A Fine Slice Of SQL Server
Andy Leonard diagnoses an error:
In case you’ve never encountered SSIS Catalog Error 27150, the error message reads:
The version of the project has changed since the instance of the execution has been created. Create a new execution instance and try again.
A customer recently encountered this error.
So… what happened?
Click through for the answer. I’ve had this happen as well for the same reason as Andy.
Comments closedThe SQL Server TDS protocol provides two main paths for query execution (Language and RPC events.) You can trace these events using the Batch::Starting/Completed (Language) and RPC:Starting/Completed (RPC) XEvents.
Language events are text streams requiring full parsing and may be susceptible to injection attacks. Language events also require educated guesses. For example, should select 1 return a smallint, bigint?
Bob goes on to show an example of a simple call being susceptible to SQL injection, explains why Remote Procedure Calls (RPCs) are superior, and what packing (or batching) RPCs does for you.
Comments closedAnirban Shaw ties functional programming to R:
Functional Programming‘s relevance in the R programming language, a language primarily known for its prowess in data analysis and statistical computing, is particularly noteworthy. By leveraging functional programming, organizations can improve operational efficiency and gain a competitive edge.
R’s ecosystem is enriched by functional programming paradigms, which enable developers and data scientists to write concise and expressive code for tasks such as data manipulation, transformation, and visualization.
In this article, we take a deep dive into the fundamental characteristics of R, the advantages of adopting functional programming within it and the essential concepts ingrained in the core of R.
Read on to see how the two fit together. H/T R-Bloggers.
Comments closedBrendan Tierney peruses an SDK:
Having set up your Oracle Cloud account and perhaps initiated some services, such as an Autonomous Database or an AI Service, you have some options with how you’ll interact with those services. The first is to use the online interfaces and tools for them. Another is to access these OCI services from your local PC or laptop. This latter method gives you greater flexibility for accessing these services, automating various tasks and building out some applications. This post will step through how to install the necessary Python library, how to configure for connecting to OCI and will demo some of the simpler APIs for accessing the OCI services. This will help you verify your connection is working correctly.
Click through for the details.
Comments closedMuhammad Ali explains explain plans:
In a previous post titled Exploring Postgres Performance: A Deep Dive into pg_stat_statements, we discussed the utility of pg_stat_statements as a tool for identifying resource-intensive queries in terms of memory, CPU, or I/O usage.
Now, let’s suppose you’ve pinpointed certain queries you’d like to investigate further. The EXPLAIN command is used to generate execution plans. It includes:
Read on to see what it includes, how you can generate an explain plan, and some of the optional settings.
Comments closedKevin Hill wants to know your thoughts:
What are you most concerned about in your database platforms?
Please pick from the list below, and expand on your choice in the comments if you like:
It’s an easy, one-question survey, so please do Kevin a favor and click some checkboxes and a single button after thinking about it for upwards of dozens of seconds.
1 CommentGilbert Quevauvilliers gets out the stopwatch:
I have seen some questions in the Power BI / Fabric Community forum asking why datasets with a scheduled refresh do not start based on the user’s selection.
In this blog post I am going to show you how you can schedule a Power BI dataset to start at the exact time you want it to be refreshed.
Read on to see how you can ensure refreshes run on time.
Comments closedSteven Sanderson builds a scree plot:
A scree plot is a line plot that shows the eigenvalues or variance explained by each principal component (PC) in a Principal Component Analysis (PCA). It is a useful tool for determining the number of PCs to retain in a PCA model.
In this blog post, we will show you how to create a scree plot in base R. We will use the
irisdataset as an example.
Read on to learn more about the plot, as well as examples of how to create scree plots.
Comments closedIn this video, we drill into the other most important normal form, learning what Fifth Normal Form (5NF) is, why Boyce-Codd Normal Form is not enough, and examples of why 5NF can be such a challenge to implement.
Until I read CJ Date’s Database Design and Relational Theory (2nd edition), my level of appreciation for 5th Normal Form was somewhat limited, but that’s mostly because I didn’t understand it well at all. I liked the connection trap example in this article, but Date’s book was the first really good explanation of 5NF and just how powerful it is. My hope is that I was successfully able to convey that power to audiences.
Comments closedRod Edwards looks at deadlocks:
I’ve also included a REALLY useful bit of functionality in a common free tool that you may not expect. Simply scroll to the to the end for it if you’re up to speed with Deadlocks already, or don’t want to read my inane rambles.
So we know what a deadlock is, multiple queries all contending for resources, one query holds some resources and is waiting on resources that another query has. That second query isn’t giving the resources up and is waiting for resources that the first query has. Both are stubborn, neither are releasing what they have until they completed…so we have a standoff.
Read on to learn a bit more about the mechanics behind deadlocks, as well as how Plan Explorer makes life easier.
Comments closed