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Showing entries 1 to 18

Displaying posts with tag: reporting (reset)

Exploring SAP HANA – Powering Next Generation Analytics
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SAP HANA , having entered the data 2.0/3.0 space at the right time, has been getting traction lately; and there will be lot of users like me who wants to[...]
Extending Reporting Services
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I am doing a reporting proof-of-concept (POC) for my company. Business intelligence (BI) is often the last thing that gets thought of during an application’s life cycle because it’s only really necessary after you get customers. Before that, the main focus is on application features. Soon after launch, your coworkers and your customers start asking questions about usage and adoption, and customers start to ask for summary information on their data as well as just dumping their data. If you’re the only guy in charge of the database, this is often overwhelming.

Thankfully, we now have many options for what’s called self-service BI. The developer or DBA sets up the basic data models (say Orders) in an automated tool like SQL Server Reporting Services (SSRS) and then allows an

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MySQL Cluster to InnoDB Replication Howto
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In this blog post I will show you how to setup a replication from MySQL Cluster  (ndbcluster) to a regular MySQL Server (InnoDB). If you want to understand the concepts, check out part 7 of our free MySQL Cluster training.

First of all we start with a MySQL Cluster looking like this, and what we want to do is to setup replication server to the Reporting Server (InnoDB slave).

0 0 1 125 713 Severalnines AB 5 1 837 14.0 Normal 0 false false false EN-US JA X-NONE

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Unqualified COUNT(*) speed PBXT vs InnoDB
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So this is about a SELECT COUNT(*) FROM tblname without a WHERE clause. MyISAM has an optimisation for that since it maintains a rowcount for each table. InnoDB and PBXT can’t do that (at least not easily) because of their multi-versioned nature… different transactions may see a different number of rows for the table table!

So, it’s kinda known but nevertheless often ignored that this operation on InnoDB is costly in terms of time; what InnoDB has to do to figure out the exact number of rows is scan the primary key and just tally. Of course it’s faster if it doesn’t have to read a lot of the blocks from disk (i.e. smaller dataset or a large enough buffer pool).

I was curious about PBXT’s performance on this, and behold it appears to be quite a bit faster! For a table with 50 million rows, PBXT

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Kontrollbase – revision 297 fixes Reporter-CLI “alert_22″ sub-routine
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Quick note to let our users know that there was an XML tag closure error on the “alert_22″ subroutine in the “bin/kontroll-reporter-cli.pl” script. This does not affect the webapp portion of Kontrollbase – only reports generated via the command line reporter script. It is not a fatal error but will cause the XML file to […]
Kontrollbase – graph “no data to display” on new install has been fixed
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If you have been wondering why the overview and graphs pages say “no data to display” on the graphs when you first install Kontrollbase, it’s because there’s no data in the database being returned from the queries that generate the graphs – this is because a new install has no data to graph. This has […]
Kontrollsoft’s uptime checks now managed by Pingdom
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Website health checks are a crucial service to an operations team. In addition to in-house monitoring and service state reporting it’s also important, even critical, to have an impartial third party to run checks to test your customer facing services. There are a lot of companies in this arean that would be glad to have [...]
Advanced reporting options for MySQL
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I’m seeking help from the MySQL community for what tools are used today to generate complex reports for enterprise applications that use MySQL. In an Oracle world, you have Oracle Report Writer, in Microsoft Crystal Reports.

In the open source world there is Jasper Reports, Pentaho Reports and BIRT however I don’t know the power of complex reporting with these.

If anybody has experience using or evaluating these tools please let me know. This may lead to possible work.

