I’ve mentioned InfiniDB before in a previous post titled, “Star Schema Bechmark: InfoBright, InfiniDB and LucidDB,” but it’s been 4 years since that was published. Recently I evaluated column-storage solutions for Percona Cloud Tools and took another look at InfiniDB 4. There was the release of version 4, which I think is worth attention.
What is interesting in InfiniDB 4:
- Fully OpenSource, GPLv2. There is no reserved features for Enterprise version
- Multiple CPUs are used even for single query execution
- WINDOW functions in SQL queries
What is WINDOW functions? In short, in regular SQL for a given row you can’t access to previous and next rows (at least not without complex SELF JOINS) and WINDOW function allows that.
As a basic example:
SELECT start_ts,
query_time,
LAG(query_time) OVER (ORDER BY start_ts) prev_time
FROM qc
WHERE agent_id = 1;So for given row (start_ts) we access not only current query_time, but also a previous query_time: LAG(query_time). So the result looks like:
start_ts | query_time | prev_sum ---------------------+----------------+---------- 2013-06-18 22:55:00 | 0.281992 | 2013-06-18 23:00:00 | 0.292305 | 0.281992 2013-06-18 23:05:00 | 0.215658 | 0.292305 2013-06-18 23:10:00 | 0.243597 | 0.215658 2013-06-18 23:15:00 | 0.35189 | 0.243597 2013-06-18 23:20:00 | 0.543079 | 0.35189 2013-06-18 23:25:00 | 0.495779 | 0.543079 2013-06-18 23:30:00 | 0.589326 | 0.495779 2013-06-18 23:35:00 | 0.210907 | 0.589326 2013-06-18 23:40:00 | 0.167944 | 0.210907 2013-06-18 23:45:00 | 0.202401 | 0.167944 2013-06-18 23:50:00 | 0.171676 | 0.202401 2013-06-18 23:55:00 | 0.234001 | 0.171676 2013-06-19 00:00:00 | 0.214086 | 0.234001
It gives a lot of interesting possibilities, like calculation of a growth or decline for time periods.
I still continue to evaluate different solutions but I decided to share this about InfiniDB, as it looks quite interesting now.
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