Donderdag 16 maart
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Op donderdag 16 maart vindt de tweede AMIS Tools Showroom Sessie plaats. De eerste sessie was op 13 december: hierin hebben 16 AMIS-ers in korte en hele korte presentaties en demonstraties allerlei handige tools en hulpmiddelen laten zien. De nadruk in deze sessie lag op tools voor monitoring, communicatie en collaboration.
In deze tweede sessie gaan we op zoek naar nog (more...)
web scale patterns in the bol.com back office – Mixed SQL – NoSQL
In the previous weeks, we started a series of blog posts that show you how we use “web scale” patterns to achieve scalability and flexibility in our back office software. The previous patterns discussed were Event Sourcing and CQRS. This week we will dive into mixed SQL – NoSQL. Showing you how this doesn’t just solve a technical problem, they help (more...)
web scale patterns in the bol.com back office – Event Sourcing
Last week we started a series of blog posts we show you how we use “web scale” patterns to achieve scaleability and flexibility in our back office software. Last weeks pattern we discussed was CQRS. This week we will dive in to Event Sourcing. Showing you how this doesn’t just solve a technical problem, they helps us solve our business problems!
web scale patterns in the bol.com back office – CQRS
In this series of blog posts we show you how we use “web scale” patterns to achieve scaleability and flexibility in our back office software. We will guide you through how we apply patterns like CQRS, event sourcing and micro services to solve puzzles in our back office services. These patterns don’t just solve a technical problem, they helps us solve our business (more...)
Presentatie Agile schalen op basis van best practices
Net als de afgelopen jaren heb ik afgelopen vrijdag een presentatie over Agile Architectuur gegeven. Kern van de presentatie dit jaar is dat bij het schalen van Agile vooral de problemen/uitdagingen die je onderweg tegenkomt aangepakt moeten worden en niet klakkeloos een framework gaat implementeren. Aan de hand van voorbeelden leg ik uit hoe we dit binnen bol.com aanpakken.
This blogpost is an introduction to Intel’s Pin dynamic instrumentation framework. Pin and the pintools were brought to my attention by Mahmoud Hatem in his blogpost Tracing Memory access of an oracle process: Intel PinTools. The Pin framework provides an API that abstracts instruction-set specifics (on the CPU layer). Because this is a dynamic binary instrumentation tool, it requires no recompiling of source code. This means we can use it with programs like the Oracle (more...)
Book – Holacracy
Ik kwam een mooie samenvatting van het boek Holacracy van Brian J. Robertson tegen. Eerder schreef ik een review over Getting Teams Done. Waarin holacracy (en de variant Spark) beschreven wordt als een methode voor teamproductiviteit, net als GTD dat is voor individuele productiviteit. Mijn ervaringen met de holacracy variant Spark beschreef ik in deze post.
De case die vaak gegeven wordt als holacracy adoptie beschreven wordt is Zappos, maar er zijn (more...)
If you manage an Oracle Engineered System you may wonder how well your Smart Scans are performing. Are you taking full advantage of Exadata Optimizations? If so, how do you measure them?
Uwe Hesse explains well some important statistics on Exadata. For some time now, eDB360 includes a report on Smart Scan efficiency, which is nothing but a Google Chart on top of relevant statistics.
Sample chart below is from a data warehouse DW application. It (more...)
In SQL Developer you have a lot of options when connecting to the database. You can use the TNS entries defined but you can also give the hostname, port and SID or Servicename for instance. PL/SQL Developer doesn’t supply these options, but you can still use them…
In the logonscreen you can choose the database by choosing you TNS entry. But did you know you can put in the complete text of a tnsnames.ora (more...)
Everyone knows what debt is. If you are in or around the software development community you probably also know the term technical dept. For others:
Technical debt is a concept in programming that reflects the extra development work that arises when code that is easy to implement in the short run is used instead of applying the best overall solution.
Or as Ward Cunningham describes it:
“Shipping first-time code is like going into (more...)
Global Innovation Index 2016
The Global Innovation Index (GII) 2016 is an annual publication which features a composite indicator that ranks countries/economies in terms of their enabling environment to innovation and their innovation outputs. The GII covers 141 economies around the world and uses 79 indicators across a range of themes. The Global Innovation Index 2016 was created by Cornell University, INSEAD, and the World Intellectual Property Organization (WIPO). The theme of the (more...)
Since I published posts on how to retrieve command history within GGSCI using the Oracle provided commands of “history” and “fc”, I was pinged a couple of times by some friends asking about “rlwrap” usage with GoldenGate. The answer is a simple yes, rlwrap can be used with Oracle GoldenGate.
What exactly is “rlwrap”?
According to the readme file at http://utopia.knoware.nl/~hlub/uck/rlwrap/#rlwrap, rlwrap is a ‘read-one wrapper’. (more...)
In this short post you can find examples of how to use IPython/Jupyter notebooks for running SQL on Oracle.IPython/Jupyter notebooks
are one of the leading free platforms for data analysis, with many advantages, notably the interactive
web-based interface and a large ecosystem of readily available packages for data
analysis and visualization
. Moreover IPython/Jupyter notebooks are a very handy format for sharing code
and data as you will see in the examples.See also (more...)
In this post you will find a short discussion and pointers to the code of a few sample scripts that I have written using Linux BPF/bcc and uprobes for Oracle tracing.Previous work and motivations
Tools for dynamic tracing
are very useful for troubleshooting and internals investigations of Oracle
workloads. Dynamic tracing probes on the OS/kernel
, can be used to measure the details for I/O latency for example. Moreover probes on the Oracle (more...)
in this post you can find examples of how to get started with using IPython/Jupyter
notebooks for querying Apache Impala
is an open source massively parallel processing (MPP) SQL Query Engine for Apache Hadoop. This post explores the use of IPython
for querying Impala and generates from the notes of a few tests I ran recently on our systems. For completeness please that that several additional options exist to query Impala, some (more...)
eDB360 has two execution parameters. The first one specifies if the database is licensed to use the Tuning or Diagnostics packs (or none). The second parameter is optional, and if entered it specifies the name of a custom configuration file that allows to change the behavior of eDB360. With this optional configuration file you can make changes such as: reduce the scope of the output to maybe a single column, a section, or even a range (more...)
Introduction and motivations
and dynamic tracing tools in general give administrators great control on their systems with the relatively little additional effort to learn the new tools. In this post you will see of how SystemTap that can be used to modify data on the fly at runtime. The outcome is a form of "live patching". Examples are provided on how to apply these ideas to Oracle SQL parsing functionality. This type of "guru mode" use (more...)
Every so often I need to gain an understanding of an application represented by one or several schemas. In such cases I look at the data model if one exists, else I browse the schema objects including tables, views, pl/sql libraries and extending into synonyms, triggers, sequences, indexes, materialized views and types.
I created a free small tool that installs nothing on the database and it generates a zip file with the most common DDL (more...)
I recently got this question:
<<<Is there a way that I can generate SQL MONITORING report for a particular SQL_ID ( This SQL is generated from application code so I can’t add “MONITOR” hint) from command prompt ? If yes can you please help me through this ?>>>
Since this question is of general interest, I’d rather respond here:
As you know, SQL Monitoring starts automatically on a SQL that executes a PX plan, or when (more...)
is a tool aimed at DBAs and Oracle performance
analysts. It provides a simplified interface to extract and visualize AWR
The reason for a tool like PerfSheet.js is to make the analysis of AWR data easier
by providing a graphical interactive interface and by automating several repetitive steps of data extraction and chart preparation. Pivot charts
provide a flexible and easy to use way to navigate (more...)