Help to explain the plan - 11 GR 2
11 GR 2, windowsAn AWR reports. the following sql code is under 'SQL sort by elapsed time.
Select * from rator. History where account_id =: 'SYS_B_0' and create_date BETWEEN to_date (: "SYS_B_1,": "SYS_B_2")
AND to_date(:"SYS_B_3",:"SYS_B_4") +: «SYS_B_5» ORDER BY create_date desc;)
I have an index on the columns ID and create_date.
When I tried to get the plan of auotrace set traceonly, its application to bind the values of the variables. How to get plan for this sql and can change the plan by providing advice. ?
Thank you
Hello
Use dbms_xplan.display_awr to produce the plan of the explain command.
Best regards
Nikolai
Tags: Database
Similar Questions
-
Explain the plans differ as the parameter value changes
Hi all
My colleague posted a similar question a few days before. Happened because of some bad index. But now we are in a strange situation.
DB:
We use the query below and was working fine until 13.SQL> select * from v$version; BANNER ---------------------------------------------------------------- Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Prod PL/SQL Release 10.2.0.1.0 - Production CORE 10.2.0.1.0 Production TNS for 32-bit Windows: Version 10.2.0.1.0 - Production NLSRTL Version 10.2.0.1.0 - Production
It shows a hash join and nested with cost 16963 loops and gives the result in 2-3 seconds. It gives the same plan to explain even now if we use batch_id = '130609'SQL> explain plan for 2 SELECT * 3 FROM gacc_dtl_v1 acc, 4 gcus_dtl_v1 cus, 5 gtxn_dtl_v1 txn 6 WHERE txn.customer_id = cus.customer_number(+) 7 AND txn.batch_id = cus.batch_id(+) 8 AND txn.account_number = acc.id 9 AND acc.batch_id = '130609' 10 AND cus.batch_id(+) = '130609' 11 AND txn.batch_id = '130609' AND cus.target IN ('30'); Explained. SQL> select * from table(dbms_xplan.display); PLAN_TABLE_OUTPUT ------------------------------------------------------------------------------------------------------------- Plan hash value: 566819363 ------------------------------------------------------------------------------------------------------------- | Id | Operation | Name | Rows | Bytes |TempSpc| Cost (%CPU)| Time | ------------------------------------------------------------------------------------------------------------- | 0 | SELECT STATEMENT | | 1 | 947 | | 16963 (1)| 00:03:24 | | 1 | NESTED LOOPS | | 1 | 947 | | 16963 (1)| 00:03:24 | |* 2 | HASH JOIN | | 41 | 26322 | 9136K| 16799 (1)| 00:03:22 | |* 3 | TABLE ACCESS BY INDEX ROWID| GTXN_DTL_V1 | 31055 | 8764K| | 2430 (1)| 00:00:30 | |* 4 | INDEX RANGE SCAN | GTXN_V1_BATCHID_NDX | 60524 | | | 156 (2)| 00:00:02 | |* 5 | TABLE ACCESS BY INDEX ROWID| GCUS_DTL_V1 | 176K| 59M| | 10869 (1)| 00:02:11 | |* 6 | INDEX RANGE SCAN | IDX_CUS2_V1 | 198K| | | 527 (2)| 00:00:07 | | 7 | TABLE ACCESS BY INDEX ROWID | GACC_DTL_V1 | 1 | 305 | | 4 (0)| 00:00:01 | |* 8 | INDEX RANGE SCAN | GACC_DTL_V1_IDX | 1 | | | 3 (0)| 00:00:01 | ------------------------------------------------------------------------------------------------------------- Predicate Information (identified by operation id): --------------------------------------------------- 2 - access("TXN"."CUSTOMER_ID"="CUS"."CUSTOMER_NUMBER" AND "TXN"."BATCH_ID"="CUS"."BATCH_ID") 3 - filter("TXN"."CUSTOMER_ID" IS NOT NULL) 4 - access("TXN"."BATCH_ID"='130609') 5 - filter("CUS"."TARGET"='30') 6 - access("CUS"."BATCH_ID"='130609') 8 - access("TXN"."ACCOUNT_NUMBER"="ACC"."ID" AND "ACC"."BATCH_ID"='130609') filter(SUBSTR("TXN"."ACCOUNT_NUMBER",1,3)=SUBSTR("ACC"."ID",1,3)) 26 rows selected.
