Scott Lamb eee887b9a6 schema version 1 ... The advantages of the new schema are: * overlapping recordings can be unambiguously described and viewed. This is a significant problem right now; the clock on my cameras appears to run faster than the (NTP-synchronized) clock on my NVR. Thus, if an RTSP session drops and is quickly reconnected, there's likely to be overlap. * less I/O is required to view mp4s when there are multiple cameras. This is a pretty dramatic difference in the number of database read syscalls with pragma page_size = 1024 (605 -> 39 in one test), although I'm not sure how much of that maps to actual I/O wait time. That's probably as dramatic as it is due to overflow page chaining. But even with larger page sizes, there's an improvement. It helps to stop interleaving the video_index fields from different cameras. There are changes to the JSON API to take advantage of this, described in design/api.md. There's an upgrade procedure, described in guide/schema.md.		2016-12-20 22:08:18 -08:00
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schema.md	schema version 1	2016-12-20 22:08:18 -08:00