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SQL Server 2014 Hosting Italy - HostForLIFE.eu :: How to Check SQL Server CPU usage?

clock February 26, 2015 06:50 by author Peter

There are some condition & times once SQL Server CPU usage exceeds threshold value (ex 80th or more) and keep constant even until 100 percent for a undefined duration. A DBA don't get notified mechanically concerning performance degrade till its according by application team or service desk.

This typically happens once all in explosive unannounced application work goes to SQL Server for processing; but at smart range of times, it’s as a result of some T-SQL Queries are taking longer than expected or as a result of bad execution plan or block. There is also a lot of reason to add, but ultimately high processor usage on production systems goes to harm performance.

Given below could be a script that you simply will convert into stored procedure and call from SQL Server agent job, regular for each five minutes or additional to ascertain CPU usage on a vital info server. This script uses sys.dm_os_ring_buffers to spot CPU usage from last five minutes and if average CPU usage goes beyond 80th then send an alert email together with top 50 CPU consuming SQL sessions and details. And now change the 3rd code line to: SELECT @TimeNow = cpu_ticks / (cpu_ticks/ms_ticks) from sys.dm_os_sys_info

SCRIPT
SET NOCOUNT ON
DECLARE @TimeNow bigint
SELECT @TimeNow = cpu_ticks / convert(float, ms_ticks) from sys.dm_os_sys_info
-- Collect Data from DMV
Select record_id, dateadd(ms, -1 * (@TimeNow - [timestamp]),
GetDate())EventTime, SQLSvcUtilization, SystemIdle,
(100 - SystemIdle - SQLSvcUtilization) AS OtherOSProcessUtilization into #tempCPURecords
from ( select record.value('(./Record/@id)[1]', 'int')record_id, record.value('(./Record/SchedulerMonitorEvent/SystemHealth/SystemIdle)[1]','int')SystemIdle, record.value('(./Record/SchedulerMonitorEvent/SystemHealth/ProcessUtilization)[1]','int')SQLSvcUtilization,
timestamp
from ( select timestamp, convert(xml, record)record
from sys.dm_os_ring_buffers
where ring_buffer_type = N'RING_BUFFER_SCHEDULER_MONITOR'
and record like '%<SystemHealth>%')x )y  order by record_id desc
-- To send detailed sql server session reports consuming high cpu
-- For a dedicated SQL Server you can monitor 'SQLProcessUtilization'
-- if (select avg(SQLSvcUtilization) from #temp where EventTime>dateadd(mm,-5,getdate()))>=80
-- For a Shared SQL Server you can monitor 'SQLProcessUtilization'+'OtherOSProcessUtilization'
if (select avg(SQLSvcUtilization+OtherOSProcessUtilization)
from #tempCPURecords where EventTime>dateadd(mm,-5,getdate()))>=80
begin
print 'CPU Alert Condition Ture, Sending Email..'
DECLARE @tableHTML  NVARCHAR(MAX) ;
SET @tableHTML =
    N'<H1>High CPU Utilization Reported</H1>' +
    N'<H2>SQL Server Session Details</H2>' +
    N'<table border="1">' +
    N'<tr><th>SPID</th><th>Status</th><th>Login</th><th>Host</th><th>BlkBy</th>'+
   N'<th>DatabaseID</th><th>CommandType</th><th>SQLStatement</th><th>ElapsedMS</th>'+
   N'<th>CPUTime</th><th>IOReads</th><th>IOWrites</th><th>LastWaitType</th>'+
N'<th>StartTime</th><th>Protocol</th><th>ConnectionWrites</th>'+
N'<th>ConnectionReads</th><th>ClientAddress</th><th>Authentication</th></tr>'+
CAST ( ( SELECT  TOP 50 -- or all by using *
td= er.session_id,'',
td= ses.status,'',
td= ses.login_name,'', 
td= ses.host_name,'',  
td= er.blocking_session_id,'', 
td= er.database_id,'', 
td= er.command,'', 
td= st.text,'', 
td= er.total_elapsed_time,'', 
td= er.cpu_time,'', 
td= er.reads,'', 
td= er.writes,'', 
td= er.last_wait_type,'', 
td= er.start_time,'', 
td= con.net_transport,'', 
td= con.num_writes,'', 
td= con.num_reads,'', 
td= con.client_net_address,'', 
td= con.auth_scheme,'' 
FROM sys.dm_exec_requests er 
OUTER APPLY sys.dm_exec_sql_text(er.sql_handle) st 
LEFT JOIN sys.dm_exec_sessions ses 
ON ses.session_id =er.session_id  LEFT JOIN sys.dm_exec_connections con 
ON con.session_id = ses.session_id 
WHERE er.session_id > 50 
ORDER BY er.cpu_time DESC ,er.blocking_session_id
FOR XML PATH('tr'), TYPE
)AS NVARCHAR(MAX))+
N'</table>'
-- Change SQL Server Email notification code here
EXEC msdb.dbo.sp_send_dbmail
@recipients='dk@sqlknowledge',
@profile_name = 'SQLProfileName',   
@subject = 'ServerName:Last 5 Minutes Avg CPU Utilization Over 80%',
@body = @tableHTML,
@body_format = 'HTML';
END
-- Drop the Temporary Table
DROP Table #tempCPURecords

