How many cursor level for nested loop?
Cursor for loop nested up to level (depth)?
CURSOR cur_user_tab_cols
IS SELECT column_name
FROM user_tab_cols
WHERE column_name = 'DQ_SUMMARY';
The cursor should not
CURSOR cur_user_tab_cols
IS SELECT column_name
Of user_tab_cols
WHERE table_name = 'DQ_SUMMARY ';
Published by: Kiran on February 2, 2012 04:13
Tags: Database
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Cursor implicit FOR THE LOOP and WHERE CURRENT OF
Is it possible to add some updates and WHERE CURRENT OF for an implicit cusror of LOOPS? There seems to be no way to reference the cursor as you can with an explicit cursor.
BEGIN
FOR point IN)
SELECT last_name, job_id
Employees
WHERE job_id LIKE '% % CLERK '.
AND manager_id > 120
ORDER BY name
)
LOOP
...
...
...
END LOOP;
END;
/
Thank you
It must be an explicit cursor.
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fucanon wrote:
But that's okay, because when I send this layer 2 levels after working on it, my image looks the way I want it. I'm doing this right?
You make more work for yourself as necessary. Always perform your choice of area first, then when you create a levels adjustment layer, the layer will be hidden automatically to your selection and you don't have to worry about the order of the layers:
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Not the same State (<>) of nested loops
Hi gurus and Experts.
I need advice/suggestion on the query plan below. This plan is go for Nested Loops, am not able to force to go to the hash join or Merge Join with tips.
Can someone help me please what is happening, and it is possible to escape from nested loops.
I don't want to take the help of index for this scenario.
D/B: Oracle 11 g 2,
create table parent as with main as (select --+materialize round(dbms_random.value(low=>1,high=>100)) SAMPLE_ID,dbms_random.string(opt=>'U',len=>10) SAMPLE_TEXT,rownum id from dual connect by level<=100000) select sample_id,rpad(sample_text,10,'*') padding,sample_text,id from main order by idcreate table child as with main as (select --+materialize round(dbms_random.value(low=>1,high=>100)) SAMPLE_ID,dbms_random.string(opt=>'U',len=>10) SAMPLE_TEXT,rownum id from dual connect by level<=10000) select sample_id,rpad(sample_text,10,'*') padding,sample_text,id from main order by idselect --+use_hash(p c) p.id from parent p,child c where p.id<>c.idPlan SELECT STATEMENT ALL_ROWSCost: 973,076 Bytes: 8,999,910,000 Cardinality: 999,990,000 3 NESTED LOOPS Cost: 973,076 Bytes: 8,999,910,000 Cardinality: 999,990,000 1 TABLE ACCESS FULL TABLE APP.CHILD Cost: 12 Bytes: 40,000 Cardinality: 10,000 2 TABLE ACCESS FULL TABLE APP.PARENT Cost: 97 Bytes: 499,995 Cardinality: 99,999902629 wrote:
I need advice/suggestion on the query plan below. This plan is go for Nested Loops, am not able to force to go to the hash join or Merge Join with tips.
You will not be able to use a hash join
http://docs.Oracle.com/CD/E11882_01/server.112/e16638/optimops.htm#i36043
>
The optimizer uses hash join to join two tables if they are added by using an equijoin and if one of the following conditions are met:
>You may be able to force a sort merge join, it does not mention if different will work, I don't see how it would be
http://docs.Oracle.com/CD/E11882_01/server.112/e16638/optimops.htm#i49183
>
Sort merge joins are useful when the join condition between two tables is a condition of inequality such as <,> <=,>, or > =. Fusion type joints are more successful than joins loops nested for large sets of data. You cannot use hash joins unless there is a condition of equality.
>I can't imagine this treatment an antijoin more efficiently than nested If loops.
