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[10:44:24] <Alucard_> Hi -- How to use references on PHP

[10:46:20] <Alucard_> I have "Lists" and "Attendees" collections. In Lists collection there are lists (obviously) and I think I can put a reference to attendees into these list documents

[11:04:48] <skirton> Is it possible to use the $in comparison operator at the $project or $match stages of an aggregation query?

[11:37:19] <Alucard_> How to search for all references in a document on PHP?

[12:22:41] <nohitall> HI guys, whats best backup method if I need backups as often as possible e.g. every 30min?

[12:22:53] <nohitall> also does mongodump affect the running db? or is it hot backup

[12:23:21] <nohitall> guess safest way is to use with --oplog

[17:29:46] <xieta> Hello, I went through Mongo certification a few years ago and had a good time. Now, I'm using Mongo with an application and as the collection is being populated, I'm starting to see performance problems. I was wondering if there is some good knobs to turn for internal buffers and such or a recommendation for a good performance analysis script.

[17:31:36] <xieta> If it helps in wild guesses - the app worked great with Mongo v2.6 but is falling over w/ Mongo v3.6.3. At first I thought maybe switching back to mmapv1 storage engine would be what was needed to restore the performance - but I was wrong.

[21:35:08] <yvear> for the `count of operations` here https://docs.mongodb.com/manual/reference/command/top is it the `count` since the server started?