr_phone_no,adr_fax_no
from dwh.beneficiary_address_dim where adr_type_id = 6) MINOR_ADDRESS,
(Select rp.requestid as requestid,
decode(rp.value,'ALL','ALL','','ALL',decode(substr(rp.value,1,instr(rp.value,'|',1,1)-1),'','ALL',substr(rp.value,1,instr(rp.value,'|',1,1)-1))) as Name,
decode(rp.value,'ALL','ALL','','ALL',decode(substr(rp.value,(instr(rp.value,'|',1,1)+1),((instr(rp.value,'|',1,2))-(instr(rp.value,'|',1,1)+1))),'','ALL',substr(rp.value,(instr(rp.value,'|',1,1)+1),((instr(rp.value,'|',1,2))-(instr(rp.value,'|',1,1)+1))))) as Address,
decode(rp.value,'ALL','ALL','','ALL',decode(substr(rp.value,(instr(rp.value,'|',1,2)+1)),'','ALL',substr(rp.value,(instr(rp.value,'|',1,2)+1)))) as PAN
from disadmin.requestparameters rp, disadmin.requestparameters rps, disadmin.reportrequests rr
where rp.parameterid = 'CNAS_PARAM_VALUE'
and rr.status = 'A'
and rp.requestid = rr.id
and rp.id = rps.id) P_PARAM_VALUE,
(Select rp.requestid as requestid, rp.value as Type
from disadmin.requestparameters rp, disadmin.reportrequests rr
where rp.parameterid = 'CNAS_NAME_TYPE'
and rr.status = 'A'
and rp.requestid = rr.id) P_NAME_TYPE,
(Select rp.requestid as requestid, rp.value as Addtype
from disadmin.requestparameters rp, disadmin.reportrequests rr
where rp.parameterid = 'CNAS_ADDRESS_TYPE'
and rr.status = 'A'
and rp.requestid = rr.id) P_ADDRESS_TYPE
where ( 1= case when P_NAME_TYPE.Type = 'F' then
case when BEN_DIM.BDM_FIRST_HOLDER_NAME like DECODE(P_PARAM_VALUE.Name,'ALL','%'||BEN_DIM.BDM_FIRST_HOLDER_NAME||'%','%'||P_PARAM_VALUE.Name||'%')
or BEN_DIM.BDM_FIRST_HOLDER_SURNAME like DECODE(P_PARAM_VALUE.Name,'ALL','%'||BEN_DIM.BDM_FIRST_HOLDER_SURNAME||'%','%'||P_PARAM_VALUE.Name||'%')
then 1
else null end
else
case when P_NAME_TYPE.Type = 'ALL' then
case when (BEN_DIM.BDM_FIRST_HOLDER_NAME like DECODE(P_PARAM_VALUE.Name,'ALL','%'||BEN_DIM.BDM_FIRST_HOLDER_NAME||'%','%'||P_PARAM_VALUE.Name||'%')
or BEN_DIM.BDM_FIRST_HOLDER_SURNAME like DECODE(P_PARAM_VALUE.Name,'ALL','%'||BEN_DIM.BDM_FIRST_HOLDER_SURNAME||'%','%'||P_PARAM_VALUE.Name||'%'))
and BEN_DIM.BDM_SECOND_HOLDER_NAME like DECODE(P_PARAM_VALUE.Name,'ALL','%'||BEN_DIM.BDM_SECOND_HOLDER_NAME||'%','%'||P_PARAM_VALUE.Name||'%')
and BEN_DIM.BDM_THIRD_HOLDER_NAME like DECODE(P_PARAM_VALUE.Name,'ALL','%'||BEN_DIM.BDM_THIRD_HOLDER_NAME||'%','%'||P_PARAM_VALUE.Name||'%')
then 1
else null end
else null end
end )
and BEN_DIM.BDM_IT_PAN like DECODE(P_PARAM_VALUE.PAN,'ALL','%'||BEN_DIM.BDM_IT_PAN||'%','%'||P_PARAM_VALUE.PAN||'%')
and (1 = case when P_ADDRESS_TYPE.ADDTYPE = 1 then
case when instr(PERMANENT_ADD_DIM.ADDRESS, DECODE(P_PARAM_VALUE.ADDRESS,'ALL',PERMANENT_ADD_DIM.ADDRESS, P_PARAM_VALUE.ADDRESS)) <> 0
then 1
else null end
when P_ADDRESS_TYPE.ADDTYPE = 3 then
case when instr(NOM_GUARDIAN_ADD_DIM.ADDRESS, DECODE(P_PARAM_VALUE.ADDRESS,'ALL',NOM_GUARDIAN_ADD_DIM.ADDRESS, P_PARAM_VALUE.ADDRESS)) <> 0
then 1
else null end
when P_ADDRESS_TYPE.ADDTYPE = 4 then
case when instr(CORR_ADD_DIM.ADDRESS, DECODE(P_PARAM_VALUE.ADDRESS,'ALL',CORR_ADD_DIM.ADDRESS, P_PARAM_VALUE.ADDRESS)) <> 0