Now all of a sudden from yesterday it gives different explain the plan below. Only difference in the query below is the value of batch_id
It shows two loops nested with cost 77, but works for hours. Very very slow.. No idea what's going on...SQL> explain plan for 2 SELECT * 3 FROM gacc_dtl_v1 acc, 4 gcus_dtl_v1 cus, 5 gtxn_dtl_v1 txn 6 WHERE txn.customer_id = cus.customer_number(+) 7 AND txn.batch_id = cus.batch_id(+) 8 AND txn.account_number = acc.id 9 AND acc.batch_id = '150609' 10 AND cus.batch_id(+) = '150609' 11 AND txn.batch_id = '150609' AND cus.target IN ('30'); Explained. SQL> select * from table(dbms_xplan.display); PLAN_TABLE_OUTPUT ------------------------------------------------------------------------------------------------------------ Plan hash value: 773603995 -------------------------------------------------------------------------------------------------------- | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | -------------------------------------------------------------------------------------------------------- | 0 | SELECT STATEMENT | | 1 | 947 | 77 (0)| 00:00:01 | | 1 | NESTED LOOPS | | 1 | 947 | 77 (0)| 00:00:01 | | 2 | NESTED LOOPS | | 1 | 594 | 73 (0)| 00:00:01 | | 3 | TABLE ACCESS BY INDEX ROWID| GACC_DTL_V1 | 1 | 305 | 4 (0)| 00:00:01 | |* 4 | INDEX RANGE SCAN | GACC_DTL_BATCH_ID_INDX | 1 | | 3 (0)| 00:00:01 | |* 5 | TABLE ACCESS BY INDEX ROWID| GTXN_DTL_V1 | 1 | 289 | 69 (0)| 00:00:01 | |* 6 | INDEX RANGE SCAN | IDX_TXN2_V1 | 125 | | 12 (0)| 00:00:01 | |* 7 | TABLE ACCESS BY INDEX ROWID | GCUS_DTL_V1 | 1 | 353 | 4 (0)| 00:00:01 | |* 8 | INDEX RANGE SCAN | IDX_CUS3_V1 | 1 | | 3 (0)| 00:00:01 | -------------------------------------------------------------------------------------------------------- Predicate Information (identified by operation id): --------------------------------------------------- 4 - access("ACC"."BATCH_ID"='150609') 5 - filter("TXN"."CUSTOMER_ID" IS NOT NULL AND "TXN"."BATCH_ID"='150609') 6 - access("TXN"."ACCOUNT_NUMBER"="ACC"."ID") filter(SUBSTR("TXN"."ACCOUNT_NUMBER",1,3)=SUBSTR("ACC"."ID",1,3)) 7 - filter("CUS"."TARGET"='30') 8 - access("CUS"."BATCH_ID"='150609' AND "TXN"."CUSTOMER_ID"="CUS"."CUSTOMER_NUMBER") filter("TXN"."BATCH_ID"="CUS"."BATCH_ID") 26 rows selected.
