Umachandar Jayachandran

Umachandar
Jayachandran

Umachandar Jayachandran works on the SQL Performance Engineering Team at Microsoft. He specializes in online transaction processing and data warehousing, and he is a contributing author of SQL Unleashed, 2nd Edition (SAMS). You can find his contributions at http://blogs.msdn.com/sqltips and http://blogs.msdn.com/sqlperf.

Articles
July Challenge Solution: Localizing Language/Region-Based Customer Settings
Localizing Language/Region-Based Customer Settings
A DBA is designing the product catalog functionality of a Web-based order placement application. Your task is to create an appropriate database object that he can use on the client or server and that
Optimizing Queries for Fact Tables
Help a DBA devise a scheme that lets him easily optimize two queries. The indexing scheme or optimization technique that you come up with should be flexible enough to help with the queries use a table.
Check for Objects Created Without SET Options Enabled
Test your SQL Server savvy in this month's Reader Challenge. Submit your solution in an email message to challenge@sqlmag.com by May 10.
Change the Status of Table Items
Solution to February Reader Challenge: Check for an Empty Table 2

There were no winners for the February Reader Challenge, "Check for an Empty Table." Here's a recap of the problem and the solution to the February Reader Challenge.

Check for an Empty Table

The winners for the January Reader Challenge, "Converting a Hexadecimal String to a Varbinary Value" will be announced at a later date. Please watch this article page for updates. Here's a recap of the problem and the solution to the January Reader Challenge.

Converting a Hexadecimal String to a Varbinary Value

Congratulations to John T. Keller, who won first prize of $100 for the best solution to the December Reader Challenge, "Improve T-SQL to Prevent Deadlocks" and to Bill Twomey who won second prize of $50. John is a database developer for Softek Solutions, and Bill is a Microsoft SQL Server DBA for Database Solutions. Here's a recap of the problem and the solution to the December Reader Challenge.

Improve T-SQL to Prevent Deadlocks

There were no winners for the November Reader Challenge, "Parse and Insert Data from Uploaded Image Files." Here’s a recap of the problem and the solution to the November Reader Challenge.

November Reader Challenge: Parse and Insert Data from Uploaded Image Files

Congratulations to Chad Boyd, who won first prize of $100 for the best solution to the October Reader Challenge, "Enforcing Uniqueness Without the Unique Constraint." Chad graciously donated his prize to the Make-a-Wish Foundation (http://www.wish.org). Here’s a recap of the problem and the solution to the October Reader Challenge.

Enforcing Uniqueness Without the Unique Constraint 2

Congratulations to Steve Kass and Lay Chew. Steve won first prize of $100 for the best solution to the September Reader Challenge, "Fixing a Faulty Lookup Query." Lay won second prize of $50. Here’s a recap of the problem and the solution to the September Reader Challenge.

Generating 6-Digit All-Numeric File Numbers for Search - 13 Jul 2006
The July Reader Challenge, "Creating an Easy Query Mechanism for Gathering Customer Data," had no winners. Here’s a recap of the problem and the solution to the July Reader Challenge.
Creating an Easy Query Mechanism for Gathering Customer Data

Congratulations to Ahmad Bahr Mohamed, who recently won the May Reader Challenge. Ahmad Bahr Mohamed, a DBA/Database developer at Applied Industrial Technology (AIT) in Cleveland, Ohio, won an honorable mention for the best solution to the June Reader Challenge, "Writing Efficient Queries to Return Inventory Items." Here’s a recap of the problem and the solution to the June Reader Challenge.

Writing Efficient Queries to Return Inventory Items

Congratulations to Ahmad Bahr Mohamed and Len Binns. Ahmad Bahr Mohamed, a DBA/Database developer at Applied Industrial Technology (AIT) in Cleveland, Ohio, won first prize of $100 for the best solution to the May Reader Challenge, "Running SQL Server 2000 Queries in SQL Server 2005." Len Binns, a Senior Programmer/Analyst at the University at Buffalo's School of Dental Medicine, won second prize of $50. Here’s a recap of the problem and the solution to the May Reader Challenge.

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From the Blogs
Aug 27, 2015
blog

A Replacement for Maintenance Plan Backups

This blog post is a bit of a ‘repeat’ – since I already covered much of the rationale behind this post in Part 23 of my multi-part series on AlwaysOn Availability Groups and SQL Server Agent Jobs. But, I also figured that this is enough of an important topic to merit its own blog post....More
Aug 19, 2015
blog

Looking forward to Containers

Virtualization has long been a staple when it comes to computing. In essence, virtualization is really just the use of abstraction to make things either easier to manage or more fault-tolerant. Disks, for example, have long been virtualized in the sense that a single, physical, can easily be divided up into multiple logical (or virtual) volumes (or drives) just as easily as a number of discreet physical disks can also be virtualized into a single drive (via RAID) – which can further be partitioned into volumes, LUNs, and so....More
Jul 28, 2015
blog

AlwaysOn Availability Groups and SQL Server Jobs, Part 29: Practical Implementation Tips

My initial goal in writing this series of posts was to outline some of the concerns surrounding Availability Groups (AGs) and SQL Server Agent Jobs – and call out how there is virtually no guidance from Microsoft on this front and then detail some of the pitfalls and options available for tackling this problem domain. I initially expected this series of posts to have between 25 and 30 posts – according to some of the early outlines I created ‘way back when’....More
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