then 1
else null end
when P_ADDRESS_TYPE.ADDTYPE = 6 then
case when instr(MINOR_ADDRESS.ADDRESS, DECODE(P_PARAM_VALUE.ADDRESS,'ALL',MINOR_ADDRESS.ADDRESS, P_PARAM_VALUE.ADDRESS)) <> 0
then 1
else null end
else null end );The above query also tries to access some tables from another user DISADMIN. Could you please help me in solving this problem while using SQL Tuning Advisor ? I am the only DBA here.will the rows really be updated just by using the package?Considering DMLs
SQL> select * from test
2 /
NO
1
2
SQL> ed
Wrote file afiedt.buf
1 DECLARE
2 my_task_name VARCHAR2(30);
3 my_sqltext CLOB;
4 BEGIN
5 my_sqltext := 'insert into test values (3)';
6 my_task_name := DBMS_SQLTUNE.CREATE_TUNING_TASK(
7 sql_text => my_sqltext,
8 task_name => 'my_sql_tuning_task');
9* end;
SQL> /
PL/SQL procedure successfully completed.
SQL> BEGIN
2 DBMS_SQLTUNE.EXECUTE_TUNING_TASK( task_name => 'my_sql_tuning_task' );
3 END;
4 /
PL/SQL procedure successfully completed.
SQL> select * from test
2 /
NO
1
2
SQL> SELECT DBMS_SQLTUNE.REPORT_TUNING_TASK( 'my_sql_tuning_task')
2 FROM DUAL;
DBMS_SQLTUNE.REPORT_TUNING_TASK('MY_SQL_TUNING_TASK')
GENERAL INFORMATION SECTION
Tuning Task Name : my_sql_tuning_task
Tuning Task Owner : TEST
Scope : COMPREHENSIVE
Time Limit(seconds): 1800
Completion Status : COMPLETED
Started at : 03/27/2008 05:16:14
Completed at : 03/27/2008 05:16:16
DBMS_SQLTUNE.REPORT_TUNING_TASK('MY_SQL_TUNING_TASK')
Schema Name: TEST
SQL ID : gwkmgmyj9824t
SQL Text : insert into test values (3)
There are no recommendations to improve the statement.
-------------------------------------------------------------------------------Adith -
Info on Oracle Cert Expert, Oracle Database11 Release2 SQL Tuning
Searching at http://education.oracle.com/pls/web_prod-plq-dad/db_pages.getpage?page_id=39&p_org_id=1001
for database admin on Database product I' ve found a dead link for a (in my perspective) NEW (interesting) learning path: Oracle Certified Expert, Oracle Database11g Release2 SQL Tuning.
Is it a web-type mismatch or a REAL new learning path for Oracle?
Thanks
PaoloAs you say, an interesting new certification, but the link is definitely bad. Looks like they have a substitution variable that is undefined in the URL. Brandye or one of the other Oracle emps will need to notify the appropriate people.
Oracle Database 11g Performance Tuning Certified Expert
"http://education.oracle.com/pls/web_prod-plq-dad/"*db_pages.getpage?page_id=287*
Oracle Certified Expert, Oracle Database 11g Release 2 SQL Tuning
"http://education.oracle.com/pls/web_prod-plq-dad/"*CA_CERT_342_CERT_URL*
================================================
Edit: The certification is related to the following beta exam:
*1Z1-117 -- Oracle Database 11g Release 2: SQL Tuning*
Edited by: matthew_morris on Aug 20, 2012 8:46 AM -
Need help to debug SQL Tuning Advisor Error Message
Hi,
I am getting an error message while try to get recommendations from the SQL Tuning Advisor.
