explain the plan against the eve...
I have a DDL which takes a long time to run on the primarywould 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 standby
be nice if we could run explains the plan for the system of relief through the primary system :) maybe in 12g?
do not know now. :)
Tags: Database
Similar Questions
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Explain the changes of one schema to another Plan.
We find that the explain command plan changes when a query is executed in a schema as oppsed to another.
What could be the reasons?
As Marwim said, you posted in the wrong forum. Please find the right forum for your product and ask there.
If you want to know how to work with the forum, you can visit the commissioning group.
Locking this thread. It will be deleted in the near future.
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decide to move to optimization soon. Book says join faster that the subquery in this example because the analyses involved. The "cost" to the subquery appears lower than the cost for the join. So it is confusing to me - aka How should I be interpreting this.
Plan of subquery:
join plan
as you can see that the plan for the subquery has less than a cost. Could someone explain these outputs as to which application is more effective. I need to start somewhere.
Thank you!
The BEST way to get help when you ask questions is:
1 ask questions on SPECIFIC things
2. tell us EXACTLY what term, value, etc. ask abaout
Book says join faster that the subquery in this example because the analyses involved. The "cost" to the subquery appears lower than the cost for the join. So it is confusing to me - aka How should I be interpreting this.
OK - what BOOK are you talking about? There is not much interest to mention a book if you're not going to tell us which book it and provide a link to it and even a page number. This gives us the SCOPE of your question.
This "cost for the subquery" are you talking about? Be specifc. It is in one of the plans that you posted? What plan? Whose cost is it? For example, you could say:
I have a question for the foreground below. Why is the cost to the xx line lower than the cost of the second plan on line AA?
This question refers CLEARLY to the info we're talking. The way in which you stating the question, we try to guess what plan and the lines you want to say.
subquery plan:
join plan
as you can see the subquery plan has less of a cost. Could someone explain from these outputs as to which query is more efficient. I need to start from somewhere.
Are you talking about line #1 in each of these plans?
Please edit your post and tell us EXACTLY what you ask in the topic and refer to values and SPECIFIC lines. Also post a link to the book and a reference to a page number you got the information from.
The optimizer generally chooses the REAL implementation with the lowest cost plan. It is not clear whether the plans that you have posted are ACTUAL spending plans that Oracle really determined and used or just explain plans.for what Oracle thought it might use.
If the statistics are not up-to-date these plans do not yet reflect the reality of the data.
And if the amount of data is a small number of blocks or other of these plans can run better than the other in reality.
You can find this Oracle white paper "Explain the Plan explaining" useful
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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.
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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
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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.
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Hi all
I have a SQL query that joined with temporary tables total and normal tables.
I created indexes on global temporary tables with the column that is used
in where condition.
But when I check the explain command plan I see this full table access with cost like 2.
This full table access is child of nested loops.
Is that with plan or should I adjust more.
Please advice
Thanks and rgds
SaazAre the line estimates accurate?
Given that all say 1 and dynamic sampling has been used, it is likely that you have no stats gathered for these objects?
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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.
-
Hello
How I watched the explain query plan?
I tried...
then then I triedexplain plan for select * from dual; Explained
Oracle version 11.1.0 information;select * from from table(dbms_xplan.display); plan_table_output ....
Is what I have, it is true m do? or if not can you explain to me how I am looking for explain plan of the query...
Thank you!!!Yes, that seems correct
SQL> explain plan for 2 select * 3 from dual 4 / Explained. SQL> select * 2 from table (dbms_xplan.display()) 3 / PLAN_TABLE_OUTPUT ---------------------------------------------------------------------------------- Plan hash value: 272002086 -------------------------------------------------------------------------- | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | -------------------------------------------------------------------------- | 0 | SELECT STATEMENT | | 1 | 2 | 2 (0)| 00:00:01 | | 1 | TABLE ACCESS FULL| DUAL | 1 | 2 | 2 (0)| 00:00:01 | -------------------------------------------------------------------------- 8 rows selected. SQL> -
Hello
to use the map feature to explain within the spreadsheet (sqldev 2.1, 15 Dec 09), sqldev requires the SELECT_CATALOG_ROLE and the privileges to SELECT ANY DICTIONARY.
Why?
1. even with only the roles CONNECT and classic RESOURCE course, I can run "explains the plan for...» ' and ' select * from table (dbms_xplan.display); "and get the xplan.
2. do you not see that the problems in persuading those hard core DBAs, that developers need xplan - and Yes, they can read them?1 seems one of these bugs... There are more areas that require privileges. DEV?
2. a request to the Exchange, but unfortunately rejected. You can ask once again, but given the unusual support on votes, it would be simply rejected again.Kind regards
K. -
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
-
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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