Variable and nested loops
Hi, I'm a relatively new to programming of LV, so be gentle.
In a Word, I am running nested loops than the material test power on and off cycles. The parameters for each loop is entered on the front panel of the user. For example, the power supply at the time, how many times to read in the data, power supply off time and the number of cycles power is a typical customer task ask me to do. Therefore, I decided to do a generic as possible executable vi instead of writing code (in which I request is trivial), that my technicians can easily use.
I want to put a counter - down in this vi, even a journey of one. I'll take the more the off time multiplied by the number of cycles and display on the front panel. For some reason that I can't find a simple way such that when the last cycle ended if poster zero before the program ends.
For example, the total is equal to 60 minutes and 10-minute cycle. I run the program and the display shows 60 during the first cycle, after the first cycle is complete and the second cycle begins the display turns 50, and so on until that last cycle where you can read 10. Then the program ends and the screen 10. How can I get a last beat of this kind it says 0 and 0 poster before the end of the program?
Thank you!
Wire a zero to a local variable of this indicator so that it can turn when the while loop ends.
Tags: NI Software
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Hello world
I'm using Labview 2009.
I want to change the value of a variable by using the wheel or keyboard.
So I downloaded a button and the screws of the keyboard that suits my needs of multi-rotation forum.
These two screws are running inside a WHILE loop. Because I would be constantly updating the variable I will run my main screw that houses these two screws also looped a WHILE.
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I couldn't run my main VI because of this problem.I tried in 2ways
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Kind regards
Maury
You make a mistake of data flow. The outer loop can turn only if all of the code that he has completed. The structure of the event cannot complete because inside while loop has not finished, and if inside so that the loop ends, the loop cannot turn because the structure of the event stalls. You can only go to the next iteration after all both have completed, from the mess.
All you need to do to incorporate ALL the code inside the structure of the event. Attached, it's a simple project (LV 9.0), modify as necessary.
See if it makes sense for you. (there are a few minor bugs probably)
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See you soon
Eddie
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Save several bays of nested loops
Hello
My vi generates several bays in each iteration of the loop, and I would like to save the data. I did work with the files before recording, but it's never with nested loops. I don't know how to keep the information of the iteration of one loop at the other. I would like suggestions. I made this sample & simple vi (attached file) that simulates the question I have. I have a file with a time column and different columns of food beside him.
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A
1. the first element of the first matrix signal IS always zero. The Signal to simulate always starts at zero. You compare it to the indicator of "first date". Who got by converting the dynamic data type to a scalar. And it's always the last element of the actual data. And since the "first out" is replaced with each iteration of the inner loop, the number you see at the end is actually the latest iteration of the data. Look at "First release" in comparison with the last element of your last column of the table and you will see they are the same.
2. the reason why you have a first column that consists of the steps is because that's what you have wired to initialize the shift register. If you look at my example, you will see that I have an empty array. (The zero is gray.) You, the 0 is not dimmed meaning there is an element. Expand this table to view more items and expand the digital field and you will see more digits. They correspond to what is in your first column.
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use OPT_ESTIMATE or CARDINALITY tip for correct estimation of nested loops
I'm using Oracle 11.2.0.3. Below the execution below plan, how can I use tip OPT_ESTIMATE or CARDINALITY to teach optimization E-lines for ID 9 (Nested Loop) 30553 instead of 6.
