Query Tuning requirements.
Hello
I'm not as good as in sql queries and joins the digital smart writing Sql.
Think of me as a dba and task is to resolve queries wrong, what I should know basic, intermediate, advance level query tuning. also consider that the developers have only a large part of the knowledge to optimize queries.
Query tuning requires knowledge of PL/SQL? because the guys on developer close to me wrote anonymous PL/SQL blocks most of the time.
Thank you
user12187861 wrote:
Hello
I'm not as good as in sql queries and joins the digital smart writing Sql.
Think of me as a dba and task is to resolve queries wrong, what I should know basic, intermediate, advance level query tuning. also consider that the developers have only a large part of the knowledge to optimize queries.
Query tuning requires knowledge of PL/SQL? because the guys on developer close to me wrote anonymous PL/SQL blocks most of the time.
Thank you
Setup of the query can be taught on the forums. Please buy Troubleshooting Oracle Performance (Apress), CBO Fundamentals (Apress) and Oracle practice 8i(Addison Wesley) and read them with a blanket. In the meantime read to keep on trying to make efforts to make queries resolved in accordance with instructions learned in these books.
Good luck!
Aman...
Tags: Database
Similar Questions
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Please answer for the query tuning
Hi, I am a beginner in oracle dba, I need to know if I have studied little query tuning ORACLE.
I want to know if I have the following query and its plan so how it can be tuned:
QUERY:
AND his plan is:SELECT z.emplid ,h.first_name || ' ' || h.last_name ,z.grade ,z.DEPTID ,z.LOCATION FROM sysadm.ps_lnt_latestbu_vw z, sysadm.ps_personal_data h WHERE z.empl_status ='A' --index access AND z.emplid = h.emplid --join and z.emplid not in (select g.emplid from sysadm.ps_lnt_asn_skl_tbl g) --join and z.Business_unit= ( select l.lnt_subunit from sysadm.ps_position_data l where l.position_nbr in ( select b.position_nbr from sysadm.ps_job b,sysadm.psoprdefn y where b.effdt=( select max(g.effdt) from sysadm.ps_job g where g.emplid=b.emplid --join costs high and g.effdt<=SYSDATE) --filter/index and b.effseq= (select max(h.effseq) from sysadm.ps_job h where h.emplid=b.emplid --join costs high and h.effdt=b.effdt) --join costs high and b.empl_rcd=0 --filter/index access and y.EMPLID=b.EMPLID --join and y.OPRID='1112' -- filter/index access ) ) order by z.emplid /
My thoughts for this is:Execution Plan ---------------------------------------------------------- 0 SELECT STATEMENT Optimizer=CHOOSE (Cost=6 Card=1 Bytes=64) 1 0 SORT (ORDER BY) (Cost=6 Card=1 Bytes=64) 2 1 NESTED LOOPS (ANTI) (Cost=4 Card=1 Bytes=64) 3 2 NESTED LOOPS (Cost=3 Card=1 Bytes=56) 4 3 VIEW OF 'PS_LNT_LATESTBU_VW' (Cost=2 Card=1 Bytes=31) 5 4 UNION-ALL 6 5 CONCATENATION 7 6 TABLE ACCESS (BY INDEX ROWID) OF 'PS_POSITION_DATA' (Cost=5 Card=90 Bytes=1890) 8 7 NESTED LOOPS 9 8 NESTED LOOPS (Cost=275 Card=1 Bytes=90) 10 9 NESTED LOOPS (Cost=275 Card=1 Bytes=82) 11 10 TABLE ACCESS (BY INDEX ROWID) OF 'PS_JOB' (Cost=3 Card=1 Bytes=50) 12 11 INDEX (RANGE SCAN) OF 'PS2JOB' (NON-UNIQUE) (Cost=2 Card=1) 13 12 SORT (AGGREGATE) 14 13 FIRST ROW (Cost=3 Card=1 Bytes=19) 15 14 INDEX (RANGE SCAN (MIN/MAX)) OF 'PSAJOB' (NON-UNIQUE) (Cost=3 Card=207700) 16 12 SORT (AGGREGATE) 17 16 FIRST ROW (Cost=3 Card=1 Bytes=22) 18 17 INDEX (RANGE SCAN (MIN/MAX)) OF 'PSAJOB' (NON-UNIQUE) (Cost=3 Card=207700) 19 10 INDEX (UNIQUE SCAN) OF 'PS_EMPLOYMENT'(UNIQUE) 20 9 INDEX (UNIQUE SCAN) OF 'PS_PERSONAL_DATA' (UNIQUE) 21 8 INDEX (RANGE SCAN) OF 'PS_POSITION_DATA' (UNIQUE) (Cost=5 Card=90) 22 6 FILTER 23 22 NESTED LOOPS (Cost=275 Card=1 Bytes=90) 24 23 NESTED LOOPS (Cost=275 Card=1 Bytes=82) 25 24 NESTED LOOPS (Cost=275 Card=1 Bytes=71) 26 25 INDEX (FAST FULL SCAN) OF 'PS8POSITION_DATA' (NON-UNIQUE) (Cost=5 Card=90 Bytes=1890) 27 25 TABLE ACCESS (BY INDEX ROWID) OF 'PS_JOB' (Cost=3 Card=1 Bytes=50) 28 27 INDEX (RANGE SCAN) OF 'PS2JOB' (NON-UNIQUE) (Cost=2 Card=1) 29 28 SORT (AGGREGATE) 30 29 FIRST ROW (Cost=3 Card=1 Bytes=22) 31 30 INDEX (RANGE SCAN (MIN/MAX)) OF 'PSAJOB' (NON-UNIQUE) (Cost=3 Card=207700) 32 28 SORT (AGGREGATE) 33 32 FIRST ROW (Cost=3 Card=1 Bytes=19) 34 33 INDEX (RANGE SCAN (MIN/MAX)) OF 'PSAJOB' (NON-UNIQUE) (Cost=3 Card=207700) 35 24 INDEX (UNIQUE SCAN) OF 'PS_EMPLOYMENT' (UNIQUE) 36 23 INDEX (UNIQUE SCAN) OF 'PS_PERSONAL_DATA'(UNIQUE) 37 22 SORT (AGGREGATE) 38 37 FIRST ROW (Cost=2 Card=1 Bytes=17) 39 38 INDEX (RANGE SCAN (MIN/MAX)) OF 'PS_POSITION_DATA' (UNIQUE) (Cost=2 Card=9000) 40 5 FILTER 41 40 NESTED LOOPS (Cost=751 Card=1 Bytes=191) 42 41 NESTED LOOPS (OUTER) (Cost=750 Card=1 Bytes=167) 43 42 NESTED LOOPS (OUTER) (Cost=749 Card=1 Bytes=143) 44 43 NESTED LOOPS (Cost=748 Card=1 Bytes=134) 45 44 NESTED LOOPS (Cost=748 Card=1 Bytes=123) 46 45 NESTED LOOPS (Cost=748 Card=1 Bytes=119) 47 46 NESTED LOOPS (Cost=747 Card=1 Bytes=98) 48 47 NESTED LOOPS (Cost=744 Card=1 Bytes=62) 49 48 NESTED LOOPS (Cost=744 Card=1Bytes=54) 50 49 VIEW OF 'PS_LNTPRJOBSYSJRVW'(Cost=741 Card=1 Bytes=9) 51 50 FILTER 52 51 NESTED LOOPS (OUTER) (Cost=735 Card=1 Bytes=68) 53 52 NESTED LOOPS (Cost=734Card=1 Bytes=51) 54 53 NESTED LOOPS (Cost=734 Card=1 Bytes=43) 55 54 TABLE ACCESS (BY INDEX ROWID) OF 'PS_JOB' (Cost=734 Card=1 Bytes=32) 56 55 INDEX (RANGE SCAN) OF 'PSCJOB' (NON-UNIQUE) (Cost=206 Card=1013) 57 54 INDEX (UNIQUE SCAN) OF 'PS_EMPLOYMENT' (UNIQUE) 58 53 INDEX (UNIQUE SCAN) OF 'PS_PERSONAL_DATA' (UNIQUE) 59 52 INDEX (RANGE SCAN) OF'PS_POSITION_DATA' (UNIQUE) (Cost=1 Card=1 Bytes=17) 60 51 SORT (AGGREGATE) 61 60 FIRST ROW (Cost=3 Card=1 Bytes=19) 62 61 INDEX (RANGE SCAN (MIN/MAX)) OF 'PSAJOB' (NON-UNIQUE) (Cost=3 Card=207700) 63 51 SORT (AGGREGATE) 64 63 FIRST ROW (Cost=3 Card=1 Bytes=22) 65 64 INDEX (RANGE SCAN (MIN/MAX)) OF 'PSAJOB' (NON-UNIQUE) (Cost=3 Card=207700) 66 51 SORT (AGGREGATE) 67 66 FIRST ROW (Cost=2 Card=1 Bytes=17) 68 67 INDEX (RANGE SCAN (MIN/MAX)) OF 'PS_POSITION_DATA' (UNIQUE) (Cost=2 Card=9000) 69 49 TABLE ACCESS (BY INDEX ROWID) OF 'PS_JOB' (Cost=3 Card=1 Bytes=45) 70 69 INDEX (RANGE SCAN) OF 