We are also do not understand why the filter (SUBSTR ("TXN". ""»(, 1, 3) ACCOUNT_NUMBER = SUBSTR ("VAC". " ID", 1, 3)) is used in both queries.select i.table_name,i.index_name,index_type,c.column_name,c.column_position,e.column_expression from all_indexes i, all_ind_columns c,all_ind_expressions e where c.index_name = i.index_name and e.index_name(+) = i.index_name and i.table_name in ('GCUS_DTL_V1','GACC_DTL_V1','GTXN_DTL_V') order by 1,2,4 TABLE_NAME INDEX_NAME INDEX_TYPE COLUMN_NAME COLUMN_POSITION COLUMN_EXPRESSION -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- GACC_DTL_V1 GACC_DTL_BATCH_ID_INDX NORMAL BATCH_ID 1 GACC_DTL_V1 GACC_DTL_V1_IDX NORMAL BATCH_ID 2 GACC_DTL_V1 GACC_DTL_V1_IDX NORMAL ID 1 GACC_DTL_V1 GACC_DTL_V1_IDX2 FUNCTION-BASED NORMAL SYS_NC00101$ 1 SUBSTR("ID",1,3) GACC_DTL_V1 IDX_ACC1_V1 NORMAL CATEGORY 1 GACC_DTL_V1 IDX_ACC3_V1 FUNCTION-BASED NORMAL SYS_NC00099$ 1 "CUSTOMER_NUMBER"||'.'||"LIMIT_REF" GACC_DTL_V1 IDX_ACC4_V1 FUNCTION-BASED NORMAL SYS_NC00100$ 1 "CUSTOMER_NUMBER"||'.000'||"LIMIT_REF" GACC_DTL_V1 IDX_ACC5_V1 NORMAL POSTING_RESTRICT 1 GACC_DTL_V1 IDX_CUS5_V1 NORMAL CUSTOMER_NUMBER 1 GACC_DTL_V1 IDX_CUS6_V1 NORMAL LIMIT_REF 1 GCUS_DTL_V1 GCUS_DTL_V1_IDX1 NORMAL CUSTOMER_NUMBER 1 GCUS_DTL_V1 IDX_CUS2_V1 NORMAL BATCH_ID 1 GCUS_DTL_V1 IDX_CUS3_V1 NORMAL BATCH_ID 1 GCUS_DTL_V1 IDX_CUS3_V1 NORMAL CUSTOMER_NUMBER 2 GCUS_DTL_V1 IDX_CUS3_V1 NORMAL INDUSTRY 4 GCUS_DTL_V1 IDX_CUS3_V1 NORMAL SECTOR 3 GCUS_DTL_V1 IDX_CUS4_V1 FUNCTION-BASED NORMAL SYS_NC00078$ 1 SUBSTR("DATE_STAMP",1,6)
All tables are analyzed today.
Please share your thoughts on this.
Thanks in advance,
JacJac says:
L H NUM_BUCKETS LAST_ANALYZED SAMPLE_SIZE HISTOGRAM ------------------------------------------------------------------------------------------------------------------------------------------------ 010109 311208 235 13/Jun/2009 5,343 FREQUENCYYou have a histogram of frequencies on the BATCH_ID column missing at least 2 values according to your index statistics (235 buckets vs 237 separate keys).
If the value that you use in the query is missing then this could be the explanation for the estimation of cardinality bad (since you're on pre - 10.2.0.4. In 10.2.0.4 that this behavior changes).
The size of the sample of 5 300 lines is also very low, given the 57,000,000 lines according to the index statistics.
You have two options (which can be combined):
-Increase the size of the sample using a parameter explicitly estimate_percent, for example at least 10 percent
exec DBMS_STATS. GATHER_TABLE_STATS (null, 'GACC_DTL_V1', estimate_percent-online 10, method_opt => 'FOR COLUMNS SIZE 254 BATCH_ID,' waterfall-online fake)
-Get rid of the histogram
exec DBMS_STATS. GATHER_TABLE_STATS (null, 'GACC_DTL_V1', method_opt-online 'FOR BATCH_ID COLUMNS SIZE 1', cascade-online fake)
Note: Is there a particular reason why you store numbers in varchar columns? This might be the reason why Oracle believes that it must generate a histogram using the AUTO SIZE option.