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Hello
I have a range of numbers from B2 - B11 until the G2 - G11. For example:
31
7
28
10
4
17
20
13
44
2
1
39
32
45
39
4
10
25
26
38
27
43
12
3
42
35
37
1
34
21
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39
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5
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21
33
34
4
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10
31
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1
24
35
3
20
2
24
27
22
30
10
34
36
32
3
27
I would like to know who among these numbers have occurred and how many times. For example (just to have as an example): number 10 repetitions 5 times, number 13 repeated 3 times, 24 repetitions 9 times.
Repeats = duplicates.
I want to know all the repetitive number and how many times they repeat.
Is there some kind of formula I can use to get there. It would be good to have the sorted result. For example:
32 repeats 10 times
24 repeat 9 times
6 reps 8 times
5 repeat 7 times
22. repeat 6 times
10 repeats 5 times and so on.
Hello
Problem of three steps:
- Determine the distinct values
- Count the number of times each appears in the table
- Sort by value or frequency (or both).
The first step is easily handled by copy separate Automator Service, a Service of Automator, written by SGIII. A link to the file in post June 21 of the SG in this thread: Re: Analyzing column (maybe not the correct wording)
After downloading and installing the service, select the cells containing the numbers, call the service, and then select the first regular (ie. non-header) cell to a new table and the dough.
(The following assumes the new table has a header row, no column header, and you have selected - click - cell A2 before pasting.)
You will get a list of distinct numbers in a single column (A2 - A34, of your sample and support of note).
To count the numbers:
In this example, the existing table is named 'Table 1'
Enter the following formula in B2 the new table, and then fill up to the last line of the column B:
= COUNTIF (Table 1::B:G, A)
Results should be as shown:
Sort the results on column (value) or B (frequency)
Two types (A, then B) will be put in order of frequency, with values appear the same number of times sorted by value within this group.
Kind regards
Barry
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use OPT_ESTIMATE or CARDINALITY tip for correct estimation of nested loops
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SEL$A8B7A3F4 11 - SEL$A8B7A3F4 / D@SEL$13 23 - SEL$A8B7A3F4 / OH@SEL$1 24 - SEL$A8B7A3F4 / O@SEL$13 25 - SEL$A8B7A3F4 / O@SEL$13 26 - SEL$13512960 / DF@SEL$13 27 - SEL$13512960 28 - SEL$13512960 / DF1@SEL$14 29 - SEL$13512960 / DF1@SEL$14 30 - SEL$A8B7A3F4 / H7@SEL$2 31 - SEL$A8B7A3F4 / H7@SEL$2 32 - SEL$A8B7A3F4 / DS@SEL$9 33 - SEL$A8B7A3F4 / RST@SEL$11 34 - SEL$A8B7A3F4 / ITT@SEL$3 35 - SEL$A8B7A3F4 / ST@SEL$5 