'PSAJOB' (NON-UNIQUE) (Cost=2 Card=1) 71 70 SORT (AGGREGATE) 72 71 INDEX (RANGE SCAN) OF'PSAJOB' (NON-UNIQUE) (Cost=3 Card=1 Bytes=19) 73 72 SORT (AGGREGATE) 74 73 FIRST ROW (Cost=3Card=8 Bytes=88) 75 74 INDEX (RANGE SCAN (MIN/MAX)) OF 'PSAJOB' (NON-UNIQUE) (Cost=3 Card=25963) 76 70 SORT (AGGREGATE) 77 76 FIRST ROW (Cost=3 Card=8 Bytes=88) 78 77 INDEX (RANGE SCAN (MIN/MAX)) OF 'PSAJOB' (NON-UNIQUE) (Cost=3 Card=25963) 79 48 INDEX (UNIQUE SCAN) OF 'PS_PERSONAL_DATA' (UNIQUE) 80 47 TABLE ACCESS (BY INDEX ROWID) OF'PS_JOB' (Cost=3 Card=1 Bytes=36) 81 80 INDEX (RANGE SCAN) OF 'PSAJOB'(NON-UNIQUE) (Cost=2 Card=1) 82 81 SORT (AGGREGATE) 83 82 FIRST ROW (Cost=3 Card=1 Bytes=19) 84 83 INDEX (RANGE SCAN (MIN/MAX)) OF 'PSAJOB' (NON-UNIQUE) (Cost=3 Card=207700) 85 81 SORT (AGGREGATE) 86 85 FIRST ROW (Cost=3 Card=1 Bytes=22) 87 86 INDEX (RANGE SCAN (MIN/MAX)) OF 'PSAJOB' (NON-UNIQUE) (Cost=3 Card=207700) 88 46 INDEX (RANGE SCAN) OF 'PS8POSITION_DATA' (NON-UNIQUE) (Cost=1 Card=1 Bytes=21) 89 45 INDEX (UNIQUE SCAN) OF 'PS_BUS_UNIT_TBL_HR' (UNIQUE) 90 44 INDEX (UNIQUE SCAN) OF 'PS_EMPLOYMENT'(UNIQUE) 91 43 INDEX (RANGE SCAN) OF 'PS_POSITION_DATA'(UNIQUE) (Cost=1 Card=1 Bytes=9) 92 42 INDEX (FULL SCAN) OF 'PS0LOCATION_TBL' (NON-UNIQUE) (Cost=1 Card=1 Bytes=24) 93 41 INDEX (RANGE SCAN) OF 'PS0LOCATION_TBL' (NON-UNIQUE) (Cost=1 Card=1 Bytes=24) 94 40 SORT (AGGREGATE) 95 94 FIRST ROW (Cost=2 Card=1 Bytes=17) 96 95 INDEX (RANGE SCAN (MIN/MAX)) OF 'PS_POSITION_DATA' (UNIQUE) (Cost=2 Card=9000) 97 4 TABLE ACCESS (BY INDEX ROWID) OF 'PS_POSITION_DATA' (Cost=2 Card=1 Bytes=13) 98 97 NESTED LOOPS (Cost=9 Card=1 Bytes=19) 99 98 VIEW OF 'VW_NSO_1' (Cost=5 Card=1 Bytes=6) 100 99 SORT (UNIQUE) 101 100 NESTED LOOPS (Cost=5 Card=1 Bytes=44) 102 101 TABLE ACCESS (BY INDEX ROWID) OF 'PSOPRDEFN' (Cost=2 Card=1 Bytes=14) 103 102 INDEX (UNIQUE SCAN) OF 'PS_PSOPRDEFN'(UNIQUE) (Cost=1 Card=1) 104 101 TABLE ACCESS (BY INDEX ROWID) OF 'PS_JOB' (Cost=3 Card=1 Bytes=30) 105 104 INDEX (RANGE SCAN) OF 'PSAJOB' (NON-UNIQUE) (Cost=2 Card=1) 106 105 SORT (AGGREGATE) 107 106 INDEX (RANGE SCAN) OF 'PSAJOB' (NON-UNIQUE) (Cost=3 Card=8 Bytes=128) 108 105 SORT (AGGREGATE) 109 108 INDEX (RANGE SCAN) OF 'PSAJOB' (NON-UNIQUE) (Cost=3 Card=1 Bytes=19) 110 98 INDEX (RANGE SCAN) OF 'PS_POSITION_DATA' (UNIQUE) (Cost=1 Card=1) 111 3 TABLE ACCESS (BY INDEX ROWID) OF 'PS_PERSONAL_DATA'(Cost=1 Card=1 Bytes=25) 112 111 INDEX (UNIQUE SCAN) OF 'PS_PERSONAL_DATA' (UNIQUE) 113 2 INDEX (RANGE SCAN) OF 'PS_LNT_ASN_SKL_TBL' (UNIQUE) (Cost=1 Card=10076 Bytes=80608) } Statistics ---------------------------------------------------------- 70 recursive calls 0 db block gets 1186931 consistent gets 5660 physical reads 60 redo size 462 bytes sent via SQL*Net to client 373 bytes received via SQL*Net from client 2 SQL*Net roundtrips to/from client 2 sorts (memory) 0 sorts (disk) 0 rows processed
1 NLJ high cost - rewrite a subquery internal
2. sort is performed for each join for max function every time so try so use use sort merge hint
3 h alias has been referenced twice for the name of the table.
