[vdr] Request: E parameter in channels.conf for epg scan

Luca Olivetti luca at ventoso.org
Wed Dec 15 18:21:35 CET 2010

Al 15/12/10 00:19, En/na VDR User ha escrit:
> On Tue, Dec 14, 2010 at 12:56 PM, Luca Olivetti<luca at ventoso.org>  wrote:
>> Instead of speculating I actually tried.
>> I created a test database with the contents of my channels.conf (only
>> containing the number, name, frequency, source, symbol rate and the vpid, I
>> don't think adding all the fields would change the result considerably).
> Why would you do a test and intentionally discard necessary data
> fields?  If you're not going to run tests using _all_ the actual data,
> don't bother.

Because, without indexes, sqlite will do a linear scan, so, e.g., 
doubling the data per record, will roughly double the time, and the 
double of "imperceptible" is "too little to notice".
But that anyway would be offset by using indexes and optimizing the data 
types (e.g. in my query I used strings for parameters and source, and 
those are very inefficient, intentionally so, just to show that sqlite 
wouldn't be a bottleneck).


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