2- برای اینکه بتوان بر روی ستون‌های مورد نظر Full text Serach زد باید index‌های لازم و همچنین کاتولوگ‌های لازم را تعریف نمود.

//ایجاد کاتالوگ 
 use AdventureWorks
 create fulltext catalog FullTextCatalog as default

 select *
 from sys.fulltext_catalogs

//تعریف ایندکس بر روی ستون  مورد نظر
 create fulltext index on Production.ProductDescription(Description)
 key index PK_ProductDescription_ProductDescriptionID

3- توجه داشته باشید برای حجم داده‌های کم قابلیت Full text Search بسیار کند و زمان بر‌تر از جست و جوهای پایه نظیر استفاده از Like می‌باشد و زمانی که حجم داده‌ها زیاد می‌باشد باید از قابلیت  Full text Search استفاده شود

4- خروجی جست وجوی Full Text Search و جست و جوی معمولی برای داده‌های زیاد یکسان نمی‌باشد ، کافی است در یک دیتا بیس با حجم بالای داده‌ها جست و جو را با هر دو روش انجام دهید ، آن وقت خواهید دید که جست و جوی سنتی (نظیر استفاده از دستور  LIKE) بسییار دقیق‌تر می‌باشد و تمامی اطلاعات خواسته شده را درست بر خواهد گرداند، امام با استفاده از Full Text Search این اطلاعات کامل نمی‌باشد! کافی است خودتان امتحان کنید 

USE [WideWorldImporters];
GO

DROP PROCEDURE IF EXISTS [Application].[usp_GetPersonInfo];
GO

CREATE PROCEDURE [Application].[usp_GetPersonInfo]
    (@PersonID INT)
AS

SELECT
    [p].[FullName],
    [p].[EmailAddress],
    [c].[FormalName]
FROM [Application].[People] [p]
    LEFT OUTER JOIN [Application].[Countries] [c]
    ON [p].[PersonID] = [c].[LastEditedBy]
WHERE [p].[PersonID] = @PersonID;
GO

IF EXISTS (
SELECT *
FROM sys.server_event_sessions
WHERE [name] = 'QueryPerf')
BEGIN
    DROP EVENT SESSION [QueryPerf] ON SERVER;
END
GO

CREATE EVENT SESSION [QueryPerf]
ON SERVER
ADD EVENT sqlserver.sp_statement_completed(
WHERE ([duration]>(1000))),
ADD EVENT sqlserver.sql_statement_completed(
WHERE ([duration]>(1000))),
ADD EVENT sqlserver.query_post_execution_showplan
ADD TARGET package0.event_file(
SET filename=N'C:\Temp\QueryPerf\test.xel',max_file_size=(256))
WITH (
MAX_MEMORY=16384 KB,EVENT_RETENTION_MODE=ALLOW_SINGLE_EVENT_LOSS,
MAX_DISPATCH_LATENCY=5 SECONDS,MAX_EVENT_SIZE=0 KB,
MEMORY_PARTITION_MODE=NONE,TRACK_CAUSALITY=ON,STARTUP_STATE=OFF);
GO

USE [master];
GO

ALTER DATABASE [WideWorldImporters] SET QUERY_STORE = ON;
GO

ALTER DATABASE [WideWorldImporters] SET QUERY_STORE (
OPERATION_MODE = READ_WRITE,
CLEANUP_POLICY = (STALE_QUERY_THRESHOLD_DAYS = 30),
DATA_FLUSH_INTERVAL_SECONDS = 60,
INTERVAL_LENGTH_MINUTES = 5,
MAX_STORAGE_SIZE_MB = 100,
QUERY_CAPTURE_MODE = ALL,
SIZE_BASED_CLEANUP_MODE = AUTO,
MAX_PLANS_PER_QUERY = 200);
GO