PLEASE ME TELL IF I AM ORACLE DBA.
Thanks in advance.
Published by: user2060331 on March 25, 2010 09:17
Published by: user2060331 on March 25, 2010 09:21
Published by: user2060331 on March 25, 2010 09:32
Published by: user2060331 on March 25, 2010 09:47Seriously, peoplel aren't going to be able to read your message in this format on the forum.
Use the button Edit to edit your post and make sure your code/explain plants etc has {noformat}
{noformat} tags both before and after it so that the formatting is retained and we can read it. -
SQL Query Tuning (large table)
Hi all
Ask your help for Tuning below mentioned simple query.
SELECT distinct BROKER_CODE FROM PROCESSED_TRXNS WHERE FOLIO_NO = '101302'Top query takes about 15 seconds to give the output.
Explain the plan: -.
Hash value of plan: 2775832988
-----------------------------------------------------------------------------------------
| ID | Operation | Name | Lines | Bytes | Cost (% CPU). Time |
-----------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 29. 609 | 38241 (1) | 00:07:39 |
| 1. UNIQUE NOSORT FATE. | 29. 609 | 38241 (1) | 00:07:39 |
|* 2 | INDEX SKIP SCAN | PROCTRAN_BRC_FN_C1 | 29. 609 | 38240 (1) | 00:07:39 |
-----------------------------------------------------------------------------------------Information of predicates (identified by the operation identity card):
---------------------------------------------------2 - access ("FOLIO_NO" = '101302')
Filter ("FOLIO_NO" = '101302')
Additional info: -.
SELECT COUNT (1) IN PROCESSED_TRXNS - 135989170Composite index on BROKER_CODE, FOLIO_NO in the table
The optimizer expects that the skip scan to take at 7:39 min - so the 15 sec are not so bad. And I'm sure that the operation is faster than a full Table Scan on PROCESSED_TRXNS. If you do not have a post adjustment index more then the skip scan might indeed be the best available strategy. I expect an index on PROCESSED_TRXNS (FOLIO_NO, BROKER_CODE) to be more effective for the query, because it should allow a range of index analysis which should read only the part of the index with the given FOLIO_NO. But create additional indexes will obviously slow down DML and could have an impact on other query execution plans (and not necessarily a positive impact).
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Query patterns: required field
Using 11g, I created a basic application model, and it is clear how fields visible/not visible and limited to certain comments, but how do I make some of the required/not required form fields?Certainly, there is problem in the dataset query
Please check with above sample AttributeReference for research. ensure that field to display and record-field
-Kuldeep
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I have a question that needs to be tuned... This query is executed a lot of time during the day so total run time is high... Here are the details
Please let me know if more info I neededqUERY SELECT col1 , col2 , col3 FROM table1 WHERE col4 = '200' AND col2 IN ('123ABC','234/AF','AKJF/R','67KJAF/S','AD45/R') AND COL1 IN ('NEWY','OHIO','WADC','CALI','PHYL','ILLI') AND COL5 = ' '; SQL> select banner from v$version 2 ; BANNER ---------------------------------------------------------------- Oracle Database 10g Enterprise Edition Release 10.2.0.2.0 - 64bi PL/SQL Release 10.2.0.2.0 - Production CORE 10.2.0.2.0 Production TNS for Solaris: Version 10.2.0.2.0 - Production NLSRTL Version 10.2.0.2.0 - Production SQL> select banner from v$version 2 ; BANNER ---------------------------------------------------------------- Oracle Database 10g Enterprise Edition Release 10.2.0.2.0 - 64bi PL/SQL Release 10.2.0.2.0 - Production CORE 10.2.0.2.0 Production TNS for Solaris: Version 10.2.0.2.0 - Production NLSRTL Version 10.2.0.2.0 - Production SQL> SHOW PARAMETER OPTIMIZER NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ _optimizer_mjc_enabled boolean FALSE optimizer_dynamic_sampling integer 2 optimizer_features_enable string 10.2.0.2 optimizer_index_caching integer 0 optimizer_index_cost_adj integer 20 optimizer_mode string ALL_ROWS optimizer_secure_view_merging boolean TRUE SQL> show parameter db_file_multi NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ db_file_multiblock_read_count integer 128 SQL> show parameter cursor_sharing NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ cursor_sharing string EXACT SQL> column sname format a20 SQL> column pname format a20 SQL>column