Environment:
Oracle Version: 11.2.0.3.0
O/S: AIX
Following is my code:
declare
my_task_name varchar2 (30);
my_sqltext clob;
begin
my_sqltext := 'SELECT DISTINCT MRKT_AREA AS DIVISION, PROMO_ID,
PROMO_CODE,
RBR_DTL_TYPE.PERF_DETL_TYP,
RBR_DTL_TYPE.PERF_DETL_DESC,
RBR_DTL_TYPE.PERF_DETL_SUB_TYP,
RBR_DTL_TYPE.PERF_DETL_SUB_DESC,
BU_SYS_ITM_NUM,
RBR_CPN_LOC_ITEM_ARCHIVE.CLI_SYS_ITM_DESC,
PROMO_START_DATE,
PROMO_END_DATE,
PROMO_VALUE2,
PROMO_VALUE1,
EXEC_COMMENTS,
PAGE_NUM,
BLOCK_NUM,
AD_PLACEMENT,
BUYER_CODE,
RBR_CPN_LOC_ITEM_ARCHIVE.CLI_STAT_TYP,
RBR_MASTER_CAL_ARCHIVE.STATUS_FLAG
FROM (PROMO_REPT_OWNER.RBR_CPN_LOC_ITEM_ARCHIVE
INNER JOIN PROMO_REPT_OWNER.RBR_MASTER_CAL_ARCHIVE
ON (RBR_CPN_LOC_ITEM_ARCHIVE.CLI_PROMO_ID = PROMO_ID)
AND (RBR_CPN_LOC_ITEM_ARCHIVE.CLI_PERF_DTL_ID = PERF_DETAIL_ID)
AND (RBR_CPN_LOC_ITEM_ARCHIVE.CLI_STR_NBR = STORE_ZONE)
AND (RBR_CPN_LOC_ITEM_ARCHIVE.CLI_ITM_ID = ITM_ID))
INNER JOIN PROMO_REPT_OWNER.RBR_DTL_TYPE
ON (RBR_MASTER_CAL_ARCHIVE.PERF_DETL_TYP = RBR_DTL_TYPE.PERF_DETL_TYP)
AND (RBR_MASTER_CAL_ARCHIVE.PERF_DETL_SUB_TYP = RBR_DTL_TYPE.PERF_DETL_SUB_TYP)
WHERE ( ((MRKT_AREA)=40)
AND ((RBR_DTL_TYPE.PERF_DETL_TYP)=1)
AND ((RBR_DTL_TYPE.PERF_DETL_SUB_TYP)=1) )
AND ((CLI_STAT_TYP)=1 Or (CLI_STAT_TYP)=6)
AND ((RBR_MASTER_CAL_ARCHIVE.STATUS_FLAG)=''A'')
AND ( ((PROMO_START_DATE) >= to_date(''2011-10-20'', ''YYYY-MM-DD'')
And (PROMO_END_DATE) <= to_date(''2011-10-26'', ''YYYY-MM-DD'')) )
ORDER BY MRKT_AREA';
my_task_name := dbms_sqltune.create_tuning_task
(sql_text => my_sqltext,
user_name => 'PROMO_REPT_OWNER',
scope => 'COMPREHENSIVE',
time_limit => 3600,
task_name => 'Test_Query',
description => 'Test Query');
end;
begin
dbms_sqltune.execute_tuning_task(task_name => 'Test_Query');
end;
set serveroutput on size unlimited;
set pagesize 5000
set linesize 130
set long 50000
set longchunksize 500000
SELECT DBMS_SQLTUNE.REPORT_TUNING_TASK('Test_Query') FROM DUAL;
Output:
snippet .....
FINDINGS SECTION (1 finding)
1- Index Finding (see explain plans section below)
The execution plan of this statement can be improved by creating one or more
indices.
Recommendation (estimated benefit: 71.48%)
- Consider running the Access Advisor to improve the physical schema design
or creating the recommended index.
Error: Cannot fetch actions for recommendation: INDEX
Error: ORA-06502: PL/SQL: numeric or value error: character string buffer too small
Rationale
Creating the recommended indices significantly improves the execution plan
of this statement. However, it might be preferable to run "Access Advisor"
using a representative SQL workload as opposed to a single statement. This
will allow to get comprehensive index recommendations which takes into
account index maintenance overhead and additional space consumption.
snippet
Any ideas why I am getting ORA-06502 error?
Thanks in advance
RogersBug 14407401 - ORA-6502 from index recommendation section of DBMS_SQLTUNE output (Doc ID 14407401.8)
Fixed:
The fix for 14407401 is first included in
12.1.0.1 (Base Release) -
Hi
I am not a sql programmer and developers have given me this sql to have a look. I made the following recommendations after going through the sql. Is there anything else that can be added . I did not add about stats because they are representative and up to date.