I tend to promote to remove from the histogram, but you must first verify the data if the BATCH_ID values are spread out and the histogram is reasonable:
select batch_id , count(*) from gacc_dtl_v1 group by batch_id;No constarints are at the DB level. All are processed Application level.
Have you checked this in DBA/ALL/USER_CONSTRAINTS?
It's also a good idea to have constraints at the level of the DB. It keeps your data consistent and quite often helps the optimizer. It allows even 10.2 and later to make things like the elimination of a join table that can make a huge difference in performance.
Kind regards
RandolfOracle related blog stuff:
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/Published by: Randolf Geist on June 16, 2009 11:48
Comment added constraints
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a sql id have more than explain the plan so I'd like to come up with plan used at runtime.
Hi all
In a sql oracle11g having id several explain the plan so I'd like to come up with plan used at runtime.
For example SQlID:-8yczg5zav14vt have 5 sql plan and I want to check that we execute at any time, please let me how I can check by sql queries
Concerning
Ranjeet
RanjeetSohale wrote:
I am ok for that but active only plans is right, but in accordance with the foregoing, two data line table in the table SQL V$ so both active and plan cost is high and the other is low.
Yes that's right cost is different, he means here another effective plan for oracle will analyze the declaration again and stored as new slider of the child. Especially since I explained that.
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Hello world
could someone please provide me with details of explained the plan and I would appreciate some related details explain plan, trace and tkprof
Thank you
ShareefHello
PLAN of EXPLAINING is an Oracle utility that analyzes a statement and shows the expected execution plan. It may be different from the implementation plan real for a number of reasons.
Extended SQL trace (10046 event) is a way to gather advanced diagnostic information. There are different levels, at levels 8 and 12 provide the greatest level of detail (you will be able to see the events of waiting and the bind variable values).
TKProf is a utility that processes the raw trace files and makes shaped the output in a more readable way. However, some experts prefer to work with trace files "gross" - they are not so difficult to read, especially if you get some practice.
There are other events of tracing: 10053 allows you to see what is happening inside the Oracle optimizer, 10104 allows to see the stats of hash etc join.
Best regards
Nikolai -
difference between the execution plan and explain the plan?
What is the difference between the execution plan & explain the plan?an execution plan is the actual steps that oracle will pass by when it executes a query.
explain plan is a tool that is used to generate the steps of an execution plan for a query.
-
explain the plan against the eve...
I have a DDL which takes a long time to run on the primary
would like to know how long it takes if I switch to sleep mode and run education instead of the primary current standby... is possible to run explain sleep agasint plan without having to go through the whole process of switch?
I tried but the statement explain plan is a failure... Statement requires write Victorian for table plan and may not write in the plan table because db is not open... :) perhapts a new feature to implement in oracle 12g? :)
:)
v11.2.0.2
physical standbybe nice if we could run explains the plan for the system of relief through the primary system :) maybe in 12g?
do not know now. :)
-
Generation to EXPLAIN the PLAN on a database that is open in READ ONLY mode
Hello
I use the Oracle 10.2.0.3 version.
If my database is opened in READ ONLY mode, means that no insert/update/delete operations are allowed here.
During the generation of the PLAN to EXPLAIN this, the PLAN_TABLE registrations for any SQL. But my database is opened in READ ONLY mode, means that no inserts can happen.
So, how can I generate EXPLAIN PLAN for my SQL in this State?
Thanks in advance.
Best regards
oratestoratest wrote:
I use the Oracle 10.2.0.3 version.If my database is opened in READ ONLY mode, means that no insert/update/delete operations are allowed here.
During the generation of the PLAN to EXPLAIN this, the PLAN_TABLE registrations for any SQL. But my database is opened in READ ONLY mode, means that no inserts can happen.
So, how can I generate EXPLAIN PLAN for my SQL in this State?