Kontrollbase – queries to update your max_connections alert
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If you have been reading the Kontrollbase performance reports and noticed that one alert says your connection usage vs max connections ration is too high but then recommends you to decrease the max_connections variable, then you will find this fix handy. Its two simple queries that execute on the Kontrollbase schema to update the max_connections [...]
Kontrollbase – scripts being rewritten in Python, request improvements now!
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The time has come for major performance improvements to the reporter, stats-gather, alerter, and client scripts. This means that I will be rewriting the scripts in Python. A couple of reasons for this; to cut down on the number of modules that are required for the installation process (which also makes distributing the client script [...]
Kontrollbase 2.0.1 revision 281 available for download
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A new version of Kontrollbase – the enterprise monitoring, analytics, reporting, and historical analysis webapp for MySQL database administrators and advanced users of MySQL databases – is available for download. See the downloads page or run “svn update” to get your new version today. http://kontrollsoft.com/software-downloads
Advanced analytics report added to Kontrollbase CLI-reporter
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It didn’t take long, but the advanced analytics reporting code has been added to the command line reporter version of Kontrollbase. Click here to see an example of the tuning and analytics report output (html format). Now you have all of the reporting features (minus the growth over time) features that are offered in the [...]
Kontrollbase revision 270 is available for download
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The latest version of Kontrollbase – the opensource enterprise MySQL analytics and performance tuning application –  is available for download. Since the previous one, version 225, there have been a lot of great changes. The most significant being the development and inclusion of the Reporter CLI script – which is a combination of the client, [...]
Kontrollbase gets more environment statistics
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More stats for your consumption! Here are the latest additions to the environment overview reporting features. On the overview page, as of revision 238, you will find the following data for your servers. Update your revision now using ’svn update’ to get the new features or wait until the next formal release if you are [...]
Reporting Queries with Sphinx
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Reporting queries (I will use this term here) are the queries which summaries and groups data over the certain period of time. For example, in Social Network site we want to know how many messages have been sent for the given period of time, group by region and status (sent, received, etc), order by number of messages sent.

As an example I will take a table which is used to send SMS (text messages).

SQL: select concat('+', substring(region_code,1 ,2), 'xxx') as reg, status, count(*) as cnt
from messages
where submition_date between '2009-01-01' and '2009-04-01' group by reg, status
having cnt>100 order by cnt desc, status limit 100;

This query will do a range scan over the submition_date and perform a filesort. There are common well known approaches which can be used to optimize table

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On the reporting engine, and a new name - Kontrollbase
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Update for all of those that are following the progress of Monolith. I’ve been busy this week coding the reporting engine - the code that analyses the hundreds of variables that are being collected - and I’m pleased to say that Perl was the correct choice for this application.Installation on the client servers will be a breeze, and relatively few non-standard modules are required for the server application.

I’ve been silently wondering for some time if the reporting engine equations should be part of a pluggable system (stored in the database) or if they should be hard coded. After writing up all of the equations, I’ve come to the conclusion that, for a quicker release, the equations and reporting engine will be hard-coded this time around for the default system alerts. Howeve -> user-defined alerts will be pluggable. Revisions ahead of 2.0 might feature pluggable main

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Parallel mysqldump backup script available. Testers wanted.
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Large databases, long mysqldump times, long waits for globally locked tables. These problems basically never go away when you rely on mysqldump with –all-databases or a list of databases, as it dumps schemas serially. I’m not going to explain serial vs parallel processing here since that’s a larger topic. Suffice to say that in these days of multi-core / multi-cpu servers we only make use of one processor’s core when we serially export databases using mysqldump. So, I have a new script that attempts to alleviate those issues and now I need testers to provide feedback/improvements.


In order to keep some sanity when dealing with hundreds of database servers, the script takes care of the following:

  • low global locking time requirements: solved by parallel tasks / forked processes
  • backup file checking: with
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    InnoDB's Suitability for Reporting
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    I started using Oracle, a MVCC database, to develop reporting (data warehousing, BI, take your pick) systems years ago.  I’ve come to appreciate the scalability improvements that MVCC provides, particularly for pseudo real-time reporting applications, the ones where loads are occurring at the same time as report generation.  So when people say InnoDB, partly due to MVCC, isn’t as good as MyISAM for reporting I had to look into this in more detail.

    What I found is InnoDB is a good engine for reporting.  In some ways, such as performance, it is at times better than MyISAM, and one of the downsides, such as a larger disk requirement, can be mitigated.  The trick is to for the primary key to be the one predominant access path.  In this example, the InnoDB clustered index, is purchaseDate and another column,

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    Showing entries 1 to 18

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