web technology

Articles about web technologies how stuff work on web application, tutorials, website performance and technical seo tips

Elastic Search and Lucene

Elasticsearch is search engine server where you can index your records and make a very effect search and ranking, when use millions of records. Elastic search use as base, a java project called Apache Lucene, elastic team build a REST api where you can use all the features of Lucene by making ...

22nd February 2016
by Vasilis Vontikakis

PHP Database Migrations

When we development a web application usually there is the need for a database for storing the data, one of the firsts steps is create a schema and in some later time point, maybe we need to make changes. Changes could include adding a new table, or column, a foreign key etc. So not only we need ...

22nd June 2019
by Vasilis Vontikakis

Mysql Upgrading from 5.5 to 5.6

If you have a VPS, at some point you will have to make the upgrade from mysql 5.5 to 5.6. However the upgrade may fail if your VPS doesn't have more than 500MB of RAM or your all your free RAM resources are less than 400MB.

The reason is that mysql 5.6 needs to allocate 400MB additional ...

9th May 2019
by Vasilis Vontikakis

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