Building a BFT JSON CRDT

Oracle optimizer Or Expansion Transformations

linux-insides

Issue #296

11/22/2022

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Hey-yo
Maybe you saw it, maybe you didn't, but there's a pretty cool cheat sheet for programming you can use from your command line or integrate into your editors here. I'm going to add it to my editor after I send out this issue (nvim) because I'm tired of ALT+TABing to the browser to search trivial things I don't memorize.

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Building a BFT JSON CRDT

Published: 16 November 2022
Tags: data structures, database, distributed systems, rust


CRDTs are a family of data structures that are used to replicate data across multiple computers. They are designed to avoid conflicts when people write data to the same place.
Some highlights:

  • CRDTs mathematically guarantee that an application can safely update their local state without needing to coordinate with all of its peers
  • Traditional databases focus on a property called linearizability, which guarantees that all operations behave as if executed on a single copy of the data
  • CRDTs can be made fault tolerant by solving a problem called the Byzantine Broadcast


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Oracle optimizer Or Expansion Transformations

Published: 26 October 2022
Tags: database, optimization, sql


Jonathan Lewis discusses the Or Expansion Transformation, a feature of the Oracle Optimizer, and how it can be used to improve query performance.
Some highlights:

  • The optimizer is able to take a single query block and transform it into a UNION ALL of 2 or more query blocks which can then be optimized and run separately
  • "A critical difference between Concatenation and Or-Expansion is that the OR’ed access predicates for the driving table must all be indexed before Concatenation can be used"
  • The or expansion allows queries to be optimized a lot more, but requires a lot more time for actual optimization to take place


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linux-insides

Published: 31 July 2022
Tags: c, linux, os


0xAX and some other contributors have made an online book on the Linux kernel and its inner workings. It's too long for me to add any highlights of use.


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Link Clicks Clicks % Unique Clicks Unique Clicks %
Building a BFT JSON CRDT 94 33.69% 101 34.71
Oracle optimizer Or Expansion Transformations 24 8.60% 24 8.25
linux-insides 161 57.71% 166 57.04

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