HostForLIFE.eu SQL Server 2014 Hosting
HostForLIFE.eu is European Windows Hosting Provider which focuses on Windows Platform only. We deliver on-demand hosting solutions including Shared hosting, Reseller Hosting, Cloud Hosting, Dedicated Servers, and IT as a Service for companies of all sizes. We have customers from around the globe, spread across every continent. We serve the hosting needs of the business and professional, government and nonprofit, entertainment and personal use market segments.



SQL 2014 Hosting Italy - HostForLIFE.eu :: Change Primary Key Column for Existing Table with MSSQL

clock February 24, 2015 05:04 by author Peter

In this post, I will tell you how to change primary key column for existing table in MSSQL 2014. First, you must create table User_Details with the code below:

CREATE TABLE [dbo].[Users_Details](
            [Username] [nchar](20) NOT NULL,
            [Password] [nchar](20) NOT NULL,
            [Email] [nchar](30) NULL,
            [Mobile] [nchar](15) NULL,
            [Address] [nchar](100) NULL,
            [USER_ID] [int] IDENTITY(1,1) NOT NULL,
            [Gender] [varchar](15) NULL,
            [Country] [varchar](50) NULL,
    CONSTRAINT [PK_Username] PRIMARY KEY CLUSTERED
    (
            [Username] ASC
    )
    )

And the change the column as
ALTER TABLE Users_details
ALTER COLUMN USERname NVARCHAR(100)

Now, Run it. It will show the error. Because Username column contains Primary Key.
Msg 5074, Level 16, State 1, Line 1
The object 'PK_Username' is dependent on column 'Username'.
Msg 4922, Level 16, State 9, Line 1
ALTER TABLE ALTER COLUMN Username failed because one or more objects access this column.

First Drop the Primary Key Constraint and alter table and add  Primary Key Constraint
ALTER TABLE Users_Details
DROP CONSTRAINT PK_Username
ALTER TABLE Users_Details
ALTER COLUMN Username NVARCHAR(100) NOT NULL
ALTER TABLE Users_Details
DD CONSTRAINT PK_Username PRIMARY KEY(Username)


Hope this tutorial works for you!

HostForLIFE.eu SQL Server 2014 Hosting
HostForLIFE.eu is European Windows Hosting Provider which focuses on Windows Platform only. We deliver on-demand hosting solutions including Shared hosting, Reseller Hosting, Cloud Hosting, Dedicated Servers, and IT as a Service for companies of all sizes. We have customers from around the globe, spread across every continent. We serve the hosting needs of the business and professional, government and nonprofit, entertainment and personal use market segments.