You can always do: 'explain the plan in some_table@remote_database' to avoid inclusion in the local database. Unfortunately 10g added an extraction of the sequence of the code "explain plan", and that's where the call fails if you have tried this distant approach on your version.
Here's an idea that I have not tested. If you configure a link of data to your database from production to the database read-only, you could then do a "explain plan" in the database of production for the SQL statement by changing each object reference in the SQL statement to "object@readonlydatabase". In most cases this will allow the optimizer to recognize the statement as "entirely to distance" and get the optimizer on the readonly database to create the execution plan - which will be then written into the production database.
Concerning
Jonathan Lewis -
why sometimes the trace file does not explain the plan?
Hello
Sometimes, when I 'alter session set sql_trace = true' and run some querys, some of them don't see explained the plan in the trace file?
I tried "alter system RAS shared_pool" before starting the trace, but not luck.
(Oracle 10g R2)
any ideas?
Thnks
Miguel
Published by: jmmnunes on Apr 27, 2010 18:01some of them don't watch not explain the plan in the trace file?
Log out of your session after you set the trace sql false?
All cursors must be closed to have access to all the information from the row source in the trace file.
-
explain the plan of a query with variables
Trying to Explain plan at some sql code in sql * more. The query has a variable. How can I do this?
I look to explain the plan and dbms_xplan but did not find anything with variablesuse sqlplus variable bind:
SQL> --define variable SQL> var x varchar2 SQL> -- notice the colon prefixing the variable SQL> explain plan for select * from customer where cid = :x; Explained. SQL> select * from table( dbms_xplan.display ); PLAN_TABLE_OUTPUT ----------------------------------------------------------------------------------------------- Plan hash value: 1709312366 ---------------------------------------------------------------------------------------- | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | ---------------------------------------------------------------------------------------- | 0 | SELECT STATEMENT | | 1 | 67 | 2 (0)| 00:00:01 | | 1 | TABLE ACCESS BY INDEX ROWID| CUSTOMER | 1 | 67 | 2 (0)| 00:00:01 | |* 2 | INDEX RANGE SCAN | CID | 1 | | 1 (0)| 00:00:01 | ---------------------------------------------------------------------------------------- Predicate Information (identified by operation id): --------------------------------------------------- 2 - access("CID"=:X) 14 rows selected.the variable should not be set to explain the request, because explain does not actually run.
Published by: shoblock on November 6, 2008 16:51
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Help to understand the plan of the explain command
Hello world
I have a question:
INSERT INTO ICM_UPSEL_1_ALL
Select a.customer_no, a.pr_code_bbl, pr_code_pmm, a.score, a.price_diff, a.flag (b.pr_code_pmm) min
ICM_UPSEL_MIN_PRDIFF_1 a, icm_pre b
where a.customer_no = b.customer_no
and a.pr_code_bbl = b.pr_code_bbl
and a.score = b.score
and a.flag = b.flag
and a.price_diff = b.price_diff
and b.price_diff > 0
and b.score > = 0.5
and b.flag = 1
and b.price_diff > 0 and b.price_diff < = 10
Group of a.customer_no, a.pr_code_bbl, a.score, a.price_diff, a.flag
This query runs in a pl/sql procedure. The plan of the explain for this query command is:
Hash value of plan: 3124235498
------------------------------------------------------------------------------------------------------------------