36 - SEL$A8B7A3F4 / PT@SEL$7 Outline Data ------------- /*+ BEGIN_OUTLINE_DATA IGNORE_OPTIM_EMBEDDED_HINTS OPTIMIZER_FEATURES_ENABLE('11.2.0.3') DB_VERSION('11.2.0.3') OPT_PARAM('optimizer_index_cost_adj' 20) ALL_ROWS OUTLINE_LEAF(@"SEL$13512960") PUSH_PRED(@"SEL$A8B7A3F4" "DF"@"SEL$13" 11) OUTLINE_LEAF(@"SEL$A8B7A3F4") ELIMINATE_JOIN(@"SEL$2D47CDEA" "DTT"@"SEL$13") OUTLINE(@"SEL$14") OUTLINE(@"SEL$A8B7A3F4") ELIMINATE_JOIN(@"SEL$2D47CDEA" "DTT"@"SEL$13") OUTLINE(@"SEL$2D47CDEA") MERGE(@"SEL$3FAACB6D") OUTLINE(@"SEL$15") OUTLINE(@"SEL$3FAACB6D") MERGE(@"SEL$11") MERGE(@"SEL$A1A6E401") OUTLINE(@"SEL$12") OUTLINE(@"SEL$11") OUTLINE(@"SEL$A1A6E401") MERGE(@"SEL$9") MERGE(@"SEL$BFB1842A") OUTLINE(@"SEL$10") OUTLINE(@"SEL$9") OUTLINE(@"SEL$BFB1842A") MERGE(@"SEL$7") MERGE(@"SEL$EEDE2B8C") OUTLINE(@"SEL$8") OUTLINE(@"SEL$7") OUTLINE(@"SEL$EEDE2B8C") MERGE(@"SEL$5") MERGE(@"SEL$A6B38458") OUTLINE(@"SEL$6") OUTLINE(@"SEL$5") OUTLINE(@"SEL$A6B38458") MERGE(@"SEL$171BE69E") MERGE(@"SEL$3") OUTLINE(@"SEL$4") OUTLINE(@"SEL$171BE69E") MERGE(@"SEL$AF02BF1E") OUTLINE(@"SEL$3") OUTLINE(@"SEL$2") OUTLINE(@"SEL$AF02BF1E") MERGE(@"SEL$13") OUTLINE(@"SEL$1") OUTLINE(@"SEL$13") FULL(@"SEL$A8B7A3F4" "OH"@"SEL$1") INDEX(@"SEL$A8B7A3F4" "O"@"SEL$13" ("OCRN"."ORG_PK" "OCRN"."DSCLR_DSCLB_FL" "OCRN"."DSCLR_RPTBL_FL")) BITMAP_TREE(@"SEL$A8B7A3F4" "D"@"SEL$13" AND(OR(1 1 ("DSCLR"."FORM_TYPE_CD") 2 ("DSCLR"."FORM_TYPE_CD")) ("DSCLR"."DSCLR_TYPE_CD"))) NO_ACCESS(@"SEL$A8B7A3F4" "DF"@"SEL$13") INDEX(@"SEL$A8B7A3F4" "H7"@"SEL$2" ("H760_RGLTY_ACTN_DSCLR"."FLNG_PK" "H760_RGLTY_ACTN_DSCLR"."DSCLR_PK" "H760_RGLTY_ACTN_DSCLR"."REC_SEQ_NB")) FULL(@"SEL$A8B7A3F4" "DS"@"SEL$9") FULL(@"SEL$A8B7A3F4" "RST"@"SEL$11") FULL(@"SEL$A8B7A3F4" "ITT"@"SEL$3") FULL(@"SEL$A8B7A3F4" "ST"@"SEL$5") FULL(@"SEL$A8B7A3F4" "PT"@"SEL$7") LEADING(@"SEL$A8B7A3F4" "OH"@"SEL$1" "O"@"SEL$13" "D"@"SEL$13" "DF"@"SEL$13" "H7"@"SEL$2" "DS"@"SEL$9" "RST"@"SEL$11" "ITT"@"SEL$3" "ST"@"SEL$5" "PT"@"SEL$7") USE_NL(@"SEL$A8B7A3F4" "O"@"SEL$13") NLJ_BATCHING(@"SEL$A8B7A3F4" "O"@"SEL$13") USE_HASH(@"SEL$A8B7A3F4" "D"@"SEL$13") USE_NL(@"SEL$A8B7A3F4" "DF"@"SEL$13") USE_NL(@"SEL$A8B7A3F4" "H7"@"SEL$2") NLJ_BATCHING(@"SEL$A8B7A3F4" "H7"@"SEL$2") USE_HASH(@"SEL$A8B7A3F4" "DS"@"SEL$9") USE_HASH(@"SEL$A8B7A3F4" "RST"@"SEL$11") USE_HASH(@"SEL$A8B7A3F4" "ITT"@"SEL$3") USE_HASH(@"SEL$A8B7A3F4" "ST"@"SEL$5") USE_HASH(@"SEL$A8B7A3F4" "PT"@"SEL$7") SWAP_JOIN_INPUTS(@"SEL$A8B7A3F4" "D"@"SEL$13") INDEX_RS_ASC(@"SEL$13512960" "DF1"@"SEL$14" ("DSCLR_FLNG"."DSCLR_PK" "DSCLR_FLNG"."BLLBL_FL")) END_OUTLINE_DATA */This plan gives you an idea of why your initial synchronization has been long - most of your readings are one-piece readings and you have read 53 724 blocks. If you estimate 1 centisecond by read (which could be on a reasonable charge system) then it is 537 seconds. to 5 milliseconds per read, it's still 268 seconds or 4 minutes and 30 seconds.