European ASP.NET Hosting - UK :: Simple ASP Script to Send Email Using ASPEmail

clock February 23, 2015 07:22 by author Scott

Simple ASP Script to send mail using AspEmail

The following is a very basic script to send a mail from an .asp page (we will build on this mail in the next scripting example to retrieve and e-mail information from a form). Note that lines starting ' are explanatory only - these lines are not parsed by the server.

<%

' First Step is to create the AspEmail message object
Set Mail = Server.CreateObject("Persits.MailSender")

' Set the from address - replace value within the quotes with your own
Mail.From = "me@yourdomain.com"

' Add the e-mail recipient address - again replace value within the quotes with your own
Mail.AddAddress "you@yourdomain.com"

' Set the subject for the e-mail
Mail.Subject = "Test mail via AspEmail"

' Create the body text for the e-mail
Mail.Body = "This mail was sent via AspEmail"

' The mail server requires that we authenticate so supply username and password
Mail.Username = "me@yourdomain.com"
Mail.Password = "your_password"

' The e-mail is now ready to go, we just need to specify the server and send
Mail.Host = "smtp.hostforlife.eu"
Mail.Send

' Mail is sent - tidy up and delete the AspEmail message object
Set Mail = Nothing

%>

That's it - you just need to substitute your own values where required and you should be able to copy this script to your account and send your first e-mail.

Note that as we use authentication the 'Mail.From' e-mail address must be a live user on our mailserver and should match the address used for the 'Mail.Username'.

 



Node.js Hosting Netherlands - HostForLIFE.eu :: Stream a Large File using Node.js

clock February 12, 2015 05:46 by author Peter

Node.js is an open source, cross-platform runtime environment for server-side and networking applications. Node.js applications are written in JavaScript, and might be run within the Node.js runtime on OS X, Microsoft Windows, Linux and FreeBSD. Node.js provides an event-driven architecture and a non-blocking I/O API that optimizes an application's outturn and measurability. These technologies are normally used for real-time applications.

Node.js uses the Google V8 JavaScript engine to execute code, and an oversized percentage of the fundamental modules are written in JavaScript. Node.js contains a intrinsic  library to permit applications to act as an internet server while not software like Apache HTTP Server or IIS.
var http = require('http');
var fs = require('fs');
http.createServer(function(req, res) {
    var newFile = fs.createWriteStream("x.wmv");
    var fileBytes = req.headers['content-length'];
    var uploadedBytes = 0;
    req.pipe(newFile);
    req.on('data', function(chunk) {
        uploadedBytes += chunk.length;
        var progress = (uploadedBytes / fileBytes) * 100;
        res.write("progress:" + parseInt(progress, 10) + "\n");
    });
    res.write("Done");
}).listen(8888);

HostForLIFE.eu Node.js Hosting
HostForLIFE.eu is European Windows Hosting Provider which focuses on Windows Platform only. We deliver on-demand hosting solutions including Shared hosting, Reseller Hosting, Cloud Hosting, Dedicated Servers, and IT as a Service for companies of all sizes. We have customers from around the globe, spread across every continent. We serve the hosting needs of the business and professional, government and nonprofit, entertainment and personal use market segments.



SQL Server 2014 Hosting - HostForLIFE.eu :: Encryption with SQL Server: HASHBYTES Function

clock February 10, 2015 08:37 by author Peter

Not all cipher texts area unit needed to be regenerate back to plain texts. ideal is "passwords". All we want with non reversible encryption is, store them in encrypted format and perform comparison once needed. What's the most effective method of implementing this with MSSQL 2014?

SQL Server provides variety of functions that may be used for encrypting plain texts using totally different mechanisms. Most of the functions enable you to write and so rewrite them back to plain text. Examples for these functions are "ENCRYPTBYKEY" and "ENCRYPTBYCERT". If decryption isn't needed or the requirment is non reversible encryption, then the most effective function to be used is "HASHBYTES".

