스칼라 함수가 저장 프로 시저에서 사용하는 동안 SQL Server에서 요청 시간 제한 문제가 발생합니다.

Question

이것은 salar fuction입니다. 나는 이것을 muliple 매개 변수로 저장 프로 시저에서 사용하고 있습니다. 작은 결과를 얻으려면 좋지만 큰 데이터의 경우 시간이 초과되고 긴 실행 시간이 필요합니다. 다른 대체 또는 일부 개선 사항을 공유하십시오.

ALTER FUNCTION [dbo].[FNGETMULIPLEASSIGNESS_NEW2] 
(
    @TIMELINEID INT, 
    @MILSTONEID INT, 
    @TASKID INT 
) 

RETURNS varchar(max) 
AS 
    BEGIN 
     DECLARE @Assignees varchar(max)='', @isExists bit=0 
    if(@TASKID=0) 
     BEGIN 
     Select @Assignees = @Assignees+ FIRSTNAME +' ' + LASTNAME+', ' 
      FROM CASETIMELINEPEOPLE 
      INNER JOIN USERDETAIL ON 
      CASETIMELINEPEOPLE.PEOPLEUSERID=USERDETAIL.USERID 
      WHERE (CASETIMELINEID= @TIMELINEID) AND 
      (TEMPLATEMILESTONEID=@MILSTONEID) AND 
      (TEMPLATETASKID is null) and CASETIMELINEPEOPLE.isdeleted=0 
    END 

    else 

     BEGIN 
      Select @Assignees = @Assignees+ FIRSTNAME +' ' + LASTNAME+',' 
      FROM CASETIMELINEPEOPLE 
      INNER JOIN USERDETAIL ON 
      CASETIMELINEPEOPLE.PEOPLEUSERID=USERDETAIL.USERID 
      WHERE (CASETIMELINEID= @TIMELINEID) AND 
      (TEMPLATEMILESTONEID=@MILSTONEID) AND 
      (TEMPLATETASKID=@TASKID) and CASETIMELINEPEOPLE.isdeleted=0 

     END 

     SELECT @Assignees=SUBSTRING(@Assignees, 0,LEN(@Assignees)) 
     RETURN @Assignees 
END 

Answer 1

인라인 테이블 값 함수를 사용하면 성능이 향상됩니다.

참조 :

• When is a SQL function not a function? "If it’s not inline, it’s rubbish." - Rob Farley
• Inline Scalar Functions - Itzik Ben-Gan
• Scalar functions, inlining, and performance: An entertaining title for a boring post - Adam Machanic
• TSQL User-Defined Functions: Ten Questions You Were Too Shy To Ask - Robert Sheldon
여기

---

이 스칼라 함수 t의 인라인 테이블 값 함수 버전입니다 모자는 stuff() with select ... for xml path ('') method of string concatenation 사용합니다.

create function dbo.fn_get_multiple_assigness_itvf (
    @timelineid int 
    , @milstoneid int 
    , @taskid int 
) returns table as return (
select Assignees = stuff((
    select ',' + firstname + ' ' + lastname 
    from casetimelinepeople ctp 
     inner join userdetail ud 
     on ctp.peopleuserid=ud.userid 
    where casetimelineid = @timelineid 
     and templatemilestoneid = @milstoneid 
     and (templatetaskid = @taskid 
     or (@taskid = 0 and templatetaskid is null) 
     ) 
     and ctp.isdeleted=0 
    for xml path (''), type).value('.','nvarchar(max)') 
    ,1,1,'') 
) 
go 

rextester 데모 : http://rextester.com/UZTJS46485

테스트 설정 :

create table casetimelinepeople (
    casetimelineid int 
    , peopleuserid int 
    , templatemilestoneid int 
    , templatetaskid int 
    , isdeleted bit not null default 0 
); 
insert into casetimelinepeople values 
(1,1,1,null,0) 
,(1,2,1,null,0) 
,(1,3,1,null,0) 
,(1,2,1,1,0) 
,(1,3,1,1,0) 

create table userdetail (
    userid int not null 
    , firstname varchar(32) not null 
    , lastname varchar(32) not null); 
insert into userdetail values 
(1, 'Some', 'One') 
,(2, 'Avinash', 'Raikwar') 
,(3, 'Sql','Zim'); 
go 

그리고 인라인 테이블을 쿼리 반환 함수 그래서 같은 :

select * 
from dbo.fn_get_multiple_assigness_itvf(1,1,0) 

반환

012 3,516,

+----------------------------------+ 
|   Assignees    | 
+----------------------------------+ 
| Some One,Avinash Raikwar,Sql Zim | 
+----------------------------------+ 

---

select * 
from dbo.fn_get_multiple_assigness_itvf(1,1,1) 

반환 :

+-------------------------+ 
|  Assignees  | 
+-------------------------+ 
| Avinash Raikwar,Sql Zim | 
+-------------------------+ 

---

쿼리의 각 행에 대해 함수를 호출 할 cross apply() 사용 :

select * 
from casetimelinepeople ctp 
    cross apply dbo.fn_get_multiple_assigness_itvf(
     ctp.casetimelineid 
    , ctp.templatemilestoneid 
    , ctp.templatetaskid 
    ) x 

반환 :

+----------------+--------------+---------------------+----------------+-----------+----------------------------------+ 
| casetimelineid | peopleuserid | templatemilestoneid | templatetaskid | isdeleted |   Assignees    | 
+----------------+--------------+---------------------+----------------+-----------+----------------------------------+ 
|    1 |   1 |     1 | NULL   | False  | Some One,Avinash Raikwar,Sql Zim | 
|    1 |   2 |     1 | NULL   | False  | Some One,Avinash Raikwar,Sql Zim | 
|    1 |   3 |     1 | NULL   | False  | Some One,Avinash Raikwar,Sql Zim | 
|    1 |   2 |     1 | 1    | False  | Avinash Raikwar,Sql Zim   | 
|    1 |   3 |     1 | 1    | False  | Avinash Raikwar,Sql Zim   | 
+----------------+--------------+---------------------+----------------+-----------+----------------------------------+