A quick break down of some (the worst case) potential time - only you can say whether or not some of these readings will be always/often/never being cached in the file or at the SAN level.
Line 11 - physical reads 6 400 done - it's a tree bitmap then the readings are in the order of physical table with no. rereads. Call 5ms by read-online 32 seconds. L
| * 11 | TABLE ACCESS BY INDEX ROWID | DSCLR | 1. 5079. 158K | 533 (1) | 00:00:08 | 91395 | 00:00:01.27 | 6460. 6400 | | | |
The hash join takes us from 6 400 to 11 788 because it joins, lines 21 to 25 (nested loop) in which most of the work is the random access table with some automatic caching: 26 seconds. Do a search here rather than indexed 22 000 access? Which would be faster, which would charge less.
| * 25. TABLE ACCESS BY INDEX ROWID | OCRN | 22050. 1. 21. 1 (0) | 00:00:01 | 21059 | 00:01:04.74 | 15634 | 5280. | | |
Three nested loops that introduce more readings:
11788 9-> 26386:14 600 of the predicate view pushed which some lies but a very large index and a table of random access 73 seconds
8 26386-> 33783:7 400 index line 30 - big clue about 37 seconds Access hides
33783 7-> 53691:19 900 31 table access - large table line, not much caching, 100 seconds.
In each case, you can ask if an analysis would take less time than all of these random reads.
NOTE - all I'm pointing our here where you potentially use a lot of time so that you can ask whether or not you should do little of the query in this way, or if there is an alternative, or if the work you're doing is absolutely necessary. If you want to optimize the query you should consider the intent of the query and think your way through a reasonable join order to see if you can imagine an effective way to get the same data. I have written a few articles and presentation on an approach that begins by drawing - here is a link to an article I wrote for a group of SQL Server: https://www.simple-talk.com/sql/performance/designing-efficient-sql-a-visual-approach/
and a video I did with Kyle Hailey, while he was working for Embarcadero:Tune in for the ultimate SQL Tune-off | Landing pages
Concerning
Jonathan Lewis
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Need help for the conversion of the nested loops to use the stream
I'm trying to teach me how to effectively use the java stream, but finds it difficult to find the correct syntax for a problem of nested loop. I would like to convert the following code to use the Java 8 stream instead of nested loops. Can anyone provide an example or a solution?
/** * Return all members of stringListOne that begin with any of the strings in * stringListTwo * * @return all members of stringListOne that begin with any of the strings in * stringListTwo */ Set<String> getFilteredStrings(Set<String> stringListOne, Set<String> stringListTwo) { Set<String> stringListOneFiltered = new HashSet<String>(); for (String next : stringListOne) { for (String nextPrefix : stringListTwo) { if (next.startsWith(nextPrefix)) { stringListOneFiltered.add(next); } } } return stringListOneFiltered; }Here's a test case for the above code:
/** * Test method for {@link scratchpad.MyClass#getFilteredStrings(java.util.Set, java.util.Set)}. */ @Test public final void testGetFilteredStrings() { MyClass uut = new MyClass(); Set<String> stringListOne = new HashSet<String>(); stringListOne.add("until"); stringListOne.add("unite"); stringListOne.add("under"); stringListOne.add("prepare"); stringListOne.add("pretend"); stringListOne.add("prefix"); stringListOne.add("prepend"); stringListOne.add("post"); stringListOne.add("positive"); stringListOne.add("postgame"); stringListOne.add("postpone"); Set<String> stringListTwo = new HashSet<String>(); stringListTwo.add("post"); stringListTwo.add("pre"); stringListTwo.add("und"); Set<String> result= uut.getFilteredStrings(stringListOne, stringListTwo); System.out.println(result); assertEquals(8, result.size()); }Thanks for any help you can provide! I get the hang of using the course of water, but this particular code was difficult.