SELECT /*+ PARALLEL(q1,4) */ *
FROM
(SELECT /*+ FIRST_ROWS(20) */
br.resource_id,
br.resource_code,
x.resource_seq_num employee_resource_number,
br.organization_id,
bd.department_id,
bd.department_code,
pf.full_name employee_name,
(SELECT xxdl_eam_util_pkg.xxdl_eam_get_resource_code(pf.person_id, bd.department_id)
FROM dual)
maximum_cost_resource,
pf.person_id,
x.wip_entity_id wo_id,
(SELECT weo1.wip_entity_name
FROM wip_eam_work_orders_v weo1
WHERE weo1.wip_entity_id = x.wip_entity_id)
wo_number,
CAST(x.start_date AS
TIMESTAMP) start_date,
CAST(x.completion_date AS
TIMESTAMP) completion_date,
wor.operation_seq_num wo_operation_number,
wor.resource_seq_num wo_resource_number,
wor.usage_rate_or_amount HOURS,
BRE.effective_start_date instance_start_date,
BRE.effective_end_date instance_end_date,
BRE.instance_id,
crc.resource_rate AS
resource_cost,
(SELECT xxdl_eam_util_pkg.xxdl_eam_get_all_res_code(pf.person_id, bd.department_id)
FROM dual)
all_resources
FROM per_all_people_f pf,
wip_eam_work_orders_v weo,
wip_operations wo,
wip_operation_resources wor,
(SELECT instance_id,
wip_entity_id,
operation_seq_num,
resource_seq_num,
start_date,
completion_date
FROM wip_op_resource_instances_v) x,
bom_dept_res_instances bdri,
bom_resource_employees BRE,
bom_department_resources bdr,
bom_resources br,
cst_resource_costs crc,
bom_departments bd
WHERE br.organization_id = bd.organization_id
AND bdr.resource_id = br.resource_id
AND bdr.department_id = bd.department_id
AND BRE.resource_id = br.resource_id
AND pf.effective_start_date <=sysdate
AND pf.effective_end_date >= sysdate
AND pf.person_id = BRE.person_id
AND wo.department_id = bd.department_id
AND wor.operation_seq_num(+) = wo.operation_seq_num
AND wor.wip_entity_id(+) = wo.wip_entity_id
AND wor.organization_id(+) = wo.organization_id
AND weo.wip_entity_id = wo.wip_entity_id
AND weo.organization_id = wo.organization_id
-- AND weo.organization_id = 6921
AND DECODE(bd.disable_date,null, sysdate,bd.disable_date) >= sysdate
AND DECODE(br.disable_date,null, sysdate,br.disable_date) >= sysdate
AND DECODE(wo.disable_date,null, sysdate,wo.disable_date) >= sysdate
AND crc.resource_id(+) = BRE.resource_id
AND x.wip_entity_id = wor.wip_entity_id
AND x.operation_seq_num = wor.operation_seq_num
AND x.resource_seq_num = wor.resource_seq_num
AND x.instance_id(+) = BRE.instance_id
AND bdri.department_id = bd.department_id
AND bdri.resource_id = br.resource_id
AND weo.organization_id = 6921
AND bdri.department_id = 5004
UNION
SELECT /*+ FIRST_ROWS(20) */ DISTINCT NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
pf.full_name employee_name,
NULL,
pf.person_id,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL HOURS,
NULL,
NULL,
NULL,
NULL,
NULL
FROM per_all_people_f pf,
wip_eam_work_orders_v weo,
wip_operations wo,
wip_operation_resources wor,
bom_dept_res_instances bdri,
bom_resource_employees BRE,
bom_department_resources bdr,
bom_resources br,
cst_resource_costs crc,
bom_departments bd
WHERE br.organization_id = bd.organization_id
AND bdr.resource_id = br.resource_id
AND bdr.department_id = bd.department_id
AND BRE.resource_id = br.resource_id
AND pf.effective_start_date <=sysdate
AND pf.effective_end_date >= sysdate
AND pf.person_id = BRE.person_id
AND wo.department_id = bd.department_id
AND wor.operation_seq_num(+) = wo.operation_seq_num
AND wor.wip_entity_id(+) = wo.wip_entity_id
AND wor.organization_id(+) = wo.organization_id
AND weo.wip_entity_id = wo.wip_entity_id
AND weo.organization_id = wo.organization_id
AND DECODE(bd.disable_date,null, sysdate,bd.disable_date) >= sysdate
AND DECODE(br.disable_date,null, sysdate,br.disable_date) >= sysdate
AND DECODE(wo.disable_date,null, sysdate,wo.disable_date) >= sysdate
AND crc.resource_id(+) = BRE.resource_id
AND bdri.department_id = bd.department_id
AND bdri.resource_id = br.resource_id
AND weo.organization_id = 6921
AND bdri.department_id = 5004
AND NOT EXISTS
(SELECT instance_id,
wip_entity_id operation_seq_num,
resource_seq_num
FROM wip_op_resource_instances_v)
) q1
ORDER BY department_id,
resource_code,
employee_name,
wo_number
My suggestions:
. Try to use UNION ALL instead of UNION. If you can eliminate UNION all together and flatten the query that will be even better.
