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links for 2010-09-06

• redis
  Redis is an advan­ced key-value store. It is simi­lar to mem­ca­ched but the data­set is not vola­tile, and values can be strings, exac­tly like in mem­ca­ched, but also lists, sets, and orde­red sets. All this data types can be mani­pu­la­ted with ato­mic ope­ra­tions to push/pop ele­ments, add/remove ele­ments, per­form ser­ver side union, inter­sec­tion, dif­fe­rence bet­ween sets, and so forth. Redis sup­ports dif­fe­rent kind of sor­ting abilities.

  In order to be very fast but at the same time per­si­stent the whole data­set is taken in memory, and from time to time saved on disc asyn­chro­nou­sly (semi per­si­stent mode) or alter­na­ti­vely every change is writ­ten into an append only file (fully per­si­stent mode). Redis is able to rebuild the append only file in back­ground when it gets too big.

  (tags: data­ba­ses distri­bu­ted sca­la­bi­lity soft­ware)

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