HASHBYTES returns the hash of given clear text supported the algorithm used. Algorithms supported are: MD2, MD4, and MD5 (128 bits (16 bytes)); SHA and SHA1 (160 bits (20 bytes)); SHA2_256 (256 bits (32 bytes)), and SHA2_512 (512 bits (64 bytes)). SHA2_256 and SHA2_512 available only with SQL Server 2012 and higher than.

Though we've been given several algorithms for this, most of them are vulnerable for many attacks and not thought-about as secured cryptography algorithm. Some of them a number of identified to "collisions" that generate same output for various inputs. If you're using a version before 2012, best is SHA1 even though it's been marked for "collisions". If the version of SQL Server is 2012 or higher than, best is either SHA2_256 or SHA2_512.

Here could be a sample code that shows the usage of HASHBYTES;
-- Creating table
IF OBJECT_ID('dbo.UserCredential', 'U') IS NOT NULL
 DROP TABLE dbo.UserCredential
GO
CREATE TABLE dbo.UserCredential
(
 UserId int identity(1,1) PRIMARY KEY
 , UserName varchar(20) NOT NULL
 , Password binary(64) NOT NULL
)
GO
-- Inserting records
INSERT INTO dbo.UserCredential
 (UserName, Password)
VALUES
 ('Peter', HASHBYTES('SHA2_512', 'Pa$$w0rd'))
 , ('Scott', HASHBYTES('SHA2_512', 'P@$$w0rD'))
-- Checking records inserted
SELECT * FROM dbo.UserCredential;

Since the cipher text cannot be reverted back with HASHBYTES, here is the way of doing the comparison.
-- Validating user
IF EXISTS (SELECT * FROM dbo.UserCredential
   WHERE UserName = 'Peter'
    AND Password = HASHBYTES('SHA2_512', 'P@$$w0rD'))
 Print 'User authenticated'
ELSE
 Print 'Invalid user!'

HostForLIFE.eu SQL Server 2014 Hosting
HostForLIFE.eu is European Windows Hosting Provider which focuses on Windows Platform only. We deliver on-demand hosting solutions including Shared hosting, Reseller Hosting, Cloud Hosting, Dedicated Servers, and IT as a Service for companies of all sizes. We have customers from around the globe, spread across every continent. We serve the hosting needs of the business and professional, government and nonprofit, entertainment and personal use market segments.



SQL Server 2014 Hosting Italy - HostForLIFE.eu :: How to Split & Convert Comma Separated String in SQL Server 2014?

clock February 5, 2015 05:49 by author Peter

In this post, I will explain you about Split and convert Comma Separated String. In this article I will explain with example code, how to split and convert a comma separated / delimited string to a table using Split function in SQL Server 2005, 2008, 2012 and MSSQL 2014 versions. The string containing words or letters or numbers separated (delimited) by comma or underscore or  plus(+) ,etc,. are going to be split into Table values.

I will conjointly explain a way to use the Split function to separate a string in an exceedingly SQL query or stored Procedures in SQL Server 2005, 2008 and 2012 versions. And here is the code that I used:
CREATE FUNCTION [dbo].[SplitString] (@InputString NVARCHAR(MAX),@delimiter CHAR(1))
RETURNS @tbl TABLE (
  Item NVARCHAR(50) NOT NULL
)
AS
BEGIN
  DECLARE @StartIndex int,
          @NextIndex int,
          @ItemLen int
  SELECT
    @StartIndex = 0,
    @NextIndex = 1
  WHILE @NextIndex > 0
  BEGIN
    SELECT
      @NextIndex = CHARINDEX(@delimiter, @InputString, @StartIndex + 1)
    SELECT
      @ItemLen =
                CASE
                  WHEN @NextIndex > 0 THEN @NextIndex
                  ELSE LEN(@InputString) + 1
                END - @StartIndex – 1
    INSERT @tbl (Item)
      VALUES (CONVERT(varchar(50), SUBSTRING(@InputString, @StartIndex + 1, @ItemLen)))
    SELECT
      @StartIndex = @NextIndex
  END
  RETURN
END