2. You are using the function in a select statement xxdl_eam_util_pkg.xxdl_eam_get_resource_code(pf.person_id, bd.department_id)This will slow the performance. Try to get rid of this. Function calls in select are expensive.
3. Dont use the parallel hint and optimize. It wont get you consistent results.
4. Use of per_all_people_F is expensive. The UNION again complicates things. per_all_people_f has to be scanned 2x times.
5. Where does the application get the values for department id? Whether user inputs a value or whether it is hard coded . Most likely user will input value and each time it may be different. If that is the case, then you may be hitting bind peeking. There is not much hope for this. Not much can be done. Whatever you do this can happen. Only way is to pin the plan if you can use literals instead of binds. But that is not possible I think.
6. AND DECODE(bd.disable_date,null, sysdate,bd.disable_date) >= sysdate
AND DECODE(br.disable_date,null, sysdate,br.disable_date) >= sysdate
AND DECODE(wo.disable_date,null, sysdate,wo.disable_date) >= sysdate
Those statements, if you can rewrite would be good. If there are indexes on any of those columns, they are more than likely not used.
7. Are the outer joins really required. If not required remove them.
8. There is a 'WITH' clause in 10g . Try to use that for your subqueries or main query where applicable. It will save some I/O.
9. Try to tune without any hints. Remove the first rows as well and see the difference.
I know that the sql is definately bad and can be rewritten but I am not able to exactly write it for them.
Any inputs or thoughts?
MSKHi,
Any suggestions for reading on Sql tuning
I am looking for a practical book with solutions .
And books showing the Sql internal workings ?Take a look on Amazon some Jonathan Lewis books.
I will also recommend you to take a look on the following blogs:
- http://jonathanlewis.wordpress.com/
- http://www.juliandyke.com/
- http://richardfoote.wordpress.com/
- http://tkyte.blogspot.com/
And also any good interview based good Oracle DBA books ?You can take a look on my blog for some common DBA interview questions.
http://oraclenz.com/category/interview-tips/
Regards,
Francisco Munoz Alvarez
www.oraclenz.com -
How to use Tuning Pack for SQL tuning
We're just getting started with 10g, and I'm more familiar with 9i. In OEM 9i, there was something called Oracle SQL Analyze. It allowed you to work on a problem SQL statement, adding hints, making other changes, etc., and then you could easily compare the plan for two versions of a query. You could also execute right from there and it'd let you click on a tab to view the statistics. You could compare the statistics for two versions of the same statement.
I don't see anything like this in 10.1 GC, and that's with both the Diagnostic and Tuning Packs activated. There are a number of ways you can identify an SQL for analysis, then get an explain plan, then get some recommendations. But I don't see anything that allows you to add hints, compare different versions of the explain plan, or compare the statistics for different versions of a statement.
Am I missing something?
Thanks.
DaveRodney,
Thanks for the reply. Yes, I agree, the Java console which runs directly on Windows is quite limited. Change Manager is there, as you indicated. However, MetaLink note 277066.1 indicates that "Tuning Pack Functionality" is also available in the Java version, and I don't see any of it there.
What I'm looking for is a framework for testing different versions of an SQL statement. I want to be able to execute the current version of a statement and, for example, a modified version with a hint added. I want to be able to see at least the basic statisitics comparing the two exections (e.g., elapsed time, logical reads, physical reads). This was possible with SQL Analyze in 9i, but I can't find anything like it in 10g.
I have found both the 10g advisors you mentioned and they do seem to work, but they don't provide the same flexibility and power for working on statement tuning apart from what the advisors recommend.
Thanks for all the suggestions/ideas...
