is this query optimized? - sql-server

Question

i got task to optimize the database, because this database has slow response.
is this possible, if i have around 90k records, if i want to select around 27k records, the responses time is 15s?
anything wrong with my query? or this is about indexes?
SET NOCOUNT ON;
SELECT workID AS pageID,
projectName AS recProject,
workType AS recType,
workTitle AS recTitle,
workDescription,
workDate AS recDate,
startTime,
endTime,
RTRIM(LTRIM(firstName + ' ' + lastName)) AS recName
FROM dbo.vTimesheets WITH (NOLOCK)
WHERE isActiveProject = 1
AND workType = 1
AND timeFor = 2
ORDER BY recdate DESC, pageID DESC;
SET NOCOUNT OFF;
this query for view
SELECT dbo.tblTimesheet.workID,
dbo.tblTimesheet.staffID,
dbo.tblTimesheet.workDate,
dbo.tblTimesheet.startTime,
dbo.tblTimesheet.endTime,
dbo.tblTimesheet.projectID,
dbo.tblTimesheet.timeFor,
dbo.tblTimesheet.workType,
dbo.tblTimesheet.workTitle,
dbo.tblTimesheet.workDescription,
dbo.tblProject.projectName,
dbo.tblProject.isDeleted AS isDeletedProject,
dbo.tblProject.isActive AS isActiveProject,
dbo.tblUser.firstName,
dbo.tblUser.lastName,
dbo.tblUser.isDeleted AS isDeletedStaff,
dbo.tblUser.staffType
FROM dbo.tblTimesheet WITH (NOLOCK)
INNER JOIN dbo.tblUser WITH (NOLOCK) ON dbo.tblTimesheet.staffID = dbo.tblUser.userID
INNER JOIN dbo.tblProject WITH (NOLOCK) ON dbo.tblTimesheet.projectID = dbo.tblProject.projectID
WHERE (dbo.tblTimesheet.isDeleted = 0)

Answer 1

ALTER TABLE dbo.tblTimesheet
ADD workDescription2 AS CAST(workDescription AS VARCHAR(MAX))
GO
CREATE INDEX ix ON dbo.tblTimesheet (projectID, staffID, workDate DESC, workID DESC)
INCLUDE (startTime, endTime, workType, workTitle, workDescription2, timeFor, isDeleted)
WHERE isDeleted = 0 AND workType = 1 AND timeFor = 2
--WITH (DROP_EXISTING=ON)
SELECT t.workID AS pageID,
t.workDate AS recDate,
t.startTime,
t.endTime,
t.workType AS recType,
t.workTitle AS recTitle,
t.workDescription2 AS workDescription,
p.projectName AS recProject,
RTRIM(LTRIM(u.firstName + ' ' + u.lastName)) AS recName
FROM dbo.tblTimesheet t --WITH (INDEX (ix))
JOIN dbo.tblUser u ON t.staffID = u.userID
JOIN dbo.tblProject p ON t.projectID = p.projectID
WHERE t.isDeleted = 0
AND p.isActive = 1
AND t.workType = 1
AND t.timeFor = 2
ORDER BY t.workDate DESC, t.workID DESC
this is the new execution plan
but this slower than before

Answer 2

CREATE INDEX ix1 ON dbo.tblTimesheet (projectID, staffID, workID)
INCLUDE (workType, timeFor, isDeleted)
WHERE isDeleted = 0 AND workType = 1 AND timeFor = 2
IF OBJECT_ID('tempdb.dbo.#temp') IS NOT NULL
DROP TABLE #temp
CREATE TABLE #temp (
workID INT PRIMARY KEY,
recProject VARCHAR(50),
recName VARCHAR(150)
)
INSERT INTO #temp (workID, recProject, recName)
SELECT t.workID,
p.projectName,
RTRIM(LTRIM(u.firstName + ' ' + u.lastName)) AS recName
FROM dbo.tblTimesheet t WITH (INDEX (ix1))
JOIN dbo.tblUser u ON t.staffID = u.userID
JOIN dbo.tblProject p ON t.projectID = p.projectID
WHERE t.isDeleted = 0
AND p.isActive = 1
AND t.workType = 1
AND t.timeFor = 2
SELECT t.workID AS pageID,
t.workDate AS recDate,
t.startTime,
t.endTime,
1 AS recType,
t.workTitle AS recTitle,
t.workDescription,
tt.recProject,
tt.recName
FROM dbo.tblTimesheet t
JOIN #temp tt ON t.workID = tt.workID
ORDER BY t.workDate DESC, t.workID DESC
--OPTION(RECOMPILE)