pval2 format a20 select sname, pname, pval1, pval2 SQL> from sys.aux_stats$; SNAME PNAME PVAL1 PVAL2 -------------------- -------------------- ---------- -------------------- SYSSTATS_INFO STATUS COMPLETED SYSSTATS_INFO DSTART 11-10-2009 13:57 SYSSTATS_INFO DSTOP 11-10-2009 13:57 SYSSTATS_INFO FLAGS 1 SYSSTATS_MAIN CPUSPEEDNW 1417.876 SYSSTATS_MAIN IOSEEKTIM 11.022 SYSSTATS_MAIN IOTFRSPEED 15576.989 SYSSTATS_MAIN SREADTIM 2.844 SYSSTATS_MAIN MREADTIM .829 SYSSTATS_MAIN CPUSPEED 715 SYSSTATS_MAIN MBRC 8 SNAME PNAME PVAL1 PVAL2 -------------------- -------------------- ---------- -------------------- SYSSTATS_MAIN MAXTHR 19869696 SYSSTATS_MAIN SLAVETHR 13 rows selected. SQL> explain plan for SELECT col1 , col2 , col3 FROM table1 WHERE col4 = '200' AND col2 IN ('123ABC','234/AF','AKJF/R','67KJAF/S','AD45/R') AND COL1 IN ('NEWY','OHIO','WADC','CALI','PHYL','ILLI') AND COL5 = ' '; 4 Explained. SQL> select * from table(dbms_xplan.display); PLAN_TABLE_OUTPUT -------------------------------------------------------------------------------- ---------------------------------------------------------------------------- | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| ---------------------------------------------------------------------------- | 0 | SELECT STATEMENT | | 27 | 783 | 12 (9)| | 1 | INLIST ITERATOR | | | | | | 2 | TABLE ACCESS BY INDEX ROWID| TABLE1 | 27 | 783 | 11 (0)| | 3 | INDEX RANGE SCAN | INDEX1 | 27 | | 7 (0)| ---------------------------------------------------------------------------- Note PLAN_TABLE_OUTPUT -------------------------------------------------------------------------------- ----- - 'PLAN_TABLE' is old version 13 rows selected.
Published by: njafri on January 5, 2010 13:33
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dbms_sqltune, need to create a task for SQL 16 pages query tuning
Gurus,
They gave me 16 pages (pages in MS Word :), well, this isn't very funny, query.)
DBMS_SQLTUNE. CREATE_TUNING_TASK accepts sql_text as VARCHAR2, but the chain is medium length.
Any ideas on how this can be addressed?
I don't have sqlid.
Thank you
Anatoliy
He accepts sql_text as a CLOB.
-
Hi all
This my table structure.
create table t_department (td_code varchar2 (10), td_description varchar2 (200));
This table contains 1 million records.
It's my request,
Select td_code. » -'|| td_description search_term,
of t_department
where REGEXP_LIKE (upper(td_code||) e -'|| td_description), Upper ('ISS'), 'i');
If running above query, it takes 10 seconds. But, the two columns (td_code, td_description) of the index. Always take the time.
But if I run like query below, it will take only 0.53 seconds.
Select td_code. » -'|| td_description search_term,of t_department
where td_code like UPPER ('IGB%');
Please help me on this.
Kind regards
Fame
Maybe
Select td_code |' | ' || td_description search_term,
of t_department
where instr (lower (td_code |'|)) ' || td_description), lower (:user_input)) > 0
Concerning
Etbin
-
With functions in the SQL query tuning
Hello
I'm trying to settle a query with functions in the select section. You wonder how to see the results of the plan to explain these features included. Will there be a qs to include when you run the explain plan command
Thank you
Hilton
Oracle Database 11 g Enterprise Edition Release 11.2.0.3.0 - 64 bit Production
PL/SQL Release 11.2.0.3.0 - Production
"CORE 11.2.0.3.0 Production."
AMT for Linux: Version 11.2.0.3.0 - Production
NLSRTL Version 11.2.0.3.0 - Production
Thank you. The function is not in the where clause but in the query using some of the returned columns. I realized that using the trace gave me the plan explanation of each of the functions.
-
Hi all
Can we please give me steps to query tunningSalvation;
Please see the link I shared in my previous post
Respect of
HELIOS -
Problem with the performance of a query tuning
Hello
I have a question which is in the below format
Select a.* from
(online query),
(inline query b)
where a.id = b.id;
Now I want the inline query b to be executed first, then joined with a.
How can I achieve the same.
Let me know if you need more information.
-
Can someone help me with this piece of the request that the request is to consume a lot of time. Maybe we can avoid selecting double. Can someone suggest an alternative?
SELECT sd.specification_sequence_no, sd.attribute_desc,
SD.specification_lov, sd.specification_code_table,
SD.specification_query, d.val
OF sa_spec_template_details sd,.
