The main problem is that in my sp there are different objects and logic that may cause lack of performance.
The things that I see on my SP and the tables that are in use in the SP
1- Temp tables such as shown below; (2 Temp Tables)
CREATE TABLE #TEMP_TABLE(
AB INT NOT NULL,
AC INT NOT NULL,
AD INT NOT NULL,
AF INT NULL,
AG INT NULL,
REFERENCE_NUMBER INT NULL
)
CREATE NONCLUSTERED INDEX IX_1 ON #TEMP_TABLE (AB , AC, AD)
2- Insert process to the create temp table as TEMP1 in the SP
3- DROP TABLE #TEMP_TABLE
DROP TABLE #TEMP_TABLE2
in the end of the SP
4- There are two tables used to join themselves, but not all the fields that are used “on” case of JOIN operator. For instance; there are clustered index fields declared on the first table, plus date column which is not in the clustered index groups of the first table..
For short; Clustered and non clustered indexes are important ok, but in which order should i declare them. What i need from which index type, tell me the order of cretation of indexes for further use of JOIN process etc.
5- Should I use table variable instead of temp table. Ok it will be better but there are lots of question mark that does not let me to use the table variables..
*An INSERT into a table variable will not take advantage of parallelism.
ref->
6- I heard about logical reads. Should i really take care about these numbers.
The details of an example data’s results are shown below (*)
7- The execution plan…
*OUTPUT:
Table ‘CHANNEL’. Scan count 0, logical
reads 2, physical reads 0, read-ahead
reads 0, lob logical reads 0, lob
physical reads 0, lob read-ahead reads
0. Table ‘XYZ_DATE’. Scan count 1, logical reads 2, physical reads 0,
read-ahead reads 0, lob logical reads
0, lob physical reads 0, lob
read-ahead reads 0. Table
‘XYZ01’. Scan count 3171,
logical reads 13135, physical reads
153, read-ahead reads 0, lob logical
reads 0, lob physical reads 0, lob
read-ahead reads 0. Table
‘XYZ02’. Scan count
5, logical reads 51256, physical reads
0, read-ahead reads 0, lob logical
reads 0, lob physical reads 0, lob
read-ahead reads 0. Table
‘#TEMP_TABLE_________________________________________________________________________________________________________000000000840’. Scan count 0, logical reads 97,
physical reads 0, read-ahead reads 0,
lob logical reads 0, lob physical
reads 0, lob read-ahead reads 0. Table
‘Worktable’. Scan count 0, logical
reads 0, physical reads 0, read-ahead
reads 0, lob logical reads 0, lob
physical reads 0, lob read-ahead reads
0.(32 row(s) affected) Table
‘#TEMP_TABLE2________________________________________________________________________________________________________000000000841′. Scan count 0, logical reads 64,
physical reads 0, read-ahead reads 0,
lob logical reads 0, lob physical
reads 0, lob read-ahead reads 0. Table
”XYZ03’. Scan count 0,
logical reads 107, physical reads 0,
read-ahead reads 0, lob logical reads
0, lob physical reads 0, lob
read-ahead reads 0. Table ”XYZ04”.
Scan count 32, logical reads 129,
physical reads 0, read-ahead reads 0,
lob logical reads 0, lob physical
reads 0, lob read-ahead reads 0. Table
‘#TEMP_TABLE_________________________________________________________________________________________________________000000000840’. Scan count 1, logical reads 1,
physical reads 0, read-ahead reads 0,
lob logical reads 0, lob physical
reads 0, lob read-ahead reads 0.(21 row(s) affected)
(21 row(s) affected) Table
‘XYZ05’. Scan count 0,
logical reads 87, physical reads 0,
read-ahead reads 0, lob logical reads
0, lob physical reads 0, lob
read-ahead reads 0. Table
‘XYZ01A’. Scan count 21, logical
reads 147, physical reads 0,
read-ahead reads 0, lob logical reads
0, lob physical reads 0, lob
read-ahead reads 0. Table ‘XYZ04’.
Scan count 0, logical reads 84,
physical reads 0, read-ahead reads 0,
lob logical reads 0, lob physical
reads 0, lob read-ahead reads 0. Table
‘#TEMP_TABLE2________________________________________________________________________________________________________000000000841’. Scan count 1, logical reads 1,
physical reads 0, read-ahead reads 0,
lob logical reads 0, lob physical
reads 0, lob read-ahead reads 0.
(*)
I did put some indexes then scans are doing seek..
now it is better.
still doing performance tests:
follow here-> Testing Stored Procedure performance