ALTER DATABASE [WideWorldImporters] SET QUERY_STORE CLEAR;
GO

DBCC FREEPROCCACHE;
GO

ALTER EVENT SESSION [QueryPerf]
ON SERVER
STATE = START;
GO

SET STATISTICS IO ON;
GO
SET STATISTICS TIME ON;
GO
SET STATISTICS XML ON;
GO

USE [WideWorldImporters];
GO

EXECUTE [Application].[usp_GetPersonInfo] 1234;
GO

SELECT
    [s].[StateProvinceName],
    [s].[SalesTerritory],
    [s].[LatestRecordedPopulation],
    [s].[StateProvinceCode]
FROM [Application].[Countries] [c]
    JOIN [Application].[StateProvinces] [s]
    ON [s].[CountryID] = [c].[CountryID]
WHERE [c].[CountryName] = 'United States';
GO

ALTER EVENT SESSION [QueryPerf]
ON SERVER
STATE = STOP;
GO

DROP EVENT SESSION [QueryPerf] ON SERVER;
GO

SELECT
    [qs].[last_execution_time],
    [qs].[execution_count],
    [qs].[total_elapsed_time],
    [qs].[total_elapsed_time]/[qs].[execution_count] [AvgDuration],
    [qs].[total_logical_reads],
    [qs].[total_logical_reads]/[qs].[execution_count] [AvgLogicalReads],
    [t].[text],
    [p].[query_plan]
FROM sys.dm_exec_query_stats [qs]
CROSS APPLY sys.dm_exec_sql_text([qs].sql_handle) [t]
CROSS APPLY sys.dm_exec_query_plan([qs].[plan_handle]) [p]
WHERE [t].[text] LIKE '%Countries%';
GO

USE [WideWorldImporters];
GO

SELECT
    [qsq].[query_id],
    [qst].[query_sql_text],
    CASE
WHEN [qsq].[object_id] = 0 THEN N'Ad-hoc'
ELSE OBJECT_NAME([qsq].[object_id])
END AS [ObjectName],
    [qsp].[plan_id],
    [rs].[count_executions],
    [rs].[avg_logical_io_reads],
    [rs].[avg_duration],
    TRY_CONVERT(XML, [qsp].[query_plan]),
    [rs].[last_execution_time],
    (DATEADD(MINUTE, -(DATEDIFF(MINUTE, GETDATE(), GETUTCDATE())),
[rs].[last_execution_time])) AS [LocalLastExecutionTime]
FROM [sys].[query_store_query] [qsq]
    JOIN [sys].[query_store_query_text] [qst]
    ON [qsq].[query_text_id] = [qst].[query_text_id]
    JOIN [sys].[query_store_plan] [qsp]
    ON [qsq].[query_id] = [qsp].[query_id]
    JOIN [sys].[query_store_runtime_stats] [rs]
    ON [qsp].[plan_id] = [rs].[plan_id]
WHERE [qst].[query_sql_text] LIKE '%Countries%';
GO

Transact-SQL The Building Blocks to SQL Server Programming
Published by Redgate, First Edition 2020 

Library Written in C# For Parsing SQL Server T-SQL Scripts in .Net 

Run SQL in your browser...

Supports Postgres, MySQL, SQL Server, Vertica, Crate, and Presto

FIX: High CPU usage on SQL queries after install SQL Server 2014 Service Pack 1 

2016-11-13 21:03:20  <=>  2016-11-13 21:03:21  

DateTime now = DateTime.Now;
DateTime later = now + TimeSpan.FromHours(1.0);

Assert.That( now, Is.EqualTo(now) );
Assert.That( later, Is.EqualTo(now).Within( TimeSpan.FromHours(3.0) ) );
Assert.That( later, Is.EqualTo(now).Within(3).Hours );

public static class DateTimeAssert
{
    public static void AreEqual( DateTime? expectedDate,
                                 DateTime? actualDate,
                                 TimeSpan maximum )
    {
        if ( expectedDate == null && actualDate == null )
            return;

        if ( expectedDate == null )
            throw new NullReferenceException( "The expected date was null" );

        if ( actualDate == null )
            throw new NullReferenceException( "The actual date was null" );

        var totalSecondsDifference = Math.Abs( ( actualDate.Value - expectedDate.Value ).TotalSeconds );
        if ( totalSecondsDifference > maximum.TotalSeconds )
        {
            throw new Exception( $"Expected Date: {expectedDate}, Actual Date: {actualDate} Expected: {maximum}, Total Seconds Difference: {totalSecondsDifference}" );
        }
    }
}