(SELECT l_chr_spec_desc01 dsc, l_chr_spec_val01 val
OF THE DOUBLE
UNION
SELECT l_chr_spec_desc02 dsc, l_chr_spec_val02 val
OF THE DOUBLE
UNION
SELECT l_chr_spec_desc03 dsc, l_chr_spec_val03 val
OF THE DOUBLE
UNION
SELECT l_chr_spec_desc04 dsc, l_chr_spec_val04 val
OF THE DOUBLE
UNION
SELECT l_chr_spec_desc05 dsc, l_chr_spec_val05 val
OF THE DOUBLE
UNION
SELECT l_chr_spec_desc06 dsc, l_chr_spec_val06 val
OF THE DOUBLE
UNION
SELECT l_chr_spec_desc07 dsc, l_chr_spec_val07 val
OF THE DOUBLE
UNION
SELECT l_chr_spec_desc08 dsc, l_chr_spec_val08 val
OF THE DOUBLE
UNION
SELECT l_chr_spec_desc09 dsc, l_chr_spec_val09 val
OF THE DOUBLE
UNION
SELECT l_chr_spec_desc10 dsc, l_chr_spec_val10 val
OF THE DOUBLE
UNION
SELECT l_chr_spec_desc11 dsc, l_chr_spec_val11 val
OF THE DOUBLE
UNION
SELECT l_chr_spec_desc12 dsc, l_chr_spec_val12 val
OF THE DOUBLE
UNION
SELECT l_chr_spec_desc13 dsc, l_chr_spec_val13 val
OF THE DOUBLE
UNION
SELECT l_chr_spec_desc14 dsc, l_chr_spec_val14 val
OF THE DOUBLE
UNION
SELECT l_chr_spec_desc15 dsc, l_chr_spec_val15 val
OF THE DOUBLE
UNION
SELECT l_chr_spec_desc16 dsc, l_chr_spec_val16 val
OF THE DOUBLE
UNION
SELECT l_chr_spec_desc17 dsc, l_chr_spec_val17 val
OF THE DOUBLE
UNION
SELECT l_chr_spec_desc18 dsc, l_chr_spec_val18 val
OF THE DOUBLE
UNION
SELECT l_chr_spec_desc19 dsc, l_chr_spec_val19 val
OF THE DOUBLE
UNION
SELECT l_chr_spec_desc20 dsc, l_chr_spec_val20 val
OF THE DOUBLE
UNION
SELECT l_chr_spec_desc21 dsc, l_chr_spec_val21 val
OF THE DOUBLE
UNION
SELECT l_chr_spec_desc22 dsc, l_chr_spec_val22 val
OF THE DOUBLE
UNION
SELECT l_chr_spec_desc23 dsc, l_chr_spec_val23 val
OF THE DOUBLE
UNION
SELECT l_chr_spec_desc24 dsc, l_chr_spec_val24 val
OF THE DOUBLE
UNION
SELECT l_chr_spec_desc25 dsc, l_chr_spec_val25 val
OF THE DOUBLE
UNION
SELECT l_chr_spec_desc26 dsc, l_chr_spec_val26 val
OF THE DOUBLE
UNION
SELECT l_chr_spec_desc27 dsc, l_chr_spec_val27 val
OF THE DOUBLE
UNION
SELECT l_chr_spec_desc28 dsc, l_chr_spec_val28 val
OF THE DOUBLE
UNION
SELECT l_chr_spec_desc29 dsc, l_chr_spec_val29 val
OF THE DOUBLE
UNION
SELECT l_chr_spec_desc30 dsc, l_chr_spec_val30 val
OF THE DOUBLE
UNION
SELECT l_chr_spec_desc31 dsc, l_chr_spec_val31 val
OF THE DOUBLE
UNION
SELECT l_chr_spec_desc32 dsc, l_chr_spec_val32 val
OF THE DOUBLE
UNION
SELECT l_chr_spec_desc33 dsc, l_chr_spec_val33 val
OF THE DOUBLE
UNION
SELECT l_chr_spec_desc34 dsc, l_chr_spec_val34 val
OF THE DOUBLE
UNION
SELECT l_chr_spec_desc35 dsc, l_chr_spec_val35 val
D FROM DUAL)
WHERE sd.plant = p_plant
AND sd.specification_type = p_specification_type
AND sd.specification_category = p_specification_category
AND sd.attribute_desc = d.dsc (+)
ORDER BY sd.specification_sequence_no; -
Hello
My DB is 9.2.0.8 and OS RHEl 4
his plan to explain isSELECT DISTINCT A.PSFF_CO_AGF_BDI,A.PSFF_IN_EX_FAC_DTL,A.PSFF_IN_ABO_RESERV A.PSFF_FX_INI_VIGENCIA , A.PSFF_FX_FIN_VIGENCIA , A.PGSC_CO_SCCO , A.AGFS_CO_CLIENTE ,B.CO_CUC_CABECERA FROM MNPSFFMO A , MNESTAAO B WHERE A.AGFS_CO_CLIENTE = B.CO_CUC_CLIENTE AND A.PSFF_CO_AGF_BDI in(select DISTINCT psqy_co_agf_bdi from mnpsqymo where psqy_co_agf_bdi is not null and PBPS_CO_HITO = 'MNHITO03' and PSQY_CO_ESTADO_EL_AGF in ('A', 'C')) AND B.CO_HITO = 'MNHITO03'
OPERATION Object Name Operation Cost Select statement 163 sort unique 163 hash join 139 table access MNESTAAO full 4 merge join 134 table access MNPSFFMO by index rowid 53 index INDEX4 full scan 26 sort join 81 table access MNPSQYMO by index rowid 72 index INDEX10 full scan 26Hello
first read this:
http://www.morganslibrary.org/reference/tuning.htmland then consider your options.
