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Blogs from Suhas
sql server 2005
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Internals of Database Snapshot – Part 3: Snapshot and Mirroring
In my earlier posts, we have seen how database snapshots work, and how the Buffer Pool is used when we query Snapshot Databases. In this post, we will see how Database Snapshots work, when they are created against Mirrored Databases. Let us assume we have a mirroring setup, as described in the below...
15 Aug 2011
Internals of Database Snapshot – Part 2: Snapshot and the Buffer Pool
In my earlier post, we have seen what Database Snapshots are, and how the Database Snapshots are maintained by the SQL Server Database Engine. In this post we will see how the data and index pages, belonging to the Snapshot, are managed in the Buffer Pool. Before we start drilling down further, let me...
2 Aug 2011
Internals of Database Snapshot
In this post, we will explore the internals of Database Snapshot. Most of this information is already available in the Internet, in the posts authored by the SQL Server Development Team and the CSS Escalation Team; however, through this post we will attempt to consolidate all of these information for...
31 Jul 2011
Advanced Performance Tuning – 4 :: Designing for better performance contd…
Few months back, I was working with one of my customers, who was engaged by his client to design a Survey Module. Nothing very fancy about the module, but the kind of reports that were to be delivered made it really tricky. Let me explain the requirements first: When customers click on a Survey Link...
15 Jul 2011
Advanced Performance Tuning – 3 :: Designing for better performance
If you have read my earlier post , you might be saying “Heck! This guy loves to post questions without providing proper answers!” Believe me, that is not my intention. My intention here is to help you understand common mistakes that people make, so that you can avoid them in your projects. The biggest...
14 Jul 2011
Advanced Performance Tuning – 2 :: Which side of the operator
If you have read my earlier blog post on the Importance of data-types , you might be wondering, “What the heck is going on here?” I had already written in that post the reason behind the slow performance – the EmpCountry column in the Employee table is CHAR(2) which cannot be directly compared with NCHAR...
13 Jul 2011
Transaction Log Backup Size in Bulk Logged Recovery Model
Assume that I have a database in Bulk Logged Recovery Model, and I perform a bulk operation that is minimally logged. Now, if I take a Log Backup, should not my Log Backup File Size be smaller than if I had performed the same operation in Full Recovery Model? I have seen many people confused by this...
29 Dec 2010
Advanced Performance Tuning – 1 :: Importance of data-types
Why did we develop DBMS systems? Not just for storing data – but also to be able to search for and retrieve stored data, and we define what our search criteria should be. This was probably true a couple of decades back, but we have come a long way now. With the huge advancement of technology...
12 Sep 2010
INF: How to re-setup Database Mirroring In SQL Server
One of my friends was asking this to me offline the other day: "I have Database in SQL Server, which is both Mirrored as well as Log Shipped. Log backups happen every 15 minutes; Mirroring happens in Synchronous mode and does not involve a witness. I want to break Mirroring (Remove Mirroring) and...
25 Aug 2010
INF: Automatic Identity Range Management with Merge Replication in Microsoft SQL Server 2005 / 2008
I have been working with SQL Server Replication for over 4 years now; and till now each case that I work on gives me something new to learn. At the same time, every case amazes me by the intricate design that has gone into implementation of SQL Server Replication. With the wonderful GUI design, replication...
21 Mar 2010
INF: A missing exception handler can cause blocking and eventual application hang.
Very recently, I had the opportunity to help troubleshoot a Blocking issue that one of our customer's was experiencing. In my experience, this is a very common scenario that I have seen. However, while troubleshooting this issue, and more so, while we wrote code to reproduce the issue at our end, we...
17 Mar 2010
Is NFR set?
Hi Friends, After a long break of about 8 months, I am back again!! Many things changed recently, and I was quite busy adopting to the changes – the most challenging was, of course, adopting myself to new parenthood. However, I am back again, with some new topics – topics that I have learnt or experienced...
12 Mar 2010
Revealing the secrets - Truncating a Transaction Log File
In my earlier blog post on Shrinking the Transaction Log files in SQL Server , I had mentioned that a VLF can be truncated only when all transactions, that have at least one command written into the specified VLF have either been committed or rolled back. While this is true, I understand that it might...
18 Jul 2009
Step-by-step guide to configure Database Mirroring between SQL Server Instances in a Workgroup
This post is again in response to requests from customers who want to know how to configure Database Mirroring between instances of SQL Server 2005 in a WORKGROUP. As you might have noticed, while configuring Database Mirroring using the GUI, it requires us to enter FQDNs of the servers; hence using...
13 Jul 2009
How to configure SQL Server Database Mail to send email using your Windows Live Mail Account or your GMail Account
Hi Friends, This post comes as a response to requests from many of our customers, who want to know the step by step process on how to configure SQL Server Database Mail to send emails using their Windows Live Mail Account or their Gmail Account. If you are using SQL Server 2005 or higher, you might have...
12 Jul 2009
Database Corruption Part 5 :: Dealing with Log File Corruption
Hi Friends, I am back again after a long time. Last month was the end of yet another financial year, and all of us were very busy with the processes involved with each year-end. Now that all those are completed, I could find some time for my next blog post on database corruption. Here, I will be targeting...
11 Jul 2009
Lock pages in memory now available for 64 bit Standard Edition of SQL Server
Great news!!! Due to over-whelming customer demand for the " Lock pages in memory " support for the Standard Edition of SQL Server 2005 and 2008 , Microsoft has released Cumulative Updates that will help SQL Server 64 bit Standard Edition to "lock pages" . This feature was already...
21 May 2009
Database Corruption Part 4 :: Recovering from a failed disk
It was a nice day a few days back - nice sunny day, with moderate temperatures. I got up early and after spending some time reading my favorite articles, made my way to office. In office, I realized I hadn't much work lying ahead; so sat down wondering how to account for my day. Suddenly the phone on...
18 May 2009
Database Corruption Part 3 :: Differences between CHECKTABLE and CHECKDB
In this post, we would have a look at the differences between DBCC CHECKTABLE and DBCC CHECKDB. We would not go deep into how each works – that has already been very beautifully documented by the SQL Server Storage Engine Team in their blog posts; we would rather have a quick look at the differences...
14 May 2009
Database Corruption Part 2 :: How to attach a database using the Create-Replace method
Ok, so, as promised, here’s my next post on Database Corruption. In this post, we will have a look at how to attach a database that you have detached and can now no longer attach back to SQL Server. This may happen if the database was already corrupt before it was detached; or if the database files have...
12 May 2009
Database Corruption Part 1 :: Introduction to Database Corruption in SQL Server
Hello Everybody, I think you will all agree with me that database corruption is one of the nightmares in the life of a DBA. We store precious data in databases and each day the dataset grows bigger and bigger. A database corruption issue not only puts the data at risk, it also threatens to take a toll...
8 Apr 2009
Invalid object name 'master.dbo.spt_values'. (Microsoft SQL Server, Error: 208)
Hi Friends, The last month has been a very busy month for all of us, and its not over yet. However, with the daily work, comes a few instances when we do encounter really interesting issues. End of the last month, I encountered an issue, that is really very interesting. The issue that I am talking...
5 Apr 2009
Shrinking the Transaction Log files in SQL Server
Hi Friends! This blog post is mainly to address concerns about increasing log file space, and how to go about to shrink the file. I am adding a priliminary content here as of now, but I will update this content as and when I get time and new content to add. Question: What is a log file, and why...
16 Mar 2009
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