Re: [Xlog-discussion] xlog-0.9 released

[Nate Bargmann]

* Eric S. Johansson <address@hidden> [2003 Nov 12 15:18 -0600]:

> from: http://www.sleepycat.com/docs/ref/am/second.html
> 
> A secondary index, put simply, is a way to efficiently access records in 
> a database (the primary) by means of some piece of information other 
> than the usual (primary) key. In Berkeley DB, this index is simply 
> another database whose keys are these pieces of information (the 
> secondary keys), and whose data are the primary keys. Secondary indices 
> can be (and often are) created manually by the application; there is no 
> disadvantage, other than complexity, to doing so. However, when the 
> secondary key can be mechanically derived from the primary key and datum 
> that it points to, as is frequently the case, Berkeley DB can 
> automatically and transparently manage secondary indices.
> 
> so pick some data to be the primary key (i.e. call sign) and then create 
> multiple secondary keys of all the others in a way that can be managed 
> by sleepy cat.  It will be interesting to see if sleepy cat secondary 
> indices can handle redundant keys

Obviously I didn't find that!

See my later message on another library I found.

73, de Nate >>

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