Is Event Sourcing Not Enough For You? Here's The Enormous Argument; Do It With A Database

Event sourcing is a model for handling software change. It allows the system to continuously create and complete events without going into chaos or inconsistency. Issues are typically resolved at their root cause instead of later, like an issue discovered but not fixed because the developer feared breaking their codebase (even though it was working fine).

Let’s consider an event sourcing architecture where the view layer consumes messages from multiple sources. Message inventory-bootstrapping logic must perform a database lookup for each message. Yet, each database lookup could be slow because it requires blocking for network access, disk writes, and locking to maintain consistency across clients.

Introduction

In his seminal paper, “On the Use of Event Sourcing for Managing Application States,” Jayfaced wrote that database state management is inherently more scalable and fault tolerant than event sourcing. His argument is that events are ephemeral and cannot be used to reconstruct the past. On the other hand, a database can reproduce a past snapshot of its state at any given time.

Since then, many developers have adopted event sourcing as their state management technique. But is it the best option? In this article, we’ll explore why Jayfaced’s modeling assumption – that events are always reliable – may not hold in practice. We’ll look at ways you can compensate for potential faults in your system’s data, and show how to build a robust database-based state manager using MongoDB Atlas and Long-Term Revision History (LTRH).

What is Event Sourcing?

Event sourcing is a pattern that describes how an application can capture changes to the data it manipulates, typically through transactions. This allows for consistent querying and data modification throughout a system’s history.

A key benefit of event sourcing is that it can enable your application to respond reliably and consistently to changes. For example, if someone updates a record in an application using event sourcing, ensure that the change is reflected in all caching mechanisms and the database itself – users will not be able to see or interact with stale data if events are not properly captured and processed.

Event sourcing should only be used when appropriate due to its complexity. While event sourcing offers advantages over traditional methods, such as improved reliability, these advantages come at a cost. Event sourcing requires more work from developers to set up and manage and more storage space for historical information. Therefore, event sourcing may not be right for every application. In certain cases, such as small or web applications built on lightweight frameworks, it may be sufficient to rely on traditional methods instead of event sourcing.

Why use a Database?

A database is a valuable asset for storing and retrieving large amounts of data. There are lots of advantages to using a database for your event sourcing project, including the following:

A database can scale to accommodate large amounts of data.
A database can organize and store data in a manner that is easy to use.
A database can help you create long-term storage solutions for your event-sourcing project.

Pros of an Event Sourcing architecture

Event sourcing is a great way to manage events, but it isn’t always the best option. A database can also be a good way to manage events. Here’s why: Event sourcing relies on a single source of truth. With a database, you have multiple sources of truth. If something goes wrong with the event store, you can still retrieve the events from the database and continue processing them as normal. Database-backed event sourcing also has other advantages:

You can scale your event store more easily than with a single event source.
You can use complex indexes and queries to find specific events.
You can back up your data and restore it even if the event store crashes.

An Alternative Example: Oracle Events

There are a few alternatives to event sourcing if you don’t want to use Oracle. One option is to use a database. Another is to use a combination of databases and event sourcing.

A database can be used as a storage layer for events. In this scenario, the events would be stored in the database and the application would use the database to manage and query the events.

A combination of databases and event sourcing can store and manage events using an application. The application would store the events in a single data store and use the event streaming capabilities of the two separate databases to provide real-time updates of changes to the event data.

Conclusion

A database might be the right solution for you if you’re looking for an even more detailed way to manage your events. A database will give you more control and alignment over all aspects of your event life cycle, from planning and organizing to data management. Plus, it can make it easier to share data with other teams in your organization and react quickly to changing needs. If you’re considering switching to a database-based event life cycle management system, now is the time to do so!

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A Tidy Solution for Bug Free Windows

by Dany Michael

A cluttered window is a small but genuinely persistent annoyance. Heavy frames, permanently fixed panels, and screens that never quite sit flush can all chip away at the light coming in and the view going out. When it comes to keeping insects at bay, a great many people quietly wish there were something a little neater available. The good news is that tidy, space conscious solutions have become far more common in recent years. A screen that fits snugly against the window and rolls away the moment it is not required keeps the insects out without cluttering the opening or spoiling the outlook that made the room appealing in the first place. Keeping the window clear For windows in particular, a compact design makes a substantial difference to how a room feels. Roller fly screens for windows tuck neatly into a slim cassette mounted on the frame, so whenever the mesh is not in use the glass is left completely clear. Light floods in exactly as it did before and the view stays entirely open. This is a welcome change from bulkier alternatives that sit permanently across the glass whether they are needed or not. The window carries on working precisely as it always did, with insect protection added only in the moments when the mesh is actually drawn across the opening. Small footprint, big difference Space is at a premium around any window, and a screen that minimises its own presence is worth a great deal more than it might first appear. A neat cassette and slim side guides take up very little room, fitting comfortably even on smaller or awkwardly positioned openings where a bulkier frame simply would not go. Because the mechanism itself is so compact, it rarely interferes with blinds, curtains, or window handles. The screen slots into the existing arrangement rather than forcing a complete rethink of how the window is dressed, which is often the difference between a straightforward installation and an expensive one. Suiting smaller rooms Compact screening genuinely comes into its own in rooms where space is already tight. Bathrooms, box rooms, and kitchens with worktops running right up to the window all benefit from a design that does not project into the room or obstruct the opening when it is in use. In these spaces every centimetre counts. A slim cassette sitting flush with the frame leaves blinds, tiles, and shelving completely undisturbed, which is frequently the difference between a screen that fits comfortably and one that simply cannot be used at all. The same logic applies to windows sitting behind furniture or appliances. Effortless everyday use A tidy screen is only genuinely worthwhile if it is also easy to operate, and these designs are made with that firmly in mind. The mesh pulls across smoothly and retracts at a touch, so using it becomes second nature within a matter of days rather than something anyone has to think about. There is no wrestling with rigid panels, no hunting through a cupboard for the right fitting, and no need to enlist a second pair of hands. The screen is simply ready whenever the window opens and gone again the moment it closes, which is exactly what most people want from something they use daily. Working alongside blinds and curtains One question that comes up regularly is how screening sits alongside existing window dressings, and it is a fair thing to ask. A slim cassette mounted to the outer frame generally leaves plenty of clearance for blinds to raise and lower or for curtains to draw across without catching. It is worth checking the projection of any blind before choosing, particularly with deeper roman or roller blinds that sit further into the room. Where clearance is tight, a screen mounted externally or a slimmer cassette profile usually resolves matters. A quick measurement beforehand avoids an awkward discovery on the day of fitting. A neat finish that lasts Because the cassette becomes a permanent part of the window, the quality of its finish matters more than it would on something removable. Powder coated aluminium in a colour matched to the frame holds its appearance well through years of sun and rain without fading or chalking. The mesh itself benefits from spending most of the year rolled safely away inside that housing. Protected from ultraviolet light and from the worst of the weather, it stays taut and clear for far longer than mesh left permanently stretched across an opening, which is a quiet advantage of the whole design....

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