gharriso

     {
         "$graphLookup": {
             "from": "< name of collection to look up  >",
             "startWith": "< expression >",
             "connectFromField": "< 'from' side of the lookup >",
             "connectToField": "< 'to' side of the lookup >",
             "as": "< name of field in output document > ",
             "maxDepth": "< optional - max recursion level > ",
             "depthField": "< optional - recursion depth variable >"
         }

gharriso

     {
         "$graphLookup": {
             "from": "< name of collection to look up  >",
             "startWith": "< expression >",
             "connectFromField": "< 'from' side of the lookup >",
             "connectToField": "< 'to' side of the lookup >",
             "as": "< name of field in output document > ",
             "maxDepth": "< optional - max recursion level > ",
             "depthField": "< optional - recursion depth variable >"
         }

gharriso

db.getSiblingDB("GraphTest").socialGraph.findOne();
{
	"_id" : ObjectId("5a739cda0c31c5f5afcff87f"),
	"person" : 561596,
	"name" : "User# 561596",
	"friends" : [
		94230,
		224410,
		387968,
		406744,

gharriso

assert: command failed: {
     "ok" : 0,
     "errmsg" : "$graphLookup reached maximum memory consumption",
     "code" : 40099
  } : aggregate failed

gharriso

function missrate(intervalMs) {
  var statsStart = db.serverStatus().wiredTiger.cache;
  var startTime = new Date();

  sleep(intervalMs);

  var endTime = new Date();
  var statsEnd = db.serverStatus().wiredTiger.cache;

  var logicalReads =

gharriso

Let's have a look at how provenDB operates. You'll need to be somewhat familiar with MongoDB to follow along, since we'll use the mongoDB command shell to demonstrate. If you're not familiar with MongoDB (or even if you are) you might like to look at the MongoDB getting started tutorial.

Create-Read-Update-Delete (CRUD)

You can use normal MongoDB commands to create, read and modify documents. In this example we will use the MongoDB command line shell (available from mongodb.com).

For starters, let's create a few documents:

mongo > db.tutorial.insertMany([{name:"Guy",rating:10},{name:"Mike",rating:9}]);

gharriso

mongo> db.runCommand({getVersion:1});
{
        "ok" : 1,
        "response" : "The version is set to: 'current'",
        "version" : NumberLong(10206),
        "status" : "current"
}

gharriso

# 
# provenFiles.sh:  Store files into a ProvenDB database using `mongofiles`
#    optionally sign using a private key
#    submit a Blockchain Proof once the files are loaded
#
# Usage: provenFiles.sh -u ProvenDBUri -k keyFile fileSpecification mongoFilesArgs
#
# Author: guy.a.harrison@gmail.com
# License: AGPL
#

gharriso

//db.adminCommand( { setFeatureCompatibilityVersion: "4.2" } );
use wildcard
db.noIndex.drop();
db.singleIndex.drop();
db.manyIndexes.drop();
db.wildcardIndex.drop();

var i = 0;
var docs = [];

gharriso

	for i := 1; i <= maxId; i++ {
		rows, err := db.Query(fmt.Sprintf("SELECT * FROM %s WHERE id=:1", tableName), i)
		if err != nil {
			fmt.Println(err)
		}
		rows.Close()
	}