tmbc
I found the following solution to my question:
GetFilteredStrings (Set stringListOne, the value {Set
stringListTwo) Predicate startsWith
= p-> stringListTwo.stream () .anyMatch (prefix-> p.startsWith (prefix)); Return stringListOne.stream () .filter (startsWith) .collect (Collectors.toSet ());
}
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How to find the child level for each table in a relational model?
Earthlings,
I need your help, and I know that, "Yes, we can change." Change this thread to a question answered.
So: How to find the child level for each table in a relational model?
I have a database of relacional (9.2), all right?
Tips:. O /* This is a child who makes N references to each of the follow N parent tables (here: three), and so on. */ /↑\ Fks O"O O" <-- level 2 for first table (circle) /↑\ Fks "o"o"o" <-- level 1 for middle table (circle) ↑ Fk "º"
-Each circle represents a table;
-Red no tables have foreign key
-the picture on the front line of tree, for example, a level 3, but when 3 becomes N? How is N? That is the question.
I started to think about the following:
First of all, I need to know how to take the kids:
Thought...select distinct child.table_name child from all_cons_columns father join all_cons_columns child using (owner, position) join (select child.owner, child.constraint_name fk, child.table_name child, child.r_constraint_name pk, father.table_name father from all_constraints father, all_constraints child where child.r_owner = father.owner and child.r_constraint_name = father.constraint_name and father.constraint_type in ('P', 'U') and child.constraint_type = 'R' and child.owner = 'OWNER') aux using (owner) where child.constraint_name = aux.fk and child.table_name = aux.child and father.constraint_name = aux.pk and father.table_name = aux.father;
We will share!
Thanks in advance,
Philips
Published by: BluShadow on April 1st, 2011 15:08
formatting of code and hierarchy for readbilityHave you looked to see if there is a cycle in the graph of dependence? Is there a table that has a foreign key to B and B has a back of A foreign key?
SQL> create table my_emp ( 2 emp_id number primary key, 3 emp_name varchar2(10), 4 manager_id number 5 ); Table created. SQL> ed Wrote file afiedt.buf 1 create table my_mgr ( 2 manager_id number primary key, 3 employee_id number references my_emp( emp_id ), 4 purchasing_authority number 5* ) SQL> / Table created. SQL> alter table my_emp 2 add constraint fk_emp_mgr foreign key( manager_id ) 3 references my_mgr( manager_id ); Table altered. SQL> ed Wrote file afiedt.buf 1 select level lvl, 2 child_table_name, 3 sys_connect_by_path( child_table_name, '/' ) path 4 from (select parent.table_name parent_table_name, 5 parent.constraint_name parent_constraint_name, 6 child.table_name child_table_name, 7 child.constraint_name child_constraint_name 8 from user_constraints parent, 9 user_constraints child 10 where child.constraint_type = 'R' 11 and parent.constraint_type = 'P' 12 and child.r_constraint_name = parent.constraint_name 13 union all 14 select null, 15 null, 16 table_name, 17 constraint_name 18 from user_constraints 19 where constraint_type = 'P') 20 start with child_table_name = 'MY_EMP' 21* connect by prior child_table_name = parent_table_name SQL> / ERROR: ORA-01436: CONNECT BY loop in user dataIf you have a cycle, you have some problems.
