Finite-state machine (FSM) is a wonderful model of computation that has many practical applications. One of my favorites is turning business logic into simple FSMs. For example consider the following requirements for an order management system:
Over the last couple of years I've been doing talks about running Oracle databases in the cloud. In both my talks and articles I refer to the Licensing Oracle Software in the Cloud Computing Environment document. This morning I was reading a post on a mailing list and someone mentioned the document had been updated on…
Simplex Sigillum Veri
Manipulating actually-big-data is just as easy as performing an analysis on a dataset with only a few records.
Building resilient services by identifying foreign state mutations and grouping local changes into restartable atomic phases so that every request can be driven to completion.
Recently, I migrated my Clojure-driven pet project from PostgreSQL to Datomic. This is Queryfeed , a web application to fetch data from social networks. I’ve been running it for several years considering it as a playground for some experiments. Long ago, it was written in Python, then I ported it to Clojure.
When people move to different jobs, here’s where they go.
Apache Parquet and Apache ORC have become a popular file formats for storing data in the Hadoop ecosystem. Their primary value proposition ...
A backup-software developer's deep dive into Apple's APFS file system — snapshots, cloning, space sharing, and what it all means for reliable Mac backups.
The relatively new R Notebooks improve the workflows of common data analysis in ways Jupyter Notebooks can’t.
Though most relational databases (like MySQL) are "row oriented", in that they keep rows stored together... experience has taught us that pivoting the data arrow so that columns, and not rows, are stored together can be beneficial. This is an old observation that most experienced programmers know about as the…
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I wrote up my experience using Python to process data from a shared Google Sheets spreadsheet
Previously in this series
Many years ago I worked on IBM DB2 and so I occasionally get the question, “how the heck could you folks possibly have four relational database management system code bases?” Some go on to argue that a single code base would have been much more efficient. That’s certainly true. And, had we moved to a single code base…
If you like the series, check out my book on Database Internals!
U.S. equity index funds have grown dramatically in recent decades, from a negligible $500MM in assets in the early 1980s to a staggering $4T today. The consensus view in the investment community is that this growth is unsustainable. Indexing, after all, is a form of free-riding, and a market can only support so many…
Mosaic: Processing a trillion-edge graph on a single machine Maass et al., EuroSys’17 Unless your graph is bigger than Facebook’s, you can process it on a single machine. With the incep…
A journey into making Stack Overflow job search results relevant to you
Implementing Principal Component Analysis from scratch in Python: scatter matrices, eigenvectors, variance explained, and comparison with scikit-learn PCA.
