Difference between revisions of "MongoDB"

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= Mongo =
 
  
== Install MongoDB on ubuntu ==
+
= Development =
From: https://docs.mongodb.org/manual/tutorial/install-mongodb-on-ubuntu/
+
== rename a field, or paste one field to another collection-wide ==
 
+
Methods are: updateOne, updateMany or update
sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv EA312927
+
<pre>
echo "deb http://repo.mongodb.org/apt/ubuntu trusty/mongodb-org/3.2 multiverse" | sudo tee /etc/apt/sources.list.d/mongodb-org-3.2.list
+
db.collection.<update method>(
sudo apt-get update -y
+
    {},
sudo apt-get install -y mongodb-org
+
    [
 +
        {"$set": {"name": { "$concat": ["$firstName", " ", "$lastName"]}}}
 +
    ]
 +
)
 +
</pre>
  
 
== Count Documents ==
 
== Count Documents ==
Line 18: Line 21:
 
</pre>
 
</pre>
  
== Performance Tuning ==
+
 
 +
= Install MongoDB on ubuntu =
 +
From: https://docs.mongodb.org/manual/tutorial/install-mongodb-on-ubuntu/
 +
 
 +
This is probably obsolete.
 +
 
 +
sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv EA312927
 +
echo "deb http://repo.mongodb.org/apt/ubuntu trusty/mongodb-org/3.2 multiverse" | sudo tee /etc/apt/sources.list.d/mongodb-org-3.2.list
 +
sudo apt-get update -y
 +
sudo apt-get install -y mongodb-org
 +
 
 +
 
 +
= Performance Tuning =
  
 
  db.getProfilingStatus()
 
  db.getProfilingStatus()

Revision as of 19:10, 20 October 2021

Development

rename a field, or paste one field to another collection-wide

Methods are: updateOne, updateMany or update

db.collection.<update method>(
    {},
    [
        {"$set": {"name": { "$concat": ["$firstName", " ", "$lastName"]}}}
    ]
)

Count Documents

db.collection.aggregate(
  [
    { $group: { _id: null, count: { $sum: 1 } } }
  ]
)


Install MongoDB on ubuntu

From: https://docs.mongodb.org/manual/tutorial/install-mongodb-on-ubuntu/

This is probably obsolete.

sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv EA312927
echo "deb http://repo.mongodb.org/apt/ubuntu trusty/mongodb-org/3.2 multiverse" | sudo tee /etc/apt/sources.list.d/mongodb-org-3.2.list
sudo apt-get update -y
sudo apt-get install -y mongodb-org


Performance Tuning

db.getProfilingStatus()
db.getProfilingLevel()
db.setProfilingLevel(1, 10)
db.getCollection('system.profile').find({})

add member to cluster

operaeventrsX:PRIMARY> rs.add("10.138.96.89")
operaeventrsX:PRIMARY> rs.conf()

profiling

Profiling. From: https://docs.mongodb.com/manual/reference/method/db.setProfilingLevel/

The profiler writes all the data it collects to the system.profile collection, a capped collection in the admin database.

db.getProfilingStatus()
# db.setProfilingLevel(level, options)
db.setProfilingLevel(1, { "slowms": 500 })
db.enableFreeMonitoring()
use creek_development
db.setProfilingLevel(1, { "slowms": 500 })
db.getCollection('system.profile').find({}).sort({"ts": -1}).limit( 5 )
db.lineitems.getIndexes()