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March 2013

Concurrency and synchronisation in POSIX Bourne shell

It seems like ages ago now that I found my customer had a process that connected to hundreds of Oracle databases to run predefined SQL for health checks. These databases were hosted all over the world and the SQL could take up to fifteen minutes to complete for a single database (with huge amounts of TNS timeouts). The end result was a CSV file that was ultimately formatted into a spreadsheet to provide management information. It took about a day to obtain this final result.

I thought there was a better way.

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NoSQL databases, now 'ACID' compliant?

A well-known problem with NoSQL databases in general is that they do not support the 'ACID' principals held dear by traditional RDBMS DBAs. The Register is reporting that this may soon change with FoundationDB. Atomicity ensures that a transaction is saved or undone, but never exists halfway between the two states. Consistency ensures that only valid data can be stored. Isolation of transactions prevents one transaction interfering with another.

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