CHunky Universe of Vigourous Astonishing SHarepoint :)

Tag Archives: SQL Server

Announcing web based SQL Max Memory calculator


Today I want to announce a tiny web application for calculating max memory in the SQL Server to improve the overall performance in you SharePoint environment:

SQL Max Memory Calculator.

One of the important actions to improve the performance in SharePoint is fine tuning of the SQL Databases. Regarding the databases one of the crucial settings is the Max Memory Setting. You can read more about database optimizations for SharePoint in a whitepaper written by SharePoint MVP Vlad Catrinescu. The document is available on the SharePoint Community Web Site:

Vlad Catrinescu also created a windows application for calculating the max memory for SQL which can be downloaded from codeplex (GPL v2):

This windows application has inspired me and my colleagues to create the web based application SQL Max. The goal of the SQL Max web app is to take Vlad’s idea a step further and make it available directly in your browser, on desktop at work, or on the go in your mobile. This mobile web app will also be available for offline access. Simply put, why should you dowload a zip file, extract and run the .exe file? Perhaps you cannot run executable files due restrictions, or perhaps you are not running Windows at all.

How it works

The web application is completely javascript-based. It is open source (MIT license) and the code is freely available at github:

The most important part of the solution is the formula. The original formula (C#) is provided by Vlad Catrinescu is as follows:

SQL Max Memory = TotalPhyMem – (NumOfSQLThreads * ThreadStackSize) – (1GB * CEILING(NumOfCores/4)) – OS Reserved
NumOfSQLThreads = 256 + (NumOfProcessors*- 4) * 8 (* If NumOfProcessors > 4, else 0)
ThreadStackSize = 2MB on x64 or 4 MB on 64-bit (IA64)
OS Reserved = 20% of total ram for under if system has 15GB. 12.5% for over 20GB

When you’ve filled in the values in the form, you’ll see the max memory in the blue box above:


How to apply this setting in the SQL Server

To apply the max memory follow these steps, the instructions come originally from technet:

  1. In Object Explorer, right-click a server and selectProperties.
  2. Click the Memory node.
  3. Under Server Memory Options, enter the amount that you want for Minimum server memory and Maximum server memory.Use the default settings to allow SQL Server to change its memory requirements dynamically based on available system resources. The default setting for min server memory is 0, and the default setting for max server memory is 2147483647 megabytes (MB). The minimum amount of memory you can specify for max server memory is 16 MB.


SQL Server delete backup history

Exactly what I needed today.

use msdb
sp_delete_backuphistory '2013-01-30'

See more details on sp_delete_backuphistory stored procedure on msdn

Problem med Sharepoint efter installation av SQL Server

Jag installerade Sharepoint först vilket skapade nödvändiga databaser. Sedan installerade jag SQL Server och angav det som default instance.

Efter det gick det inte att använda Sharepoint. Felmeddelandet som spottades ut var “Cannot connect to the configuration database”.

Alla försök att starta SQL Server med instansen “Sharepoint” var verkningslösa.

Den enda lösningen var att avinstallera Sharepoint, alla Web Sites (i IIS administration) och installera Sharepoint på nytt, ange den nya SQL Server som standard för denna Sharepoint-installation.

Återskapa koppling till login i DB efter restore

Om du har kört restore på en databas, så kan det hända att det inte går att ändra rättigheter, och den login du använt inte kan se databasen. SQL Server spottar ut felmeddelandet med kod 15023:

The database is not accessible. (Object Explorer)

Om det är WebService som i sin tur anropar databasen, kan det komma ett sådant felmeddelande:

The underlying provider failed on Open.

Lösningen är att uppdatera kopplingen. Hämtat från denna blog.

EXEC sp_change_users_login 'Auto_Fix', 'your_login', NULL, 'YoUrPaSsWoRd'

Eller bara:

sp_change_users_login 'auto_fix', 'your_login'

Det här är hämtat från forumet:

När du har kört det kommer det stå i Messages:

The row for user 'your_login' will be fixed by updating its login link to a login already in existence.
The number of orphaned users fixed by updating users was 1.
The number of orphaned users fixed by adding new logins and then updating users was 0.
Daniel Chronlund Cloud Tech Blog

News, tips and thoughts for Microsoft cloud fans

Вула Чăвашла

VulaCV - Чăвашла вулаттаракан сайт

Discovering SharePoint

And going crazy doing it

Bram de Jager - Architect, Speaker, Author

Microsoft 365, SharePoint and Azure

SharePoint Dragons

Nikander & Margriet on SharePoint

Mai Omar Desouki

PFE @ Microsoft

Cameron Dwyer

Office 365, SharePoint, Azure, OnePlace Solutions & Life's Other Little Wonders


Me and My doings!

Share SharePoint Points !

By Mohit Vashishtha

Jimmy Janlén "Den Scrummande Konsulten"

Erfarenheter, synpunkter och raljerande om Scrum från Jimmy Janlén

Aryan Nava

DevOps, Cloud and Blockchain Consultant


SharePoint for everyone


Ryan Dennis is a SharePoint Solution Architect with a passion for SharePoint and PowerShell

SharePoint 2020

The Vision for a Future of Clarity

Aharoni in Unicode

Treacle tarts for great justice

... And All That JS

JavaScript, Web Apps and SharePoint


Mostly what I know and share about...