Optimizer Cannot Merge A View That Contains Set Operator
Jul 18, 2012
Query -
SELECT *
FROM sysadm.ps_tmtl_post_vw a
WHERE a.month_prepared_for = 'JUNE,2012'
AND a.ca_status = 'P5 CUST GO AHEAD'
[code]...
When I try for the SQL-Tuning sets its throws error that
ADDITIONAL INFORMATION SECTION
-------------------------------------------------------------------------------
- The optimizer could not merge the view at line ID 2 of the execution plan.
The optimizer cannot merge a view that contains a set operator.
I read earlier forum where it says that optimizer unable to interpret the conditions like order by etc etc.Now there is one view which is getting used in the query when I did select * from vw it took more than 16 hrs to complete. (bad view).
Attached File(s)
exec_plan.txt ( 2.06MB )
Number of downloads: 1
view_def.txt ( 14.12K )
Number of downloads: 2
I want to know how the Oracle optimizer choose joins and apply them while executing the query. So that I will insure about optimizer join before writing any query.
I have problem with merging rows into view. I have created "INSTEAD OF" triggers on the view for insert/delete/update of rows. However, the merge is not working and it needs rowid to work. Is there any way how to make MERGE working here ? I must use merge, because I am changing the structure of database used for large java application. And it uses tons of merge commands,changing them to insert/update is inefficient because of development-time and of course resulting execution-time.
create table val_00 ( id number(10), data varchar2(100), constraint pk_val_00 primary key (id) validate ) organization index; [code]....
I am quiet confused with the optimizer collection stats job on 11g. when run the following query i see the statistics enabled.
SQL> select client_name, status from dba_autotask_client;
CLIENT_NAME STATUS ---------------------------------------------------------------- -------- auto optimizer stats collection ENABLED auto space advisor ENABLED sql tuning advisor ENABLED
I can gather statistics manually using DBMS_STATS, but there is no automated gathering of optimizer stats. how can i have system run and collect statistics on a daily bases?
SELECT v.key$ FROM VERSION_TABLE v, DOCUMENT_TABLE d, CLASS_TABLE z WHERE v.documentKey = d.key$ AND d.classKey = z.key$ AND z.key$ IN (SELECT zz.key$ FROM CLASS_TABLE zz START WITH zz.name = 'esDTTemplate' CONNECT BY PRIOR zz.key$ = zz.parentKey) AND v.ESGROUP = 'SearchOperatorsMapping' ORDER BY d.name
Now I noticed that the subquery is never used to seed the join: indexes - if any - are used. Otherwise a full table scan is performed.In the example - if ESGROUP is indexed, then it's chosen to start the join evaluation. If not, a full table scan is performed.Is there any way to suggest to the optimizer to use the subquery in case there are no indexes - as a fallback ?
In the above example where VERSION_TABLE contains nearly two million records, the no index solution takes 60 secs. vs. less than 1 sec. in the index case.Wrapping the hierarchical query in a inline view leads to same result.
PS: the execution plan (without index) is: ------------------------------------------------------------------------------------------------------------- | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time ------------------------------------------------------------------------------------------------------------- | 0 | SELECT STATEMENT | | | | 9 (100)| | | 1 | SORT ORDER BY | | 1 | 171 | 9 (23)| 00:00:01 | |* 2 | HASH JOIN SEMI | | 1 | 171 | 8 (13)| 00:00:01 |
I'm looking to see if there is a way (fully expecting it to be an underscore, or two...) to force the optimizer to keep churning until all permutations are exhausted.I'm aware that it, to paraphrase, cuts out when it's spent more time parsing than it would just running it based on it's estimates.
I've got some irritating problems with xml rewrite, xml indexes and access paths/cardinalities etc and I'm really needing the entire thing considered as a one off for debugging this. I've already cranked up the maximum permutations to the max but it's not enough, it shorts out after 5041 permutations (I'd set that to 80000 max).