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Hi all... I am in the process of update query. I go through the explain plan... command and it shows a comprehensive in 3 places even when the indexes are available. could you help me with the setting of the query. Also I'd like to understand how to map the query with the query plan that is to say
where can I find ID = 13 in the query?
Query
SELECT
usr. USR_ID,
Prod.prod_type_nm,
Prod.prod_cd,
Prod.prod_fam_cd,
Prod.prod_full_nm,
Prod.prod_shrt_nm,
Prod.product_hierarchy,
pvlg.pvlg_nm,
pvlg.pvlg_cd,
pvlg.pvlg_val_tx
FROM (SELECT DISTINCT usr_id, pvlg_dim_nb)
Of usr_xref, usr_dim, hds_fct
WHERE usr_xref.sys_id = 'ACCESS '.
AND usr_xref.usr_dim_nb = usr_dim.usr_dim_nb
AND usr_dim.usr_dim_nb = hds_fct.usr_dim_nb
AND hds_fct.pvlg_dim_nb <>0
AND hds_fct.prod_dim_nb <>0
AND hds_fct.cust_dim_nb <>0
AND hds_fct.acct_dim_nb = 0) usr.
FCST pvlg_dim,
(SELECT prod_dim_nb, prod_type_nm, prod_fam_cd, prod_cd,
prod_shrt_nm, prod_full_nm,
LTRIM (SYS_CONNECT_BY_PATH (prod_cd, ' / '),)
'/'
) product_hierarchy
OF prod_dim
WHERE prod_fam_cd = 'ATS '.
START WITH prod_dim_nb = prnt_prod_dim_nb
CONNECT BY NOCYCLE prnt_prod_dim_nb = PRIOR prod_dim_nb) prod
WHERE usr.pvlg_dim_nb = pvlg.pvlg_dim_nb
AND pvlg.prod_dim_nb = prod.prod_dim_nb;
PLAN_TABLE_OUTPUT
Hash value of plan: 3351127065
-------------------------------------------------------------------------------------------------
| ID | Operation | Name | Lines | Bytes | Cost (% CPU). Time |
-------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | 7. 15582 | 55 (6) | 00:00:01 |
|* 1 | HASH JOIN | 7. 15582 | 55 (6) | 00:00:01 |
|* 2 | HASH JOIN | 53. 6572. 52 (4) | 00:00:01 |
| 3. VIEW | 53. 1325 | 44 (5) | 00:00:01 |
| 4. UNIQUE HASH | 53. 2332 | 44 (5) | 00:00:01 |
|* 5 | HASH JOIN | 53. 2332 | 43 (3) | 00:00:01 |
|* 6 | TABLE ACCESS BY INDEX ROWID | HDS_FCT | 53. 1007 | 8 (0) | 00:00:01 |
|* 7 | INDEX RANGE SCAN | HDS_FCT_FK3 | 55. 3 (0) | 00:00:01 |
|* 8 | TABLE ACCESS FULL | USR_XREF | 346. 8650 | 34 (0) | 00:00:01 |
| 9. TABLE ACCESS FULL | PVLG_DIM | 916. 90684 | 8 (0) | 00:00:01 |
| 10. VIEW | 3. 6306 | 2 (0) | 00:00:01 |
| * 11 | FILTER |
| * 12 | CONNECT BY WITH FILTERING |
| * 13 | TABLE ACCESS FULL | PROD_DIM | 1. 73. 3 (0) | 00:00:01 |
| 14. NESTED LOOPS |
| 15. CONNECT PUMP |
| 16. TABLE ACCESS BY INDEX ROWID | PROD_DIM | 3. 219. 2 (0) | 00:00:01 |
| * 17. INDEX RANGE SCAN | PROD_DIM_FK2 | 3 | | 1 (0) | 00:00:01 |
-------------------------------------------------------------------------------------------------
Information of predicates (identified by the operation identity card):
---------------------------------------------------
1 - access("PVLG".") PROD_DIM_NB "=" PROD ". ("' PROD_DIM_NB")
2 - access("USR".") PVLG_DIM_NB "=" FCST. ("' PVLG_DIM_NB")
5 - access("HDS_FCT".") USR_DIM_NB "=" USR_XREF. " ("' USR_DIM_NB")
6 - filter("HDS_FCT".") PROD_DIM_NB' <>0 AND 'HDS_FCT '. "' PVLG_DIM_NB ' <>0 AND
'HDS_FCT '. ("' CUST_DIM_NB ' <>0)
7 - access("HDS_FCT".") ACCT_DIM_NB "= 0)
8 - filter("USR_XREF".") SYS_IDS "=" ACCESS")
11 - filter ("PROD_FAM_CD" = 'ATS')
12 - access ("PRNT_PROD_DIM_NB" = "PROD_DIM_NB" PRIOR)
13 - filter ("PROD_DIM_NB" ="PRNT_PROD_DIM_NB")
17 - access ("PRNT_PROD_DIM_NB" = "PROD_DIM_NB" PRIOR)
Concerning
REDANo, it's still not right. Please top and tail of your example with {code}
Cheers, APC
blog: http://radiofreetooting.blogspot.com
-
How to check the performance of query via the command sqlplus prompt
Hello
I work in the production environment, I want to check the performance of the queries in a production environment, we have no specific tools such as the expliin plan, TK Proff.
