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Closed 11 years ago.
I am a java developer and i will be interviewing sybase dbas along with my boss.
I know some basic stuff about sybase.
Iam looking for good interview questions that i can ask for a sybase dba.
they will be having a min of 4 years of experience.
I am looking for them to have really good knowledge in performance and tuning related areas like how to measure database performance and suggest ways to improve database design or sybase configuration etc.
Interview is through telephone.
Help much appreciated.
BR
This isn't a question, really, but I would set up a (possibly virtual) machine with a large-ish Sybase database on it and then set about screwing it up as badly as I could, and then sit the DBA candidate down in front of it and see what they can do with it.
I plan to do this for my next set of C# candidates, since I place a great deal of value on debugging ability and I can't think of any better way than testing it directly. As a programmer, I would love to do this if I were being interviewed myself. It's sure to weed out at least the people who know less than you do.
This is Microsoft focused but you should be able to glean something from it.
Related
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Closed 10 years ago.
I've recently been tasked with doing some "big data" stuff with an existing Oracle database. The relevant table has 300 million entries, and is ridiculously slow. Are there any good books out there that explain how various options in the DB construction effect the algorithmic scaling (O(n), etc) of various queries? And how different query operations themselves effect scalings?
I'd prefer to get an understanding of how the underlying algorithms work rather than just ad hoc suggestions.
Jonathan Lewis' book on Cost-Based Oracle Fundamentals may be what you're looking for.
For particular techniques regarding querying large data sets the Oracle Data Warehousing documentation would be a good start.
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Closed 10 years ago.
Does anyone know of a good web-based GUI I could use for database design? It is going painfully slow in Photoshop.
You can use MySQL Workbench to do this. There are many web-based apps as well. http://wb.mysql.com/
Try this web-based designer
Just had occasion to use this earlier today: http://www.dbvis.com/
Java/uses JDBC drivers so widely compatible
Produces reasonably pretty relationship diagrams
The free version is still pretty capable, and the cost is eminently reasonable
EDIT: Ah, not web-based, but...somethings you really can't fit into that box very well.
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Closed 10 years ago.
Which database should I use for a medium SaaS CRM? nosql or relational database?
Oracle
Sql Server
CouchDB
etc.
Any suggestions?
Wow, not giving us much to go on there. There are many good DBMS systems out there from the relational to document based to object based. One of the reasons there are so many is they each have advantages and disadvantages in different application scenarios. With so little to go on I'd say use the one you're familiar with unless there's a driving reason to use another.
MYSQL would be a great idea as it is open source and is gaining acceptance in enterprise also.
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Closed 10 years ago.
I consider to use some NoSQL database in one of my project. Do you know some good starting points for a newbie in this topic?
Pick your particular "NoSQL" database first -- or at least type of "NoSQL" -- I'm going with the assumption that there is a reason why you want "NoSQL". Do you need object graph traversal? Explicit distributed clustering? Fast write/append? Dumb key/value associations? The selection should be based off more than a "I want something NoSQL" as different approaches can offer significant advantages (along with significant drawbacks) :-)
And, as often, google/wikipedia are a good place to start:
http://en.wikipedia.org/wiki/NoSQL
http://nosql-database.org/ has a long list of alternative databases, grouped in categories by type of technology. It has links to each product's website, lists of books, and forums, news, etc. about NoSQL.
Also see http://nosqlsummer.org/city/krakow. This is the Kraków chapter of a reading club for studying NoSQL concepts. I see from your profile that you live in Kraków.
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Closed 11 years ago.
I'm obviously not talking about a full solution, but just a good starting point for common applications for software architects. It could be for a CMS, e-commerce storefront, address book, etc. A UML diagram is not essential, but a table schema with data types in the least. Thanks!
Check out the Library of Free Data Models from DatabaseAnswers.org -- might be a good starting point. I can't vouch for the quality, but there is a lot here...
Open source?
DB-UML might work for you.
EDIT:
Oh! The MySQL Workbench is good.
The mondial database. Is used for learning about DBMSs. If you need something quick and dirty to bang around.
try this one... database design document template.
very good and usefull template.
but it isnt free.. you have to buy it.. :(