Dave -
Deadlock in Oracle.sql.ARRAY type
Hi,
We've come across the deadlock situation below when running multiple J2EE MDB instances that are trying to write to the DB:
[deadlocked thread] [ACTIVE] ExecuteThread: '7' for queue: 'weblogic.kernel.Default (self-tuning)':
Thread '[ACTIVE] ExecuteThread: '7' for queue: 'weblogic.kernel.Default (self-tuning)'' is waiting to acquire lock 'oracle.jdbc.driver.T4CConnection@90106ee' that is held by thread '[ACTIVE] ExecuteThread: '8' for queue: 'weblogic.kernel.Default (self-tuning)''
Stack trace:
oracle.sql.ARRAY.toBytes(ARRAY.java:673)
oracle.jdbc.driver.OraclePreparedStatement.setArrayCritical(OraclePreparedStatement.java:5985)
oracle.jdbc.driver.OraclePreparedStatement.setARRAYInternal(OraclePreparedStatement.java:5944)
oracle.jdbc.driver.OraclePreparedStatement.setObjectCritical(OraclePreparedStatement.java:8782)
oracle.jdbc.driver.OraclePreparedStatement.setObjectInternal(OraclePreparedStatement.java:8278)
oracle.jdbc.driver.OraclePreparedStatement.setObject(OraclePreparedStatement.java:8868)
oracle.jdbc.driver.OraclePreparedStatementWrapper.setObject(OraclePreparedStatementWrapper.java:240)
weblogic.jdbc.wrapper.PreparedStatement.setObject(PreparedStatement.java:287)
org.springframework.jdbc.core.StatementCreatorUtils.setValue(StatementCreatorUtils.java:356)
org.springframework.jdbc.core.StatementCreatorUtils.setParameterValueInternal(StatementCreatorUtils.java:216)
org.springframework.jdbc.core.StatementCreatorUtils.setParameterValue(StatementCreatorUtils.java:127)
org.springframework.jdbc.core.PreparedStatementCreatorFactory$PreparedStatementCreatorImpl.setValues(PreparedStatementCreatorFactory.java:298)
org.springframework.jdbc.object.BatchSqlUpdate$1.setValues(BatchSqlUpdate.java:192)
org.springframework.jdbc.core.JdbcTemplate$4.doInPreparedStatement(JdbcTemplate.java:892)
org.springframework.jdbc.core.JdbcTemplate$4.doInPreparedStatement(JdbcTemplate.java:1)
org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:586)
org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:614)
org.springframework.jdbc.core.JdbcTemplate.batchUpdate(JdbcTemplate.java:883)
org.springframework.jdbc.object.BatchSqlUpdate.flush(BatchSqlUpdate.java:184)
com.csfb.fao.rds.rfi.common.dao.storedprocs.SaveEarlyExceptionBatchStoredProc.execute(SaveEarlyExceptionBatchStoredProc.java:93)
com.csfb.fao.rds.rfi.common.dao.EarlyExceptionDAOImpl.saveEarlyExceptionBatch(EarlyExceptionDAOImpl.java:34)
com.csfb.fao.rds.rfi.application.rulesengine.RulesEngine.saveEarlyExceptions(RulesEngine.java:302)
com.csfb.fao.rds.rfi.application.rulesengine.RulesEngine.executeRules(RulesEngine.java:209)
com.csfb.fao.rds.rfi.application.rulesengine.RulesEngine.onMessage(RulesEngine.java:97)
com.csfb.fao.rds.feeds.process.BaseWorkerMDB.onMessage(BaseWorkerMDB.java:518)
weblogic.ejb.container.internal.MDListener.execute(MDListener.java:466)
weblogic.ejb.container.internal.MDListener.transactionalOnMessage(MDListener.java:371)
weblogic.ejb.container.internal.MDListener.onMessage(MDListener.java:327)
weblogic.jms.client.JMSSession.onMessage(JMSSession.java:4547)
weblogic.jms.client.JMSSession.execute(JMSSession.java:4233)
weblogic.jms.client.JMSSession.executeMessage(JMSSession.java:3709)
weblogic.jms.client.JMSSession.access$000(JMSSession.java:114)
weblogic.jms.client.JMSSession$UseForRunnable.run(JMSSession.java:5058)
weblogic.work.SelfTuningWorkManagerImpl$WorkAdapterImpl.run(SelfTuningWorkManagerImpl.java:516)
weblogic.work.ExecuteThread.execute(ExecuteThread.java:201)
weblogic.work.ExecuteThread.run(ExecuteThread.java:173)
[deadlocked thread] [ACTIVE] ExecuteThread: '8' for queue: 'weblogic.kernel.Default (self-tuning)':
Thread '[ACTIVE] ExecuteThread: '8' for queue: 'weblogic.kernel.Default (self-tuning)'' is waiting to acquire lock 'oracle.jdbc.driver.T4CConnection@b48b568' that is held by thread '[ACTIVE] ExecuteThread: '7' for queue: 'weblogic.kernel.Default (self-tuning)''
Stack trace:
oracle.sql.ARRAY.toBytes(ARRAY.java:673)
oracle.jdbc.driver.OraclePreparedStatement.setArrayCritical(OraclePreparedStatement.java:5985)
