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Tales of the DevOps | HowTos & Experiments

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Tales of the DevOps | HowTos & Experiments | devopslog.wordpress.com Reviews

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MergeSort Example using Python Multiprocessing | Tales of the DevOps

https://devopslog.wordpress.com/2012/04/15/mergesort-example-using-python-multiprocessing

Tales of the DevOps. MergeSort Example using Python Multiprocessing. Sorting algorithms are everywhere. In filesystems, databases, in the sort methods of the Javascript and Ruby Array object or the Python list object. There are many algoriths but I believe some of the most known methods of sorting are:. Bubble sort ( O(n. Selection sort ( O(n. Merge sort ( O(nlogn). We start by writing the divider function:. Let us take it a little step-by-step:. If length a = 1: return a. Find the middle of the list ( m.

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Exporting MySQL query results using the CSV engine | Tales of the DevOps

https://devopslog.wordpress.com/2012/11/05/exporting-mysql-query-results-using-the-csv-engine

Tales of the DevOps. Exporting MySQL query results using the CSV engine. MySQL supports a quite large number of different storage engines. Each has different characteristics (transactional or non-transactional, foreign key support etc) and table file format. Some of them show very special behaviour and I believe that are worth noting because they can enable a DBA to easily perform various tasks:. Mysql:/ user name[:password]@host name[:port num]/db name/tbl name. Let’s say because we are implementi...

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Tales of the DevOps | HowTos & Experiments | Page 2

https://devopslog.wordpress.com/page/2

Tales of the DevOps. Newton-Raphson method using Python SymPy. Newton-Raphson is a very popular method for the numerical calculation of an equation’s root. Its’ basic concepts for formulation originate from the Taylor theorem. And of course the fact that function value becomes zero at the root point. You can read more about the method in the Wikipedia entry. In various distributions you can install the package directly with the help of the corresponding package manager. For example in Ubuntu:. Enter your...

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Newton-Raphson method using Python SymPy | Tales of the DevOps

https://devopslog.wordpress.com/2012/12/23/newton-raphson-method-using-python-sympy

Tales of the DevOps. Newton-Raphson method using Python SymPy. Newton-Raphson is a very popular method for the numerical calculation of an equation’s root. Its’ basic concepts for formulation originate from the Taylor theorem. And of course the fact that function value becomes zero at the root point. You can read more about the method in the Wikipedia entry. In various distributions you can install the package directly with the help of the corresponding package manager. For example in Ubuntu:. You are co...

5

Disassembling/Reassembling the MongoDB ObjectId | Tales of the DevOps

https://devopslog.wordpress.com/2012/04/22/disassemblingreassembling-mongodb-objectids

Tales of the DevOps. Disassembling/Reassembling the MongoDB ObjectId. Automatically adds an id. Field for every inserted document (if one is not provided by the user), the value of which must be unique and can be of any type, but most commonly is of ObjectId. MongoDB docs are very detailed and the ObjectId specification. Helps us break down the ObjectId automatically generated value into distinctive parts. These parts are (consecutively):. 8594; Generation timestamp (4 bytes). We start by importing the o...

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Tales of the DevOps. Using GROUP CONCAT Lists Directly In SQL. What is the GROUP CONCAT function? Ever wondered how to retrieve the values within a group when you perform a GROUP BY operation on your data? GROUP CONCAT([DISTINCT] expr [,expr .] [ORDER BY {unsigned integer col name expr} [ASC DESC] [,col name .] [SEPARATOR str val]). The length of the generated list length is controlled by a variable group concat max len. The good news are that it can also be defined as a SESSION variable dynamically.

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