| ID | Operation | Name | Lines | Bytes | Cost (% CPU). Time |
------------------------------------------------------------------------------------------------------------------
| 0 | INSERT STATEMENT. | 1. 143. 4 (25) | 00:00:01 |
| 1. LOAD TABLE CLASSIC | ICM_UPSEL_1_ALL | | | | |
| 2. HASH GROUP BY. | 1. 143. 4 (25) | 00:00:01 |
| 3. NESTED LOOPS | | | | | |
| 4. NESTED LOOPS | | 1. 143. 3 (0) | 00:00:01 |
|* 5 | TABLE ACCESS BY INDEX ROWID | ICM_UPSEL_MIN_PRDIFF_1 | 1. 65. 1 (0) | 00:00:01 |
|* 6 | INDEX RANGE SCAN | MPD_1_FLAG_IDX | 1. | 1 (0) | 00:00:01 |
|* 7 | INDEX RANGE SCAN | ICM_PRE_FLAG_IDX | 1. | 2 (0) | 00:00:01 |
|* 8 | TABLE ACCESS BY INDEX ROWID | ICM_PRE | 1. 78. 2 (0) | 00:00:01 |
------------------------------------------------------------------------------------------------------------------
Information of predicates (identified by the operation identity card):
---------------------------------------------------
5 - filter("A".") PRICE_DIFF"> 0 AND 'A '. "SCORE" > = 0.5 AND 'A' "." " (PRICE_DIFF"< = 10)
6 - access("A".") FLAG "= 1)
7 - access("B".") FLAG "= 1)
8 - filter("B".") PRICE_DIFF"< = 10 AND 'B '. "SCORE" > = 0.5 AND 'B' "." " PRICE_DIFF"> 0 AND
"A"." CUSTOMER_NO '=' B '. "' CUSTOMER_NO ' AND 'A '. "" PR_CODE_BBL "=" B ". "' PR_CODE_BBL ' AND 'A '. "SCORE" = 'B' "." " SCORE '.
AND 'A '. "" PRICE_DIFF "=" B ". ("' PRICE_DIFF")
This query runs for 10 hours now and still no results. Could someone please help me where goes wrong... Why is - it take as long to insert data...
The number of rows in ICM_UPSEL_MIN_PRDIFF_1: 84 858
The number of rows in icm_pre: 455,500,944
All columns are indexed.
My version of the database is 11.1.0.6 running on windows server 2003 R2.
Thanks in advance
This plan seems much more suitable for me: instead of doing > 80 K of the loops of the CBO now decides to make a unique HASH JOIN. I would try to run the operation with the dynamic_sampling flag. If the system statistics are not completely misleading the operation now only takes a few minutes (and no 10: 00 >).
Concerning
Martin
-
Question about cardinality (lines) to explain the plan
I have two tables (names have been changed to protect the innocent):
TABLE 1:
The Null columns? Type
-------------------- -------- ----------------------------------------------
Table1_Primary_Key NOT NULL NUMBER
more than 10 columns
TABLE2:
The Null columns? Type
-------------------- -------- ----------------------------------------------
Table2_Primary_Key NOT NULL NUMBER
more than 8 columns
Lines of table1 has 1097172
Rows of table2 has 160960
I am analysis request and get explain below:
SELECT t1. Table1_Primary_Key
--
FROM TABLE1 t1,
From TABLE2 T2
--
WHERE t1. Table1_Primary_Key = t1. Table1_Primary_Key
AND t2. Table2_Primary_Key = 3432798
/
------------------------------------------------------------------------------------------------
| ID | Operation | Name | Lines | Bytes | Cost (% CPU). Time |
------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1. 21. 5 (0) | 00:00:01 |
| 1. NESTED LOOPS | | 1. 21. 5 (0) | 00:00:01 |
| 2. TABLE ACCESS BY INDEX ROWID | TABLE2. 1. 12. 3 (0) | 00:00:01 |
|* 3 | INDEX UNIQUE SCAN | TABLE2_PK | 1. | 2 (0) | 00:00:01 |
| 4. TABLE ACCESS BY INDEX ROWID | TABLE1. 1096K | 9634K | 2 (0) | 00:00:01 |
|* 5 | INDEX UNIQUE SCAN | TABLE1_PK | 1. | 1 (0) | 00:00:01 |
------------------------------------------------------------------------------------------------
As you can see it table2 is exactly 1 row and join table1 on a correspondence of single line.
My question is this:
Why the plan of the explain command seems (at least for me) to indicate that it looked like all the rows in TABLE1?
