A Journey of a Thousand Miles Begins with a Single Step

Redundant conditional expression with the ternary operator

This operator (?) is also known as the ternary operator because it uses three operands. Instead of an if-then-else statement this operator can make your code more readable, when something is so simple you don’t want to waste many lines for.

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Oracle DB Datatype for boolean - which to choose for Java Persistence?

If you have to deal with the Oracle DB (11g), Boolean values have no specific datatype yet. Some uses number - a SMALLINT, some uses a character - VARCHAR(1). Number or Character - which to choose? This post illustrates both approaches for the Oracle DB for Java with the major Persistence APIs JDBC and JPA.

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Processes within HP NonStop

This post explains the basic concept about a process on the Tandem. It also contains a (told) custom process presentation (Aiellogram) by Dennis Aiello, a tech trainer for Tandem computers from my training on the HP premises. The main conceptional focus is how to keep a process fault tolerant.

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Multiple configuration files for logstash

Structure of a config file: A Logstash config file has a separate section for each type of plugin you want to add to the event processing pipeline.

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List and check alias in elasticsearch

This post gives an example how to check an alias or aliases in elasticsearch with the REST-API.

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List all used IP addresses in a network

nmap - Network exploration tool and security / port scanner - allows to scan an entire network and list all used or assigned IP addresses in a private network. This post shows a little example.

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Convert from CSV to JSON with logstash

logstash allows with various plugins a quick solution, to convert CSV input to JSON output.

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Check optional scripts in rpm file

RPM allows optional scripts to be executed within the install and remove operation.

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Correct Rpmdb

Seeing this Rpmdb checksum is invalid: dCDPT(pkg checksums) in RedHat or CentOS?

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