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Day: August 25, 2021

Full Query Logging in Cassandra 4.0

Shelby Carpenter explains a new feature in Apache Cassandra 4.0:

First off, we need to understand what counts as a full query log (FQL) in Cassandra. Full query logs record all successful Cassandra Query Language (CQL) requests. Audit logs (also a new feature of Cassandra 4.0), on the other hand, contain both successful and unsuccessful CQL requests. (To learn about the different forms of logging and diagnostic events in Cassandra 4.0, check out this blog by Instaclustr Co-Founder and CTO Ben Bromhead.)

The FQL framework was implemented to be lightweight from the very beginning so there is no need to worry about the performance. This is achieved by a library called Chronicle Queues, which is designed for low latency and high-performance messaging for critical applications.

Read on for information on use cases as well as how you can configure and access full query log information.

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Loops in Powershell

Robert Cain takes us through different structured programming constructs in Powershell:

Continuing my series on PowerShell basics, in this installment we’ll talk bout looping in PowerShell. Looping is a mechanism for repeating a set of instructions multiple times, ending once a condition is met. Looping is also known as iterating, as in “iterating over an array”.

Loops continue until one of two things happen. In one type of loop, the loop continues until a certain condition is true. In the second type, the loop will iterate over a collection (also called an array) of objects until the entire collection has been gone through.

Read on for an enumeration of the different types of loops you can create with this language.

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Dealing with Corruption around In-Memory OLTP

Chris Taylor has a tale of woe:

Late last week (20th) we had an emergency call from a company that had a production database go into Suspect mode and needed help. Now this isn’t a great situation to be in so when they then go on to tell us that the last valid backup they had was from the 12th and the backup job had been failing since then – even less of a great situation to be in

Read the whole thing.

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Scanning and Classification with Azure Purview

Angela Henry continues a series on Azure Purview:

In our previous article for this series, Purview Part 2: Data Catalog, we examined the portion of the end user experience where people will spend the majority of their time. But the question is, how does that Data Catalog get populated? The Data Catalog is populated by the Scanning and Classification features of Purview, which is the focus of this article.

Click through to see what you need to set up and how the process works.

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