(1) it is a NOCYCLE keyword does not cause the error, but that probably requires an Oracle version which is not so far off support. I don't think it was available at the time 9.2 but I don't have anything old enough to test on
SQL> ed Wrote file afiedt.buf 1 select level lvl, 2 child_table_name, 3 sys_connect_by_path( child_table_name, '/' ) path 4 from (select parent.table_name parent_table_name, 5 parent.constraint_name parent_constraint_name, 6 child.table_name child_table_name, 7 child.constraint_name child_constraint_name 8 from user_constraints parent, 9 user_constraints child 10 where child.constraint_type = 'R' 11 and parent.constraint_type = 'P' 12 and child.r_constraint_name = parent.constraint_name 13 union all 14 select null, 15 null, 16 table_name, 17 constraint_name 18 from user_constraints 19 where constraint_type = 'P') 20 start with child_table_name = 'MY_EMP' 21* connect by nocycle prior child_table_name = parent_table_name SQL> / LVL CHILD_TABLE_NAME PATH ---------- ------------------------------ -------------------- 1 MY_EMP /MY_EMP 2 MY_MGR /MY_EMP/MY_MGR 1 MY_EMP /MY_EMP 2 MY_MGR /MY_EMP/MY_MGR(2) If you try to write on a table and all of its constraints in a file and do it in a valid order, the entire solution is probably wrong. It is impossible, for example, to generate the DDL for MY_EMP and MY_DEPT such as all instructions for a table come first, and all the instructions for the other are generated second. So even if NOCYCLE to avoid the error, you would end up with an invalid DDL script. If that's the problem, I would rethink the approach.
-Generate the DDL for all tables without constraint
-Can generate the DDL for all primary key constraints
-Can generate the DDL for all unique key constraints
-Can generate the DDL for all foreign key constraintsThis is not solidarity all the DOF for a given in the file object. But the SQL will be radically simpler writing - there will be no need to even look at the dependency graph.
Justin
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I have a nested loop
loop1 start
...
loop2 start
...
end loop2
...
end loop1
I want to know how can I come out the two loops of the inner loop.Hello
Out of the inner loop in the use of nested loops labelsSQL> BEGIN 2 <> 3 FOR i IN 1..2 LOOP 4 < > 5 FOR j IN 1..4 LOOP 6 DBMS_OUTPUT.PUT_LINE('I am in Inner Loop'); 7 END LOOP inner; 8 DBMS_OUTPUT.PUT_LINE('I am in outer Loop'); 9 END LOOP outer; 10 END; 11 / I am in Inner Loop I am in Inner Loop I am in Inner Loop I am in Inner Loop I am in outer Loop I am in Inner Loop I am in Inner Loop I am in Inner Loop I am in Inner Loop I am in outer Loop PL/SQL procedure successfully completed. SQL> BEGIN 2 < > 3 FOR i IN 1..2 LOOP 4 < > 5 FOR j IN 1..4 LOOP 6 DBMS_OUTPUT.PUT_LINE('I am in Inner Loop'); 7 exit inner; 8 END LOOP inner; 9 DBMS_OUTPUT.PUT_LINE('I am in outer Loop'); 10 END LOOP outer; 11 END; 12 / I am in Inner Loop I am in outer Loop I am in Inner Loop I am in outer Loop PL/SQL procedure successfully completed. SQL> SQL> BEGIN 2 < > 3 FOR i IN 1..2 LOOP 4 < > 5 FOR j IN 1..4 LOOP 6 DBMS_OUTPUT.PUT_LINE('I am in Inner Loop'); 7 exit outer; 8 END LOOP inner; 9 DBMS_OUTPUT.PUT_LINE('I am in outer Loop'); 10 END LOOP outer; 11 END; 12 / I am in Inner Loop PL/SQL procedure successfully completed. Twinkle
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How many gigabytes of data storage has the new Apple Watch series 2 and how many GB are free for music?
Hello
Apple has not yet announced the capacity of storage or the music of Apple Watch series 2 storage limit.
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