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Josep

Learning in Internet’s era

In the last post of the year I’ll talk about knowledge and how we are continuously learning. The idea of the topic comes from a Packt Publishing offer: selling books for Xmas for $5.

It doesn’t matter our job, it’s changing, so we’ve to evolve too. In fact, I don’t know any job that you don’t have to improve your skills continuously usually . . .

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April 20, 2016

SETVAL for all sequences in a schema

In PostgreSQL, when you’re working with sequences, if you insert a future value due to the incrementing values, you will get an error when that value is going to be inserted. I like much more how SQL Server handles autoincrement columns with its IDENTITY property, that would be like the sequences linked to a table like SERIAL, but it’s much . . .

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April 20, 2016

Review of Getting Started with OrientDB book

Disclaimer: I was asked to review the Getting Started with OrientDB book and I received a free ebook copy of it.

OrientDB is defined in its website as: an Open Source GraphDB with a mix of features taken from Document Databases and Object Orientation. It’s a new and promising database. But it’s has little documentation and it’s quite . . .

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April 20, 2016

Hidden cartesian product

Introduction

There’s a project in my company that has a dedicated PostgreSQL virtual server with 12 cores and 32 GB RAM and it’s exclusively being used by one developer. He told me that he had an error with a query and checking the log file I could find: “ERROR: could not write block XXXX of temporary file: No space left”. But there were 27 . . .

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April 20, 2016

Get-Hash, a powershell hash function

I needed a hash function that I could pass a text string or a file to compute its hash (MD5, SHA1, etc…). But unfortunately Powershell hasn’t got one, so I started to look for alternatives:

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April 20, 2016

Remove IDENTITY property from a primary key column in SQL Server

When there’s a table with a primary key that is an IDENTITY and you want to remove the IDENTITY property, there’s no simple SQL code to do it. It is not a trivial task. In fact, there’re many steps to be done and it’s better to do all of them inside a single transaction, to avoid to leave the database in a inconsistent way (without FK, or . . .

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April 20, 2016

Get SQL Server user permissions

I’ve found three ways of getting user permissions (grants and denies) in SQL Server:

  • SQL Server Management Studio: It’s OK and user-friendly. But it’s not an option if you’ve a large farm of servers or you want to script it and create task to run the checks.
  • Impersonate as the user and check its permissions.
  • SELECT on system tables to see . . .

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April 19, 2016

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