Fired and for all costs in bulk
Hi allI need to get 500000 lines of a table and apply logic to each line and insert the result into another table.
Currently, I'm trying with COLLECT in BULK. To improve performance there is any other alternative...
Can we improve as well as BULK collect. Please suggest with examples...
Thank you and best regards,
Sri
user12023859 wrote:
As suggested by you, I deleted all select them iteration in bulk and I could see the performance improvement. I always use PL/SQL to convert line values to the values of columns. I get my cursor to input data in the rows.
You are still doing a nested SELECT statement (just now through explicit cursors).
Extract a line of account, and then you open a cursor (SQL) for the balance and then treat that. You do exactly what does the SQL engine in a nested loops join. Only, your code can never be as fast and efficient as the SQL engine in this regard.
Which begs the question: why manually join accounts whose balances using PL/SQL code? Why don't you use SQL to join the two tables instead?
All of the PL/SQL code must be replaced by the following SQL statement:
insert into balance_due
select
.. SQL logic using CASE statements...
from cmf,
balances,
cost_centres
where ..predicates..
And then this code will be used in PL/SQL and followed by a validation. That's all. Simple, effective, fast and scalable code.
You must optimize SQL and PL/SQL to minimize for performance. SQL is superior than PL/SQL, when it comes to crunch data. Use only PL/SQL to deal with flow control process, under condition of logical flow and so on - SQL allows to process the data.
Pulling data from the SQL engine in the PL engine (despite that collect the essential) is still of the line treatment... treatment aka slow-by-slow.
SQL is a language very powerful and able to process the data from the database. PL is not.
Tags: Database
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==================
SQL > @d:/bulk_insert.sql.
starts at: 1084934013
has completed at: 1084972317
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1084972317 1084934013
---------------------
38304
(2) using the Insert statement
duration for the insert scriptDeclare begin_time number; end_time number; Begin select (dbms_utility.get_time) into begin_time from dual; dbms_output.put_line('started at : '||begin_time); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('36501', '100CFL3092811385'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('106501', '100CFL3092811108'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('172501', '100SFL1092810013'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('192501', '100SVL2092814600'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('212501', '100SVL2092814181'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('272501', '100AFL309281B2LZ'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('292501', '100AVL2092812200'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('332501', '100SVL2092814599'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('346501', '100AFL309281B2LY'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('372501', '100SVL2092814598'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('382501', '100IVL1092811512'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('422501', '100SFL1092810020'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('432501', '100IVL1092811447'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('462501', '100CFL3092811107'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('492501', '100SVL2092814245'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('542501', '100AVL2092812530'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('592501', '100CFL3092811105'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('612501', '100SVL2092814242'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('632501', '100CFL3092811384'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('712501', '100PVL2092813321'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('722501', '100PVL2092813311'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('732501', '100PVL2092813341'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('742501', '100PVL2092813319'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('752501', '100PVL2092813308'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('762501', '100PVL2092813338'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('772501', '100PVL2092813316'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('782501', '100PVL2092813305'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('786501', '100CFL2092810051'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('792501', '100PVL2092813335'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('802501', '100PVL2092813313'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('812501', '100PVL2092813302'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('822501', '100PVL2092813332'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('832501', '100PVL2092813310'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('852501', '100PVL2092813329'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('862501', '100PVL2092813307'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('872501', '100PVL2092813299'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('882501', '100PVL2092813326'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('922501', '100PVL2092813304'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('932501', '100PVL2092813296'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('952501', '100PVL2092813300'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('962501', '100PVL2092813293'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('972501', '100PVL2092813323'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('982501', '100PVL2092813297'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('1002501', '100PVL2092813320'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('1012501', '100PVL2092813294'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('1022501', '100PVL2092813290'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('1032501', '100PVL2092813317'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('1042501', '100PVL2092813291'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('1052501', '100PVL2092813287'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('1062501', '100PVL2092813315'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('1072501', '100PVL2092813288'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('1082501', '100AFL309281B2LX'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('1092501', '100PVL2092813312'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('1102501', '100PVL2092813285'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('1112501', '100PVL2092813284'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('1122501', '100PVL2092813309'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('1142501', '100PVL2092813281'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('1152501', '100PVL2092813306'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('1162501', '100PVL2092813282'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('1166501', '100CFL3092811383'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('1212501', '100IVL1092811445'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('1232501', '100IVL1092811526'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('1272501', '100IVL1092811441'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('1292501', '100IVL1092811523'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('1302501', '100PVL2092813303'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('1312501', '100PVL2092813279'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('1322501', '100PVL2092813278'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('1332501', '100PVL2092813301'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('1342501', '100PVL2092813276'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('1352501', '100PVL2092813275'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('1376501', '100AFL309281B2LW'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('1382501', '100PVL2092813272'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('1392501', '100PVL2092813298'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('1402501', '100PVL2092813273'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('1412501', '100PVL2092813269'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('1446501', '100RNF6092810019'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('1452501', '100IVL1092811436'); insert into r_dummy (HOGAN_REFERENCE_NUMBER, FLEXCUBE_REFERENCE_NUMBER) values ('1492501', '100CFL3092811382'); select (dbms_utility.get_time) into end_time from dual; dbms_output.put_line('ended at : '||end_time); Exception When Others Then dbms_output.put_line('Exception Occured '||sqlerrm); rollback; End; /
====================
I waz impossible of past all of the code... He has almost 13851 records. Please suggest me the best option, and if there is another way to achieve this.SQL> @@d:/insert_bhanu.sql started at : 1084984928 ended at : 1084988401 PL/SQL procedure successfully completed. SQL> select 1084988401 - 1084984928 from dual; 1084988401-1084984928 --------------------- 3473
I need to provide a solution optimized to my clients.