Now, this is the example 1:

SELECT * FROM [SplitString]('Apple-Dell-HP-Lenovo-Sony','-')


Now, write the example 2:
SELECT * FROM [SplitString]('Apple,Dell,HP,Lenovo,Sony',',')
Here is the output from the code above:

Example code 3:
SELECT * FROM [SplitString]('1,2,3,4,5')

The output of the above code snippet is shown on the following picture:

HostForLIFE.eu SQL Server 2014 Hosting
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SQL Server 2014 Hosting Italy - HostForLIFE.eu :: How to Apply IDENTITY Column with SQL Server Memory Optimized Table?

clock February 3, 2015 06:33 by author Peter

In this article, I want to explain you about How to Apply IDENTITY Column with SQL Server Memory Optimized Table. Memory Optimized tables were introduced in SQL Server 2014. As we know, memory optimized tables don't support an IDENTITY column. thus however will we produce an INDENTITY (auto incremented) column with a memory optimized table?

And here is the example code:
CREATE TABLE IdentityTest
(
        ID INTEGER IDENTITY(1,1) NOT NULL PRIMARY KEY NONCLUSTERED HASH WITH (BUCKET_COUNT = 100000),
        Name VARCHAR(50) not null
)
WITH (MEMORY_OPTIMIZED = ON)


And this is the result:
Msg 10771, Level 16, State 7, Line 2
The feature ‘identity column’ is not yet implemented with memory optimized tables.

The workaround of an IDENTITY value is to use a SEQUENCE object. A SEQUENCE object (introduced with SQL Server 2012) works equally to an IDENTITY value with massive scope to the IDENTITY. The SEQUENCE object isn't restricted to a column or table however it's scoped to a whole information. one among the benefits of a SEQUENCE object is, it is controlled by application code additionally. This SEQUENCE is shared with multiple tables.

Apply IDENTITY Column with SQL Server Memory Optimized Table
To apply an IDENTITY column in a memory optimized table, you must use a SEQUENCE object. The following are the steps to use a SEQUENCE object as an IDENTITY column with a memory optimized table.

Step 1
Create a memory optimized table and a SEQUENCE object.
--Create memory optimized table
CREATE TABLE IdentityTest
(
        ID INTEGER NOT NULL PRIMARY KEY NONCLUSTERED HASH WITH (BUCKET_COUNT = 100000),
         Name VARCHAR(50) not null
)
WITH (MEMORY_OPTIMIZED = ON)
--Create SEQUENCE object
CREATE SEQUENCE [dbo].[TableNextId]
AS [int]
             START WITH 1000
              INCREMENT BY 1
              MINVALUE  1
              MAXVALUE 10000

Step 2
Use a SEQUENCE object to get following Id using the “NEXT value FOR” operate. SQL Server writes a replacement value within the value in the SEQUENCE to the system table whenever the next value FOR function is called. thus we will catch on filled like an IDENTITY column.
DECLARE @nextId INTEGER = NEXT VALUE FOR [dbo].[TableNextId]]
INSERT INTO IdentityTest VALUES (@nextId, 'my Test')

A memory optimized table doesn't support an IDENTITY (auto incremented) column. however using a SEQUENCE object, we will get an auto incremented value for a numeric data type column.

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About HostForLIFE.eu

HostForLIFE.eu is European Windows Hosting Provider which focuses on Windows Platform only. We deliver on-demand hosting solutions including Shared hosting, Reseller Hosting, Cloud Hosting, Dedicated Servers, and IT as a Service for companies of all sizes.

We have offered the latest Windows 2016 Hosting, ASP.NET Core 2.2.1 Hosting, ASP.NET MVC 6 Hosting and SQL 2017 Hosting.


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