In an earlier (not very serious) post about count(*) I pointed out how the optimizer sometimes does a redundant “bitmap conversion to rowid” when counting. In the basic count(*) example I showed this wasn’t a realistic issue unless you had set cursor_sharing to “force” (or the now-deprecated “similar”).
As Oracle Dba’s we often come across situations where we are handed CSV (Comma separated values) files, by our managers, or customers, as Raw data, based on which we need to do some work. The first task would be to analyze the file and come up with some summary satistics, so we can quantify the amount of work involved.
I will be talking in Rocky Mountain Oracle User Group Training Days 2015( http://www.rmoug.org), with live demos (hopefully there will be no failures in the demo). My topics are:
Feb 17: Deep dive: 3:15PM to 5:15PM – RAC 12c optimization: I will discuss RAC global cache layer in detail with a few demos. You probably can’t find these deep Global Cache layer details anywhere else :)
Performance schema, as name suggest is a tool for monitoring MySQL performance. It was implemented staring from MySQL 5.5 and improved further in MySQL 5.6. Performance Schema includes set of tables that gives information on how database is performing. It provides a way to inspect internal execution of the server at run time. Performance schema monitors every “event” the server does that takes time and has been instrumented so that timing information can be collected. It is implemented using the PERFORMANCE_SCHEMA storage engine and the performance_schema database.
It's webinar time again.
Join me on Wednesday, January 28th at AllThingsOracle.com for a session based on a real world customer experience.
The session starts at 3pm UK (16:00 Central European) time. The webinar is totally free and the recording will made available afterwards.
Here's the link to the official landing page where you can register and below is the official abstract:
x_migration_status OUT varchar2
Please join us next friday for our 1st 2015 regular meeting. Mark Rabne our resident Oracle technical geek will be taking us through major 2014 Oracle technology and application announcements. Kind of a recap of Oracle Open World 2014 major items plus some additional ones after that.
It's the usual deal at the Rockside Road Oracle office so free lunch at noon and networking opportunities. Meeting starts at 1 pm.
Our March meeting will be Big Data ish related ( and we have a great announcement coming up on a workshop for our May GLOC 2015 conference ).
This is the third article of a series that focuses on database security. In my introduction, I provide an overview of the database protection process and what is to be discussed in future installments. In last month’s article, we began with a review of the various database vulnerabilities and threat vectors we need to address. In this article, we’ll finish our discussion of the most common threats and vulnerabilities.