Thank you
Thomas
the optimizer's decisions are based on the object (and maybe system) statistics: so it's a good idea to provide as much information as possible in these statistics. Basically, there is nothing wrong with statistics automatic collection job - so I would count on that if I don't have very good reason to use anything else. Of course, there are some situations in which it's a good idea to add a few adjustions for automatic collection: sometimes, there is too much created histograms, sometimes there is too little (basically you have histograms when the distribution of the data is not yet). And if there are columns with correlated values who serve together in boundary conditions then create extensive statistics may be a good idea. To make these adjustions, you can use the routines of pref dbms_stats. And sometimes, it may even be a good idea is not to collect statistics for an object and use the sample dynamic (dynamic statistics) for more detailed information on the cardinality of distribution and join.
In the book of my opinion Jonathan Lewis cost base Oracle Fundamentals still contains the best explanation of the use of optimizer statistics - and Christian Antognini Oracle performance troubleshooting also provides a lot of valuable information about statistics and their gathering. Of course the documentation also explains the basics in detail: Managing optimizer statistics - 11 g Release 2 (11.2). And if you want to get a shorter summary, then you can always take a look at the Web of Tim Hall site: https://oracle-base.com/articles/misc/cost-based-optimizer-and-database-statistics.
-
explain the plan using plan_hash_value and runtime
Hello
Please let me know the syntax to get the plan to explain using sql_id and plan_hash_value.
Also let me know how to find out the same sql execution times in the previous months. I have the ID value of sql.
Kind regards
VN
> Is it possible to check how long the sql finished in the previous months?
Of AWR / StatsPack reports.
Or use awrsqrpt.sql which can query the repository for a single SQL_ID AWR.
However, you must have the AWR data kept for 4 months. The default retention is 7 days.
Hemant K Collette
-
Explain the Plan of DBA_HIST_SQL_PLAN
Hello
I have the SQL_ID of a poor performing stmt of sql and I need to get the plan to explain the same DBA_HIST_SQL_PLAN.
Please let me how can know I generate an explain plan of DBA_HIST_SQL_PLAN using sql_id.
Kind regards
VN
That's fine - the service is available in this version. (I asked because I thought that might be a function g 11 - but I just checked, and it's in 10 gr 2 as well).
Concerning
Jonathan Lewis
-
Hi Experts,
I had a doubt about the Plan to explain it.
Is there a relationship between the cost amount in the Plan to explain and the number of lines read by the query?
In other words - if the number of lines read by the query increases, which will increase the cost also?
Can someone please give me some advice on this?
Thank you and best regards,
Vanessa B.ranitB wrote:
Hi Experts,I had a doubt about the Plan to explain it.
Is there a relationship between the cost amount in the Plan to explain and the number of lines read by the query?
In other words - if the number of lines read by the query increases, which will increase the cost also?Can someone please give me some advice on this?
"The answer is 'not really' the cost is single block read disc of research time. But if the number of lines that are expected + coming in overall result are higher, the work expected by Oracle would be also higher. Thus, indirectly, the answer may be Yes. That said, the number of rows contained in the plan of the explain command (you should check the execution plan, explain plan is not the real plan) are the lines that the optimizer is expected to pick up and extracted from the number ofrows real may or may not match with her.
Aman...
-
Explain the plan of a function?
Hi people;
I am running Oracle 11 g 11.2.0.3.
Is it possible to get the plan of "explaining" execution of a function?
Thx for your knowledge, looks.Hello
dbms_profiler is really simple, it does not really require a tutorial.
dbms_profiler.start_profiler;dbms_profiler.stop_profiler; That's all. The only thing that can take you a bit is the display of the results
tables of % plsql_. Google will give you many links to examples, for example this one:http://www.toadworld.com/knowledge/KnowledgeXpertforOracle/tabid/648/TopicId/PROF7/default.aspx
Best regards
Nikolai
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