Think API» Systems

How to create your own UNIX clone Operating System

Sukumar — Tue, 04 Aug 2009 07:11:53 +0000

Working on operating systems can be a lot of fun while learning some of the most difficult concepts in programming. One needs to have a basic set of knowledge and skills such as

Basics of programming: variables, references, data types, scope, pointers, error handling, iteration, core algorithms related to searching, sorting, and so on
Basics of maths and statistics: hexadecimal, binary, boolean logic, probability and so on
Assembly: Knowledge of a low level language is very essential and part of writing an OS
Languages: While C, C++ are the most widely used, one can also go with java, haskell, lisp etc.
Linux / Unix: Experience on linux or UNIX based platforms is needed for using tools required for OS development
Tools: Familiarity in working with compilers, assemblers, linkers and make utility

Getting started:
Alt OS Development FAQ
OS Dev getting started

Resources:
JamesM’s kernel development tutorials
OS development wiki and OS development forums
Tutorials from osdever.net
alt.os.development
Intel® 64 and IA-32 Architectures Software Developer’s Manuals
Intel 80386 Programmer’s Reference Manual
OSRC: The Operating System Resource Center
Implementing an Operating System – By Andrew S. Tanenbaum

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Upgrading to MySQL 5.1 GA? Better Wait

Sukumar — Mon, 01 Dec 2008 04:14:07 +0000

MySQL 5.1 General Availability has been released to the public. While many recommend using it and other don’t, Michael Widenius (Founder and original developer of MySQL) says it might not be worth it yet to upgrade your production databases.

If WTF quotes like,

We have changed the release model so that instead of focusing on quality and features our release is now defined by timeliness and features. Quality is not regarded to be that important.

and

Zero critical bugs is impossible: Sure, zero bugs is desirable. And at times, we internally glorify MySQL’s past, with “production level alpha releases”. Those were the days, but those days also had less complex and less interwoven features, and fewer developers to manage.

I wonder where MySQL is headed.

So as Monty says, you are better off not upgrading to version 5.1 if you do not plan to use its new features, atleast not without testing it for a few weeks.

Links:
Oops, we did it again (MySQL 5.1 released as GA with crashing bugs)
Why You Want to Switch to MySQL 5.1
MySQL 5.1 Stability

How to skip MySQL replication counter There are such times when MySQL replication stops when you...

How to skip MySQL replication counter

Sukumar — Tue, 07 Oct 2008 17:47:59 +0000

There are such times when MySQL replication stops when you run certain updates on the master and the slave fails. Like for example you may have run a create table or an alter table on the master and further inserts but these DDLs get skipped and the inserts into these non-existent tables cause the slave to error out and stop.

A simple way out of this is to run the missing DDLs on the slave and push the counter by a step. This is not recommended as this might cause data inconsistency.

Use the below sql to skip the counter by 1.

SET GLOBAL SQL_SLAVE_SKIP_COUNTER = 1; START SLAVE;

Just remember to use the value 1 for any SQL statement that does not use AUTO_INCREMENT or LAST_INSERT_ID(), otherwise you will need to use the value 2. Statements that use AUTO_INCREMENT or LAST_INSERT_ID() take up 2 events in the binary log.

To skip lots of duplicate errors, you can set this in my.cnf

slave-skip-errors = 1062

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