I know you'd not want to do this in the real world but I cant get the damned thing to run the plan I want in a 10053 so I can see the values it has there. I know I can hint it, but I'm trying to ascertain why it's not even considering it in a "normal" parse.
In my database auto optimizer stats collection job scheduled. It is successfully running,i am confirming this by viewing DBA_AUTOTASK_JOB_HISTORY. My doubt is whether stats gather job collect statistics when 10%(default value) of data modified in a hole table or table partitions.
Below is the output for user_tab_modification.I am able to see two entry for same table.
SQL> select TABLE_NAME,PARTITION_NAME,INSERTS,UPDATES,DELETES,TIMESTAMP,TRUNCATED from USER_tab_modifications where table_name='DLM_PERFORMANCE_DATA';
TABLE_NAME PARTITION_NAME INSERTS UPDATES DELETES TIMESTAMP TRU ------------------------------ ------------------------------ ---------- ---------- ---------- ----------- --- DLM_PERFORMANCE_DATA 169812174 0 0 20-SEP-2012 NO DLM_PERFORMANCE_DATA SYS_P2663580 4946409 0 0 20-SEP-2012 NO
I need to get create_user_id for different sale_location_id.Also create_user_id field will be having different values.This is part of my big query.I need to add this stmt in that.So taken that part and figuring it out.
create table it(sale_location_id number,create_user_id varchar2(10)); table IT created. insert into it values(1,'ISRA') 1 rows inserted. insert into it values(2,'USFA') 1 rows inserted.
select a.sale_location_id,decode(a.sale_location_id,1,a.create_user_id like 'IS%',a.create_user_id like 'U%') create_user_id from it a
given error as:
ORA-00907: missing right parenthesis 00907. 00000 - "missing right parenthesis"
I have a table in SQL , I am creating a column Of name in it , i want to restrict user to enter name in Capital only ,and i want to create this at table level . I tried Check Operator but failed .
1) Can we set a different symbol other than '' for escape operator. 2) If yes, how to see the current escape operator symbol. 3) How to find out the below name with escape operator?
I have a requirement in SQL that I have to number each row. Hence I thought of using ROWNUM. But the sql query I'm using uses UNION operator. Hence I used like this
select a,b,rownum as 'field1' from table1 union select c,d,1 as 'field1' from table2
Want to understand difference between Concat function and "||" operator. I am getting the same result for both. Below is the test case for your reference.
Select 'H '||' S' From Dual; --Output H S
Select Concat('H ',' S') A From Dual; --Output H S
Select Length('H '||' S') A From Dual; --Output 6
Select Length(Concat('H ',' S')) A From Dual; --Output 6
I want to link to blocks using description as there is no relation , for example i have two tables with one field in common called description, and i want to link this field in two tables using like operator.
create table item ( item_code varchar2(12),item_name varchar2(30)); insert into item VALUES('A','HEA160'); insert into item VALUES('B','HEA180'); create table stk (sl_item varchar2(12),sl_desc varchar2(30),sl_qty number); insert into stk VALUES ('X','HEA160X1000',12); insert into stk VALUES ('X','HEA160X2000',4); insert into stk VALUES ('Y','HEA180X3000',10);
Suppose i click on item block item_desc with value on HEA160 all the items similar to that should appear in stk block like 'HEA160X1000' ,'HEA160X2000' , if i click on 'HEA180' on item then 'HEA180X3000' it should come.
I am using the following query with like 'T_%', i am getting 80 rows out of which the first table_name doesn't even have a beginning part 'T_%'.
the first table name has not started with 'T_', why is it appearing.
********************************************************************* SELECT 'Truncate table epic500.'||table_name FROM user_tables where table_name like 'T_%' order by table_name; ********************************************************************* output: Truncate table epic500.TEMP_ENC_DEL Truncate table epic500.T_ACCOMMODATION_CODE
