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Primary Database in Use – Firebird ?

Survey Results – Primary Database in Use on LewisC’s An Expert’s Guide To Oracle Technology

I’m starting to gather the data from my survey. When I get all the data gathered, I will post it as a downloadable file. Until then, I will post some summary data. This data shows the current PRIMARY database in use at the respondents companies. I find the data suspect and you’ll see why. This data has not been cleaned and duplicate IP addresses have not been removed. This is totally raw data and should remain suspect until after cleansing. Still, it is interesting.

Primary Database

Percentage

Respondents

Oracle

20.38%

65

DB2

5.96%

19

SQL Server

8.78%

28

MySQL

25.39%

81

Teradata

0.31%

1

Ingres

0.00%

0

Postgres

7.21%

23

SimpleDB

0.00%

0

Firebird

25.71%

82

LucidDB

0.00%

0

Vetica

0.00%

0

Sybase

0.63%

2

Netezza

0.31%

1

Access

0.31%

1

Excel

0.63%

2

xBase

0.63%

2

ADABAS

0.00%

0

Alpha 5

0.00%

0

Filemaker

0.00%

0

IMS

0.00%

0

Informix

0.63%

2

SQLite

0.63%

2

Paradox

0.00%

0

Progress

0.00%

0

Other

2.51%

8

I have serious doubts that Firebird is primary database at 25.71% of the respondents. I think I may find some duplicate IP Addresses with that answer. I’m not really surprised at the remainder of the answers though.

I also posted a summary of countries who answered and a few questions on open source software usage.

LewisC

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Multi-file Database ?

Some last database repair cases we did were with multi-file databases. Interesting, that latest InterBase and Firebird versions was used, and also file system for the storage was NTFS, not FAT32 and FAT16. But, the databases was created and maintained using 1 gigabyte files.

[ED: seems that is better to put the database  on an good file system and in an single file ]

Read more

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Random selection, with a bias ..

Say you want to randomly select your employee of the month, but not so randomly, better, you’d like to give your best employees a bigger chance to be selected based on their rating.

This is just an example, you could be randomly displaying ads from your customers, but giving an higher chance to be displayed to those who are paying more, there can be a million other example, but I hope you got the sense of this.

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What page size should I use?

It’s a common question with interesting background from developers . As I can suppose from IBSurgeon statistics, 99% of Firebird and InterBase developers use default page size: since the old ages it is 1024 bytes, and only for Firebird 2.0 it is changed to 4096 by default. There are 4 main things related with page size: indices depth, database cache size, records per page quantity and disk cluster size.

The shortest answer to this question is to use 4k, 8k or 16k page size. That’s it.

If you want to go a bit deeper, keep reading

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