Concerning
Rambeau.792353 wrote:
I have two sql scripts. Having just insert statements and the other using bulk insert both do the same thing.
Not really valid for the purposes of comparison.
The fundamental question is what makes in bulk for faster processing. It is a well-known and easily answered--reduction in context switches between SQL and PL/SQL engines. And that's all. Nothing more and nothing magical.
The easiest way to show this difference is to eliminate all other factors - especially I/O as a trial may be at a disadvantage by the physical i/o, while the comparison test can be promoted by e/s logic. Another factor that must be eliminated is extra unnecessary SQL that adds more overhead (such as the use of DOUBLE and unions) and so on.
Remember that it is critical for the reference driver to compare like with like and eliminate all other factors. As simplistic as maybe keep it. For example, something like the following:
SQL> create table foo_table( id number ); Table created. SQL> var iterations number SQL> exec :iterations := 10000; PL/SQL procedure successfully completed. SQL> SQL> declare 2 t1 timestamp with time zone; 3 begin 4 dbms_output.put_line( 'bench A: hard parsing, normal delete' ); 5 t1 := systimestamp; 6 for i in 1..:iterations 7 loop 8 execute immediate 'delete from foo_table where id = '||i; 9 end loop; 10 dbms_output.put_line( systimestamp - t1 ); 11 end; 12 / bench A: hard parsing, normal delete +000000000 00:00:07.639779000 PL/SQL procedure successfully completed. SQL> SQL> declare 2 t1 timestamp with time zone; 3 begin 4 dbms_output.put_line( 'bench B: soft parsing, normal delete' ); 5 t1 := systimestamp; 6 for i in 1..:iterations 7 loop 8 delete from foo_table where id = i; 9 end loop; 10 dbms_output.put_line( systimestamp - t1 ); 11 end; 12 / bench B: soft parsing, normal delete +000000000 00:00:00.268915000 PL/SQL procedure successfully completed. SQL> SQL> declare 2 type TNumbers is table of number; 3 t1 timestamp with time zone; 4 idList TNumbers; 5 begin 6 dbms_output.put_line( 'bench C: soft parsing, bulk delete' ); 7 idList := new TNumbers(); 8 idList.Extend( :iterations ); 9 10 for i in 1..:iterations 11 loop 12 idList(i) := i; 13 end loop; 14 15 t1 := systimestamp; 16 forall i in 1..:iterations 17 delete from foo_table where id = idList(i); 18 dbms_output.put_line( systimestamp - t1 ); 19 end; 20 / bench C: soft parsing, bulk delete +000000000 00:00:00.061639000 PL/SQL procedure successfully completed. SQL>Why an empty table? Eliminates potential problems with the physical versus logical I/O. Why a delete and not Insertstatement? The same reason.
The foregoing shows how slow hard analysis is clear. It has the advantage of soft analysis. It has the advantage of reducing the change of context, at the expense of additional memory - as bench 3 consumes much more memory (PGA) that other points of reference.
Also note that these marks the exact same delete SQL statements - using different approaches. Where the approach only (and not the SQL) made the difference. This means that we can draw valid conclusions on each of these approaches.
Can we say the same thing with the scripts you used to "show" that the treatment bulk is apparently slow?
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