oracle.jdbc.driver.OraclePreparedStatement.setARRAYInternal(OraclePreparedStatement.java:5944)
oracle.jdbc.driver.OraclePreparedStatement.setObjectCritical(OraclePreparedStatement.java:8782)
oracle.jdbc.driver.OraclePreparedStatement.setObjectInternal(OraclePreparedStatement.java:8278)
oracle.jdbc.driver.OraclePreparedStatement.setObject(OraclePreparedStatement.java:8868)
oracle.jdbc.driver.OraclePreparedStatementWrapper.setObject(OraclePreparedStatementWrapper.java:240)
weblogic.jdbc.wrapper.PreparedStatement.setObject(PreparedStatement.java:287)
org.springframework.jdbc.core.StatementCreatorUtils.setValue(StatementCreatorUtils.java:356)
org.springframework.jdbc.core.StatementCreatorUtils.setParameterValueInternal(StatementCreatorUtils.java:216)
org.springframework.jdbc.core.StatementCreatorUtils.setParameterValue(StatementCreatorUtils.java:127)
org.springframework.jdbc.core.PreparedStatementCreatorFactory$PreparedStatementCreatorImpl.setValues(PreparedStatementCreatorFactory.java:298)
org.springframework.jdbc.object.BatchSqlUpdate$1.setValues(BatchSqlUpdate.java:192)
org.springframework.jdbc.core.JdbcTemplate$4.doInPreparedStatement(JdbcTemplate.java:892)
org.springframework.jdbc.core.JdbcTemplate$4.doInPreparedStatement(JdbcTemplate.java:1)
org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:586)
org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:614)
org.springframework.jdbc.core.JdbcTemplate.batchUpdate(JdbcTemplate.java:883)
org.springframework.jdbc.object.BatchSqlUpdate.flush(BatchSqlUpdate.java:184)
com.csfb.fao.rds.rfi.common.dao.storedprocs.SaveEarlyExceptionBatchStoredProc.execute(SaveEarlyExceptionBatchStoredProc.java:93)
com.csfb.fao.rds.rfi.common.dao.EarlyExceptionDAOImpl.saveEarlyExceptionBatch(EarlyExceptionDAOImpl.java:34)
com.csfb.fao.rds.rfi.application.rulesengine.RulesEngine.saveEarlyExceptions(RulesEngine.java:302)
com.csfb.fao.rds.rfi.application.rulesengine.RulesEngine.executeRules(RulesEngine.java:209)
com.csfb.fao.rds.rfi.application.rulesengine.RulesEngine.onMessage(RulesEngine.java:97)
com.csfb.fao.rds.feeds.process.BaseWorkerMDB.onMessage(BaseWorkerMDB.java:518)
weblogic.ejb.container.internal.MDListener.execute(MDListener.java:466)
weblogic.ejb.container.internal.MDListener.transactionalOnMessage(MDListener.java:371)
weblogic.ejb.container.internal.MDListener.onMessage(MDListener.java:327)
weblogic.jms.client.JMSSession.onMessage(JMSSession.java:4547)
weblogic.jms.client.JMSSession.execute(JMSSession.java:4233)
weblogic.jms.client.JMSSession.executeMessage(JMSSession.java:3709)
weblogic.jms.client.JMSSession.access$000(JMSSession.java:114)
weblogic.jms.client.JMSSession$UseForRunnable.run(JMSSession.java:5058)
weblogic.work.SelfTuningWorkManagerImpl$WorkAdapterImpl.run(SelfTuningWorkManagerImpl.java:516)
weblogic.work.ExecuteThread.execute(ExecuteThread.java:201)
weblogic.work.ExecuteThread.run(ExecuteThread.java:173)
Looking at the ARRAY.toBytes() method:
public byte[] toBytes()
throws SQLException
synchronized (getInternalConnection())
return this.descriptor.toBytes(this, this.enableBuffering);
..., it synchronizes on the following method (getInternalConnection() -> getPhysicalConnection()):
oracle.jdbc.internal.OracleConnection getPhysicalConnection()
if (this.physicalConnection == null)
try
this.physicalConnection = ((oracle.jdbc.internal.OracleConnection)new OracleDriver().defaultConnection());
catch (SQLException localSQLException)
return this.physicalConnection;
defaultConnection() does the following:
public Connection defaultConnection()
throws SQLException
if ((defaultConn == null) || (defaultConn.isClosed()))
synchronized (OracleDriver.class)
if ((defaultConn == null) || (defaultConn.isClosed()))
defaultConn = connect("jdbc:oracle:kprb:", new Properties());
return defaultConn;
So there's synchronizations on the connection instance and OracleDriver.class object... I can't see how this can deadlock. To get to the point of needing the lock on OracleDriver.class, the thread would already have the lock on the connection instance.... clearly I'm missing something.
