Some time ago, we were encountering a JDBC connection reset quite frequently in a standalone Java job that was being kicked off every 5 mins from cron.
Bits and Pieces
Thursday, March 13, 2014
Friday, August 30, 2013
Encryption, Compression and Randomness - Part 2
In Part 1 we took a look at compression and encryption of text data with the aim of illustrating why compression should be done prior to encryption. A natural follow up is to try similar things on binary data and see what we find.
Tuesday, August 27, 2013
Encryption, Compression and Randomness - Part 1
One often comes across
situations where data has to be compressed for size reduction and also encrypted for security. But should you first
compress and then encrypt ? Or should it be done in reverse i.e. encrypt and then compress ?
Thursday, September 16, 2010
Fun with recursion in Java
Hanoi.java contains a routine textbook solution to the familiar Towers of Hanoi problem. Upon compiling it and running it ( java Hanoi > out.txt), the execution times for the various numbers of discs are printed out as follows
Wednesday, July 21, 2010
A tale of two SCNs
A few weeks ago, I had the opportunity to investigate an issue on a live system where a regular J2EE web application was hitting the well-known error ORA-01555: snapshot too old: rollback segment number <number> with name <name> too small . But in this particular case, it was accompanied by an ORA-02063, which means that the error was received from a database link. Folks with Oracle dblink experience are probably aware that unexpected traps lurk beneath the attractive abstraction that dblinks provide. A snapshot too old on a dblink - that had to be interesting !
Monday, July 19, 2010
A signed root zone and an NSEC adventure
On 15-July-2010, the root zone of the Domain Name System was DNSSEC-enabled. The details of this effort, which was underway for some time, are outlined at http://www.root-dnssec.org. The signing of the root is regarded as an important step towards a broader DNSSEC deployment across the internet.
Monday, June 7, 2010
ssh Timeouts
Some time back I was encountering annoying timeouts on ssh sessions and came to know some useful details in the process of getting it resolved.
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