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | Id | Operation | Name | Starts | E-Rows |E-Bytes| Cost (%CPU)| E-Time | A-Rows | A-Time | Buffers | OMem | 1Mem | Used-Mem | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | 0 | SELECT STATEMENT | | 1 | | | 4604 (100)| | 30553 |00:00:02.56 | 208K| | | | | 1 | SORT ORDER BY | | 1 | 6 | 7044 | 4604 (1)| 00:01:05 | 30553 |00:00:02.56 | 208K| 41M| 2086K| 36M (0)| |* 2 | HASH JOIN OUTER | | 1 | 6 | 7044 | 4603 (1)| 00:01:05 | 30553 |00:00:02.10 | 208K| 38M| 3120K| 39M (0)| |* 3 | HASH JOIN OUTER | | 1 | 6 | 6870 | 4599 (1)| 00:01:05 | 30553 |00:00:01.97 | 208K| 38M| 3120K| 39M (0)| |* 4 | HASH JOIN OUTER | | 1 | 6 | 6744 | 4591 (1)| 00:01:05 | 30553 |00:00:01.85 | 208K| 37M| 3121K| 39M (0)| |* 5 | HASH JOIN OUTER | | 1 | 6 | 6570 | 4584 (1)| 00:01:05 | 30553 |00:00:01.74 | 208K| 37M| 3121K| 38M (0)| |* 6 | HASH JOIN OUTER | | 1 | 6 | 6414 | 4576 (1)| 00:01:05 | 30553 |00:00:01.60 | 208K| 37M| 3121K| 38M (0)| | 7 | NESTED LOOPS | | 1 | | | | | 30553 |00:00:01.44 | 208K| | | | | 8 | NESTED LOOPS | | 1 | 6 | 6318 | 4572 (1)| 00:01:05 | 30553 |00:00:01.31 | 182K| | | | | 9 | NESTED LOOPS | | 1 | 6 | 1830 | 4568 (1)| 00:01:04 | 30553 |00:00:01.11 | 124K| | | | |* 10 | HASH JOIN | | 1 | 2069 | 270K| 2499 (1)| 00:00:35 | 30646 |00:00:00.46 | 23738 | 6539K| 2033K| 7965K (0)| |* 11 | TABLE ACCESS BY INDEX ROWID | DSCLR | 1 | 5079 | 158K| 533 (1)| 00:00:08 | 91395 |00:00:00.28 | 6460 | | | | | 12 | BITMAP CONVERSION TO ROWIDS | | 1 | | | | | 197K|00:00:00.16 | 615 | | | | | 13 | BITMAP AND | | 1 | | | | | 4 |00:00:00.14 | 615 | | | | | 14 | BITMAP OR | | 1 | | | | | 4 |00:00:00.07 | 276 | | | | | 15 | BITMAP CONVERSION FROM ROWIDS| | 1 | | | | | 2 |00:00:00.02 | 69 | | | | |* 16 | INDEX RANGE SCAN | XIF913DSCLR | 1 | 274K| | 14 (0)| 00:00:01 | 68407 |00:00:00.01 | 69 | | | | | 17 | BITMAP CONVERSION FROM ROWIDS| | 1 | | | | | 4 |00:00:00.05 | 207 | | | | |* 18 | INDEX RANGE SCAN | XIF913DSCLR | 1 | 274K| | 42 (0)| 00:00:01 | 209K|00:00:00.03 | 207 | | | | | 19 | BITMAP CONVERSION FROM ROWIDS | | 1 | | | | | 5 |00:00:00.06 | 339 | | | | |* 20 | INDEX RANGE SCAN | XIF910DSCLR | 1 | 274K| | 67 (0)| 00:00:01 | 239K|00:00:00.04 | 339 | | | | | 21 | NESTED LOOPS | | 1 | | | | | 21749 |00:00:00.10 | 17278 | | | | | 22 | NESTED LOOPS | | 1 | 3404 | 339K| 1965 (1)| 00:00:28 | 22772 |00:00:00.03 | 1246 | | | | | 23 | TABLE ACCESS FULL | TMP_RPT_BD_STATE_DATA_DWNLD | 1 | 3255 | 257K| 11 (0)| 00:00:01 | 3255 |00:00:00.01 | 27 | | | | |* 24 | INDEX RANGE SCAN | XIE2OCRN | 3255 | 7 | | 1 (0)| 00:00:01 | 22772 |00:00:00.03 | 1219 | | | | |* 25 | TABLE ACCESS BY INDEX ROWID | OCRN | 22772 | 1 | 21 | 1 (0)| 00:00:01 | 21749 |00:00:00.06 | 16032 | | | | |* 26 | VIEW PUSHED PREDICATE | | 30646 | 1 | 171 | 1 (0)| 00:00:01 | 30553 |00:00:00.63 | 101K| | | | | 27 | WINDOW BUFFER | | 30646 | 1 | 21 | 1 (0)| 00:00:01 | 46946 |00:00:00.59 | 101K| 2048 | 2048 | 2048 (0)| |* 28 | TABLE ACCESS BY INDEX ROWID | DSCLR_FLNG | 30646 | 1 | 21 | 1 (0)| 00:00:01 | 46946 |00:00:00.32 | 101K| | | | |* 29 | INDEX RANGE SCAN | XIE1DSCLR_FLNG | 30646 | 2 | | 1 (0)| 00:00:01 | 46946 |00:00:00.21 | 59862 | | | | |* 