The Bit Bucket

The on-premises versions of SQL Server have the ability to connect one server to another via a mechanism called Linked Servers.

Azure-based SQL Server databases can communicate with each other by a mechanism called External Tables. I’ll write more about External Tables again soon.

Common performance issue with linked servers

With Linked Servers, I often hear people describing performance problems. There’s a configuration setting that commonly causes this, yet it seems to be almost unknown.

2026-03-11

I mentioned in a previous post that the standard storage format for Microsoft Fabric is in OneLake. In fact, you’ll find that pretty much everything that you use in Fabric ends up being stored in OneLake.

The thinking is that you’d be able to look at the data that was captured and being used by one tool then by using a different tool and so on. Now that that all makes sense, it’s not 100% true yet, but the story is getting better.

2026-03-10

I’m not a great fan of linked servers in SQL Server but they are often necessary. If I’m working with the latest version of SQL Server, I really prefer to use External Data Sources and External Tables. But not everyone is on the latest version. In the meantime, what I see all the time, is people hardcoding server names like this:

SDUPROD2022.WWIDB.Payroll.Employees

That makes your code really hard to manage. One option to get around that is to use synonyms.

2026-03-09

An Eventhouse in Microsoft Fabric is a container for specialized databases designed specifically for real-time event analytics (i.e., KQL Databases).

They aren’t just general-purpose stores. They are optimized for very specific scenarios where you’re dealing with high-velocity event data and you need insights almost instantly.

Even though most eventhouses have only a single database, they can have more than one. At their core, the databases are built on the Kusto engine, which is the same technology behind Azure Data Explorer. That means they are extremely good at handling time-series and log-style workloads. If you’ve ever worked with telemetry, application logs, or security data, you’ll know how important it is to query billions of small, timestamped records quickly. That’s exactly what Eventhouse databases are tuned for.

2026-03-08

Most SQL Server developers are aware that they can create computed columns. We do that by defining a column AS some expression like this:

CREATE TABLE Sales.OrderLines
(
    ...
    UnitPrice decimal(18, 2) NOT NULL,
    PickedQuantity decimal(18, 3) NOT NULL,
    LineTotal AS ROUND(UnitPrice * PickedQuantity, 2)
    ...
)

Each time the value from that LineTotal column is queried, the calculation is performed so the result can be returned. This makes sense when the value is changing regularly and the value is queried infrequently.

2026-03-07

I’ve been planning a new podcast for quite a while. I’ve been fascinated by what makes a successful technical career that lasts a long time.

Over the years, I’ve seen far too many promising people either just stop advancing, or sometimes, completely burn out. As an example, I remember a very technical friend saying he’d had enough, and he bought a small farm in Tasmania.

The first of these shows is now recorded and published. And this time, they’re video podcasts, not just audio. I hope you enjoy it.

2026-03-06

While SQL Server’s plan cache generally is self-maintaining, poor application coding practices can cause the plan cache to become full of query plans that have only ever been used a single time and that are unlikely to ever be reused. We call this plan cache pollution.

Causes

The most common cause of these issues are programming libraries that send multiple variations of a single query. For example, imagine I have a query like:

2026-03-05

Alongside lakehouses, Fabric also provides warehouses, and these are designed to feel very familiar if you’ve ever worked with a traditional relational database or data warehouse. The warehouse in Fabric is a fully managed, SQL-based analytics store, which means you don’t need to worry about provisioning servers, managing indexes, or tuning storage. It’s optimized under the hood to give you fast, consistent performance for structured data queries.

This is really valuable if your team is already comfortable with SQL. Business analysts, data professionals, and report builders can continue to use the language and tools they already know, without having to learn a whole new paradigm. Warehouses enforce relational schemas — tables with defined columns, keys, and constraints — so you get consistency and predictability in how your data is structured.

2026-03-04

I’ve had a number of clients over the years who were wondering how the SQL dependencies in ASP.NET evolved, and what they were used for. I’ve updated a previous blog post about this below.

Traditional ASP Applications

In traditional ASP applications, every time the user would request a page, the application would retrieve the data from the database to render the page. Clearly this doesn’t scale very well. It works for a small number of users but not a large number. Often though, this data access can be completely avoided for certain types of data.

2026-03-03

A lakehouse is a relatively new storage concept, and it’s designed to give you the best of both worlds. On one side, you have a traditional data lake, which is extremely flexible — you can throw files of any shape or size into it, including structured, semi-structured, and unstructured data. On the other side, you have a data warehouse, which adds the structure, schema enforcement, and query performance that analysts are used to.

2026-03-02