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This is the tag for mongodb version 3.0

2
votes
The .ns file is the file in which MongoDB stores the namespaces of a database. So most likely, what you have is not a dump, but a copy of the datafiles of a single database. Note that this most likely …
answered Dec 15 '15 by Markus W Mahlberg
2
votes
You created the user correctly, but you missed a parameter when connecting to mongod. By default, the authentication process assumes that the user is stored in the database you connect to, which in y …
answered Aug 11 '15 by Markus W Mahlberg
1
vote
The reason The answer is quite simple: when two voting nodes of three are down, the remaining one reverts to secondary, to which – by definition – one can't write. The default read preference is to r …
answered Aug 28 '15 by Markus W Mahlberg
1
vote
You have a misconception here. Replica sets, albeit you can distribute some read load, are not mongodb means of load distribution. That would be a sharded cluster. As @hashavmb has explained in detai …
answered Jan 1 '16 by Markus W Mahlberg
26
votes
Personally, I prefer the mmapv1 storage engine as of now for three reasons. Reason 1: Maturity It isn't that WiredTiger is immature. But mmapv1 is well understood and battle tested all way up and do …
answered Nov 15 '15 by Markus W Mahlberg
2
votes
RAM, mainly. Every connection gets a stack allocated, at the size of 1MB. The more connections you have, the more RAM is needed for them and the less RAM is available for keeping indices or the workin …
answered Nov 3 '15 by Markus W Mahlberg
1
vote
First of all I heavily doubt that you config servers build a replica set. By default, config servers are three single instances, which is important to find metadata deviations. If you set up a replica …
answered Feb 23 '16 by Markus W Mahlberg
1
vote
What happened I have asked in the comments of the question that OP provides the output of rs.status() The reason for that was that the primary reverted to secondary status once a single member was s …
answered Nov 30 '15 by Markus W Mahlberg
5
votes
Typically, you don't. Thinking of your nodes in terms of primary or secondary is the wrong way to approach it. Since standard data bearing nodes should have the same dimensions, it is better to think …
answered Apr 26 '16 by Markus W Mahlberg
2
votes
On your indices Ok, first things first. Assuming some structure like this { _id: new ObjectId(), date: new ISODate(), message: "Hello, Multikey Indices!", tags: ["MongoDB","Indices","Multike …
answered Aug 28 '15 by Markus W Mahlberg
0
votes
Misconceptions "It is the best way to ensure data integrity to have MongoDB write to all nodes." This is entirely wrong. Let's assume you have three members in a replica set. Well, you want the …
answered Sep 8 '15 by Markus W Mahlberg