Month: November 2020

Bloomfilters

From time to time I read something and the term “bloomfilter” comes up. This weekend I wanted to know what actually is a bloomfilter. For a more thorough explananation go to wiki. What follows is my “laymens” explanantion. If you have a set of values, and you want to check whether items in a second …

Index Fast Full Scan

Index index Today I want to query our table again. We alter the table so column N is not null. alter table index_demo modify n not null Table altered. desc index_demo Name Null? Type —————— ——– ————— N NOT NULL NUMBER D NUMBER M NUMBER S VARCHAR2(4000) What I would like to see is all …

GPG stuff

GPG (Gnu Privacy Guard) is the gnu implemantaion of PGP (Pretty Good Privacy). PGP was written decades ago by Phil Zimmermann, but it still does it job perfectly well. I will try to write down some notes about following subjects with respect to GPG Creating a public/private keypair Import and sign a public key Encrypt/Decrypt …