30 | INDEX RANGE SCAN | XPKH760_RGLTY_ACTN_DSCLR | 30553 | 1 | | 1 (0)| 00:00:01 | 30553 |00:00:00.18 | 57541 | | | | | 31 | TABLE ACCESS BY INDEX ROWID | H760_RGLTY_ACTN_DSCLR | 30553 | 1 | 748 | 1 (0)| 00:00:01 | 30553 |00:00:00.11 | 26218 | | | | | 32 | TABLE ACCESS FULL | DSCLR_ST_TYPE_TBL | 1 | 4 | 64 | 4 (0)| 00:00:01 | 4 |00:00:00.01 | 5 | | | | | 33 | TABLE ACCESS FULL | RGLTY_RSLTN_TYPE_TBL | 1 | 12 | 312 | 7 (0)| 00:00:01 | 12 |00:00:00.01 | 10 | | | | | 34 | TABLE ACCESS FULL | INTTR_TYPE_TBL | 1 | 14 | 406 | 7 (0)| 00:00:01 | 14 |00:00:00.01 | 10 | | | | | 35 | TABLE ACCESS FULL | SNCTN_TYPE_TBL | 1 | 15 | 315 | 7 (0)| 00:00:01 | 15 |00:00:00.01 | 10 | | | | | 36 | TABLE ACCESS FULL | PRDCT_TYPE_TBL | 1 | 25 | 725 | 4 (0)| 00:00:01 | 25 |00:00:00.01 | 5 | | | | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ Query Block Name / Object Alias (identified by operation id): ------------------------------------------------------------- 1 - 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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Help to find the best way to interior design (Nested Loops of sliders?)
Oracle 11G
First here the table I work with, for example data
ID FID ANNOTATION DESIGNATION LOW HIGH SEQ 1 1008755360 FC1053, 81-82 FC1053 81 82 1 2 1008755360 XD, 3-24 XD 3 24 2 3 1008756293 FC1053, 81-82 FC1053 81 82 1 4 1008756293 XD, 3-24 XD 3 24 2 Each FID is a different line, these two lines are connected physically, that's why I've shown them here on the table. Each line has a 'meter', in this case, each line has 2 lines of account that are the same.
From there, we can say that FC1053, 81 and 82 are connected between the 2 cables. XD DESIGNATION means that cables are connect not really so I can't ignore those.
We have a different way to show that they connect other than only those data and I need to connect each other too much. For this I need the Info
FID1 LOW HIGH FID2 1008755360 81 82 1008756293 So my first design was the hepatitis hase sliders 2 with the data in the table, as shown above. I would then have a nested loop. The first slider to select the first record, then go down to the second loop where I compare all other records the first record and then go back in the outer loop to move to the next record, then return once again to the inner loop to compare the values again.
LOOP1
LOOP 2
If LOOP1. IDF! LOOP2 =. IDF THEN
IF LOOP1. ANNOTATION = LOOP2. ANNOTATION THEN
-CONNECT THE DATA
ON THE OTHER
IF LOOP1. DESCRIPTION = LOOP2. DESIGNATION THEN
IF LOOP2. LOW BETWEEN LOOP1. LOW AND LOOP1. THEN HIGH
IF LOOP2. HIGH BETWEEN LOOP1. LOW AND LOOP1. HGH THEN
-CONNECT THE DATA
END IF;
END IF;
END IF;
END IF;
END IF;
END LOOP;
-Open and close done to reset the cursor to the front/top
CLOSE CURSOR LOOP2;
OPEN CURSOR LOOP2
END LOOP;
The problem with this approach is once the outside loop moves the next value of the IDF, that logic will connect them once again, but this time with the FIDs reverse which is essentially the same thing as it does not matter the direction in which they are connected. I almost feel that once I found the link I need to remove that line from the cursor (which isn't possible).