Thanks
Edited by: 928154 on 17-Apr-2012 03:42Welcome to the forum. If you want help, at least try to think where to post a question and look for a forum that matches the topic. Lets examine what you have:
- its Weblogic, so if you would ask a non-programming related question anywhere it would be in the Weblogic forum
- HOWEVER, if you check the top of the stacktrace, you'll see that the problem stems from the JDBC driver, so a JDBC related forum would be a closer match
For future reference, Weblogic specific questions should go here: https://forums.oracle.com/forums/category.jspa?categoryID=193
and JDBC/OJDBC driver related questions should go here: Java Database Connectivity (JDBC)
Final tip: use \ tags to post code so it is readable. -
Hi All,
I am new to tuning.
Can somebody help me in tuning this SQL query.
SELECT pppd.productid, pppd.sequencenumber, pppd.priceareaid, pppd.startdate, pppd.qtyfrom, pppd.enddate, pppd.price,
pppd.articleid, pppd.customerid, pppd.distributorid, pppd.supplierid, pppd.adviceprice, pppd.customergroupid, pppd.dimensionvalue1, pppd.dimensionvalue2,
pppd.dimensionvalue3, pppd.dimensionvalue4, pppd.dimensionvalue5, pppd.dimensionvalue6, pppd.discountpercentage,
pppd.promotionindicator, pppd.vatindicator
FROM PPM_PRODUCTPRICE pppd WHERE
pppd.validindicator=1 AND pppd.startdate <= SYSDATE AND NVL(pppd.enddate,SYSDATE +1) >= SYSDATE
AND NOT EXISTS
(SELECT 1 FROM PPM_PRODUCTPRICE pppd2 WHERE pppd2.productid = pppd.productid
AND NOT (pppd2.sequencenumber = pppd.sequencenumber)
AND pppd2.priceareaid = pppd.priceareaid
AND (NVL(pppd2.supplierid,9999999999) = NVL(pppd.supplierid,9999999999) )
AND (NVL(pppd2.distributorid,9999999999) = NVL(pppd.distributorid,9999999999))
AND (NVL(pppd2.customerid,9999999999) = NVL(pppd.customerid,9999999999) )
AND (NVL(pppd2.customergroupid,9999999999) = NVL(pppd.customergroupid,9999999999))
AND (NVL(pppd2.articleid,9999999999) = NVL(pppd.articleid,9999999999))
AND (NVL(pppd2.dimensionvalue1,9999999999)=NVL(pppd.dimensionvalue1,9999999999))
AND (NVL(pppd2.dimensionvalue2,9999999999)=NVL(pppd.dimensionvalue2 ,9999999999))
AND (NVL(pppd2.dimensionvalue3,9999999999)=NVL(pppd.dimensionvalue3 ,9999999999))
AND (NVL(pppd2.dimensionvalue4,9999999999)=NVL(pppd.dimensionvalue4 ,9999999999))
AND (NVL(pppd2.dimensionvalue5,9999999999)=NVL(pppd.dimensionvalue5 ,9999999999))
AND (NVL(pppd2.dimensionvalue6,9999999999)=NVL(pppd.dimensionvalue6 ,9999999999))
AND pppd2.qtyfrom = pppd.qtyfrom AND pppd2.startdate BETWEEN pppd.startdate AND SYSDATE
AND NVL(pppd2.enddate,SYSDATE +1) >= SYSDATE )
AND productid= 30700At a minimum I think you should search the forums for SQL Tuning because I know there is some sort of sticked post identifying the GENERAL steps you should follow to tune a query. Us being here trying to help cannot tune a blanket SQL statement for the most part that is given to us. We don't know so many things that it is hard to form a cohesive answer. Some questions that arise are:
1. What version of Oracle are you using?
2. What are the table structures?
3. What is the question you are truly trying to answer?
4. What is the explain plan saying?
5. What is your tuning goal (faster execution? lower I/O?)?
5. etc.....
At a minimum it appears that you are using the NVL function a lot and I would probably wager a guess that it is preventing you from using indexes on all those ID columns, if there are any.
Hope this helps!
Edited by: Centinul on Sep 12, 2008 12:31 PM
Here is the link to the post I was discussing: When your query takes too long ...
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