I need chek performnce of sqlplus command line query
Please let me know the process of query tuning of sqlplus command promtHere to explain plan:
SQL> explain plan for 2 select * from employees where employee_id = 170; Explained. SQL> select * from table(dbms_xplan.display()); PLAN_TABLE_OUTPUT ----------------------------------------------------------------------------------------------- Plan hash value: 1833546154 --------------------------------------------------------------------------------------------- | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | --------------------------------------------------------------------------------------------- | 0 | SELECT STATEMENT | | 1 | 69 | 1 (0)| 00:00:01 | | 1 | TABLE ACCESS BY INDEX ROWID| EMPLOYEES | 1 | 69 | 1 (0)| 00:00:01 | |* 2 | INDEX UNIQUE SCAN | EMP_EMP_ID_PK | 1 | | 0 (0)| 00:00:01 | --------------------------------------------------------------------------------------------- Predicate Information (identified by operation id): --------------------------------------------------- 2 - access("EMPLOYEE_ID"=170)You can also use autotrace, which is super easy:
SQL> set autotrace on SQL> select * from emp; EMPNO ENAME JOB MGR HIREDATE -------------------- ---------- --------- -------------------- -------------------- 7369 SMITH CLERK 7902 17-DEC-1980 00:00:00 7499 ALLEN SALESMAN 7698 20-FEB-1981 00:00:00 7521 WARD SALESMAN 7698 22-FEB-1981 00:00:00 7566 JONES MANAGER 7839 02-APR-1981 00:00:00 7654 MARTIN SALESMAN 7698 28-SEP-1981 00:00:00 7698 BLAKE MANAGER 7839 01-MAY-1981 00:00:00 7782 CLARK MANAGER 7839 09-JUN-1981 00:00:00 7788 SCOTT ANALYST 7566 19-APR-1987 00:00:00 7839 KING PRESIDENT 17-NOV-1981 00:00:00 7844 TURNER SALESMAN 7698 08-SEP-1981 00:00:00 7876 ADAMS CLERK 7788 23-MAY-1987 00:00:00 7900 JAMES CLERK 7698 03-DEC-1981 00:00:00 7902 FORD ANALYST 7566 03-DEC-1981 00:00:00 7934 MILLER CLERK 7782 23-JAN-1982 00:00:00 14 rows selected. Execution Plan ---------------------------------------------------------- Plan hash value: 3956160932 -------------------------------------------------------------------------- | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | -------------------------------------------------------------------------- | 0 | SELECT STATEMENT | | 14 | 532 | 3 (0)| 00:00:01 | | 1 | TABLE ACCESS FULL| EMP | 14 | 532 | 3 (0)| 00:00:01 | -------------------------------------------------------------------------- Statistics ---------------------------------------------------------- 480 recursive calls 0 db block gets 92 consistent gets 9 physical reads 0 redo size 1630 bytes sent via SQL*Net to client 520 bytes received via SQL*Net from client 2 SQL*Net roundtrips to/from client 7 sorts (memory) 0 sorts (disk) 14 rows processedThis guide has lots of good info:
http://docs.Oracle.com/CD/B19306_01/server.102/b14211/TOC.htm -
Hi guys,.
I searched a lot on the "query block" on google, but dosent find any satisfactory article that will explain basic concept to me.
I would like to know about the parameter query block that we specified when using indicators of query optimization in oracle.
How can they be used? where we can find them?
any suggestions?
Thanks and greetings
VDVkrant,
You did exactly the same thing that is asked of me all the time. What is the purpose of this indication in a simple query that I have to show you all the time. The answer is nothing, makes complex things however. But but but, in a very complex query, where there is a cross reference of the sections of different query is required, this trick will be useful to give a name to the underlying query.
>
Select / * + dept_id full (@qb d) QB_NAME (qb)
of db.dept d;can we say its just alias?
>
Yes, any. Give an official name to the query. In this query, Department table will be available with FTS.
HTH
Aman...
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