FID1 LOW HIGH FID2 1008755360 81 82 1008756293 1008756293 81 82 1008755360 I was able to
1. make a list of all those I have connected and check against that
2 use some kind of collection
3. use a temporary table to hold the data
4 something that I have not yet thought
I really appreciate in advance for any help I get.
If your query mapping is correct, this is the result of your query with the addition of the values of sum for the strand/down running. Manually change the incorrect in the output bit numbers so that we can move on to find another solution.
with gc_count like)
Select
Sum(current_high-current_low+1) on strand_high (g3e_fid seq order partition),
Sum(current_high-current_low+1) more (partition of g3e_fid order of seq).
strand_low (current_high-current_low),
t.* from b$ gc_count t
)
Select
a.g3e_fid, a.current_designation, a.current_low, a.current_high, a.strand_high, a.strand_low,
b.g3e_fid, b.current_designation, b.current_low, b.current_high, b.strand_high, b.strand_low
gc_count a, gc_count b
where a.g3e_fid in (1008757155,1008757159,1009999655)
and in b.g3e_fid (1008757155,1008757159,1009999655)
and a.g3e_fid > b.g3e_fid
and ((a.count_annotation = b.count_annotation)
or (a.current_designation = b.current_designation
and a.current_low b.current_low and b.current_high and a.current_high between b.current_low and b.current_high)
order of b.seq
/
G3E_FID CURRENT_DESIGNATION CURRENT_LOW CURRENT_HIGH STRAND_HIGH STRAND_LOW G3E_FID CURRENT_DESIGNATION CURRENT_LOW CURRENT_HIGH STRAND_HIGH STRAND_LOW
---------- --------------------- ----------- ------------ ----------- ---------- ---------- --------------------- ----------- ------------ ----------- ----------
GAGA GAGA 1008757159 1008757155 1 1 2 2 1 2 2 1
1008757159 3 8 8 3 1008757155 3 8 8 3 F1DM F1DM
1008757159 9 10 10 9 1008757155 9 10 10 9 F2 F2
1008757159 11 14 14 11 1008757155 11 14 14 11 F1DM F1DM
1009999655 17 18 6 5 1008757155 15 18 18 15 F2 F2
1008757159 15 16 16 15 1008757155 15 18 18 15 F2 F2
1009999655 21 24 4 1 1008757155 21 24 24 21 F2 F2
7 selected lines.
Elapsed time: 00:00:00.06
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How can I add a "clickTAG" and the loop 3 times to a banner made with flash cc2014 html5 canvas?
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Rodrigo
the necessary js is the same as, except that you do not type the variables and that precede you them "this."
last image in loop:
{if(!this.alreadyExecuted)}
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}
}
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Nested loops in the XSLT handling
Hello
I want to manage nested loops for each within the transformation roadmap.
I have two collections of source and a target collection.
I have to search the value of key in source1 source2 and if the key is found, I map the value of the target, and if the key is not found, maybe I want to the key itself to target.
This is the input samples and the results expected from the transformation roadmap. Please help turn in the required format.
Entry
----------------------
------------------------
< Source1Collection >
< Group1 >
< key > < / keys >
i < value > < / value >
< / Group1 >
< Group2 >
b < Key > < / key >
II < value > < / value >
< / Group2 >
Group < 3 >
< Key > c < / keys >
III < value > < / value >
< / Group 3 >
< / Source1Collection >
---------------------------------------
< Source2Collection >
< Feild1 > z < / Feild1 >
< Feild1 > x < / Feild1 >
c < Feild1 > < / Feild1 >
< Feild1 > v < / Feild1 >
b < Feild1 > < / Feild1 >
< / Source2Collection >
----------------------------------------
Output
--------------------------------------
--------------------------------------
< TargetCollection >
< Field1 > one < / Feild1 >
b < Field1 > < / Feild1 >
III < Field1 > < / Feild1 >
< / TargetCollection >is it possible that I can keep the position of the corresponding source2Key "?" This will help me to map the corresponding value of the sourceKey2 to the target.
For something like that...
1 one 2 two 3 three You can use the following to get the value of a respective key...
Thus, when $key = '2' the expression above will return "two"...
I hope this helps...
See you soon,.
Vlad -
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.
-
Is the merge join Cartesian intensibe more CPU than nested loops?
Hello
just wonderning which access method is more intensive CPU, supposed to leave we got 2 the same rank sources and make joing via merge join Cartesian and then case is nested loop.
I know that nl can be CPU due to the tight loop access, but what abour MJC?
I can see bufferd sort but not sure is that cpu friendly?
Concerning
GregGThe simplest answer I think is "it depends on the situation." Two of them could be disaster in different situations. Nested loops are suitable for a type of join and Cartesian for another.
-
Hello
A fundamental question about Nested Loops, what is the number of rows in the inner table means (4 in this example)? This is the average number of lines that oracle had to read by loop?
Thank you.
SYS> SHOW PARAMETER optimizer_features_enable NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ optimizer_features_enable string 11.2.0.1 HR> EXEC DBMS_STATS.GATHER_TABLE_STATS (USER , 'EMPLOYEES' , CASCADE => TRUE ) PL/SQL procedure successfully completed. HR> EXEC DBMS_STATS.GATHER_TABLE_STATS (USER , 'DEPARTMENTS' , CASCADE => TRUE ) PL/SQL procedure successfully completed. HR> SELECT COUNT(*) FROM employees ; COUNT(*) ---------- 107 HR> SELECT COUNT(*) FROM departments ; COUNT(*) ---------- 27 SELECT /*+ USE_NL(e d) */ e.last_name , d.department_name FROM employees e , departments d WHERE e.department_id = d.department_id; Execution Plan ---------------------------------------------------------- Plan hash value: 2968905875 ------------------------------------------------------------------ | Id | Operation | Name | Rows | Bytes | Cost | ------------------------------------------------------------------ | 0 | SELECT STATEMENT | | 106 | 2862 | 24 | | 1 | NESTED LOOPS | | 106 | 2862 | 24 | | 2 | TABLE ACCESS FULL| DEPARTMENTS | 27 | 432 | 2 | |* 3 | TABLE ACCESS FULL| EMPLOYEES | *4* | 44 | 1 | ------------------------------------------------------------------Hello
A fundamental question about Nested Loops, what is the number of rows in the inner table means (4 in this example)? This is the average number of lines that oracle had to read by loop?
Hello
in fact, it's exactly what it is, with the exception of is not the true Oracle number was read, it is an estimate.
You can track 10053 and see how the optimizer reach these numbers. The optimizer calculates the cardinality of the join using the following formula:
cardinality (employees) * *(join selectivity) cardinality (departments).
and join selectivity is essentially 1/greater (num_distinct (departments.department_id), (departments.department_id) num_distinct), adjusted for null values (not NULL values in this particular case, so no adjustment is necessary).
If you plug the values you get for the cardinality of the join:
107 * 27 * join selectivity, which join selectivity = 1/greater(11, 27) = 1/27 = 0.036691, so 107 * 27 * 0.036 ~ = 106.
4 comes from this number by dividing the cardinality expected join (106) by the estimated number of iterations of the nested loop (27).
It is not true the optimizer assumes an even distribution here - if it did, then it should get to 11 employees by Department, not 4 (because num_distinct (employees.department_id) = 11, not 4).
If you are interested in these issues, please refer to the excellent book by Jonathan Lewis "Cost based fundamentals", is all explained quite well in there.
Best regards
Nikolai -
When oracle uses a nested loop join full?
Hello!
Oracle database uses a complete nested loop join? I mean, imagine 2 tables without any index... is there a case where Oracle made a full scan of the inner table for each row in the outer table? I know it's the original algorithm of the nested loop join, but some databases prefer to do a temp table to autoindex the internal table and never does a full scan of the inner table...
Thank you!!http://download.Oracle.com/docs/CD/B10501_01/server.920/a96533/optimops.htm#49548
is 100% clear in its language. Simply click on it.
A nested loop join involves the following steps:The optimizer determines the driving table and it designates as the outer table.
The other table is referred to as the inner table.
For each row in the outer table, Oracle access all rows from the inner table. The outer loop is for each row in the outer table, and the inner loop is for each line of the internal table. The outer loop appears before the inner loop in the execution plan, as follows:
NESTED LOOPS
outer_loop
inner_loopConcerning
Girish Sharma
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