From Dayton Dynamic Languages Nov 13 meeting on MongodDB

ddl-mongo-intro,ipynb

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 "nbformat": 3,
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 "worksheets": [
  {
   "cells": [
    {
     "cell_type": "heading",
     "level": 1,
     "metadata": {},
     "source": [
      "MongoDB"
     ]
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Like an RDBMS"
     ]
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "- uses a client and a server\n",
      "- cross-language access"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "%%script mongo\n",
      "show dbs"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "MongoDB shell version: 2.4.6\n",
        "connecting to: test\n",
        "bronto\t7.9501953125GB\n",
        "five\t0.203125GB\n",
        "google_analytics\t19.9443359375GB\n",
        "local\t0.078125GB\n",
        "netsuite\t3.9521484375GB\n",
        "small\t0.203125GB\n",
        "test\t0.203125GB\n",
        "v\t0.203125GB\n",
        "bye\n"
       ]
      }
     ],
     "prompt_number": 4
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "%%script mongo dayton\n",
      "db.dropDatabase()"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "MongoDB shell version: 2.4.6\n",
        "connecting to: dayton\n",
        "{ \"dropped\" : \"dayton\", \"ok\" : 1 }\n",
        "bye\n"
       ]
      }
     ],
     "prompt_number": 3
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Different jargon"
     ]
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "- Database -> database\n",
      "- Table (or relation) -> collection\n",
      "- Row (or tuple) -> document"
     ]
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Schemaless: Mentioning it is creating it"
     ]
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "Handy and terrifying"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "%%script mongo\n",
      "use dayton;\n",
      "db.members.insert({'name': 'Ken', 'language': 'Perl'})"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "MongoDB shell version: 2.4.6\n",
        "connecting to: test\n",
        "switched to db dayton\n",
        "bye\n"
       ]
      }
     ],
     "prompt_number": 5
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "%%script mongo\n",
      "show dbs;\n",
      "use dayton;\n",
      "show collections;"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "MongoDB shell version: 2.4.6\n",
        "connecting to: test\n",
        "bronto\t7.9501953125GB\n",
        "dayton\t0.203125GB\n",
        "five\t0.203125GB\n",
        "google_analytics\t19.9443359375GB\n",
        "local\t0.078125GB\n",
        "netsuite\t3.9521484375GB\n",
        "small\t0.203125GB\n",
        "test\t0.203125GB\n",
        "v\t0.203125GB\n",
        "switched to db dayton\n",
        "members\n",
        "system.indexes\n",
        "bye\n"
       ]
      }
     ],
     "prompt_number": 8
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "%%script mongo\n",
      "use dayton;\n",
      "db.members.find()"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "MongoDB shell version: 2.4.6\n",
        "connecting to: test\n",
        "switched to db dayton\n",
        "{ \"_id\" : ObjectId(\"528418c9b8fa004981577216\"), \"name\" : \"Ken\", \"language\" : \"Perl\" }\n",
        "bye\n"
       ]
      }
     ],
     "prompt_number": 9
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Structure in documents"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "%%script mongo dayton\n",
      "db.members.insert({name: \"Grant\", language: [\"PHP\", \"Perl\"]})\n",
      "db.members.find()"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "MongoDB shell version: 2.4.6\n",
        "connecting to: dayton\n",
        "{ \"_id\" : ObjectId(\"528418c9b8fa004981577216\"), \"name\" : \"Ken\", \"language\" : \"Perl\" }\n",
        "{ \"_id\" : ObjectId(\"52841a211de978769fc0ce4c\"), \"name\" : \"Grant\", \"language\" : [  \"PHP\",  \"Perl\" ] }\n",
        "bye\n"
       ]
      }
     ],
     "prompt_number": 10
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "%%script mongo dayton\n",
      "bob = {name: \"Bob\", language: \"Python\", \n",
      "       spouse: {\"name\": \"\"},\n",
      "       pets: [{\"name\": \"Fido\", \"species\": \"dog\"}, \n",
      "                {\"name\": \"Sonic\", \"species\": \"hedgehog\"}]\n",
      "       };\n",
      "db.members.insert(bob)"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "MongoDB shell version: 2.4.6\n",
        "connecting to: dayton\n",
        "{\n",
        "\t\"name\" : \"Bob\",\n",
        "\t\"language\" : \"Python\",\n",
        "\t\"spouse\" : {\n",
        "\t\t\"name\" : \"\"\n",
        "\t},\n",
        "\t\"pets\" : [\n",
        "\t\t{\n",
        "\t\t\t\"name\" : \"Fido\",\n",
        "\t\t\t\"species\" : \"dog\"\n",
        "\t\t},\n",
        "\t\t{\n",
        "\t\t\t\"name\" : \"Sonic\",\n",
        "\t\t\t\"species\" : \"hedgehog\"\n",
        "\t\t}\n",
        "\t]\n",
        "}\n",
        "bye\n"
       ]
      }
     ],
     "prompt_number": 11
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "%%script mongo dayton\n",
      "db.members.find()"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "MongoDB shell version: 2.4.6\n",
        "connecting to: dayton\n",
        "{ \"_id\" : ObjectId(\"528418c9b8fa004981577216\"), \"name\" : \"Ken\", \"language\" : \"Perl\" }\n",
        "{ \"_id\" : ObjectId(\"52841a211de978769fc0ce4c\"), \"name\" : \"Grant\", \"language\" : [  \"PHP\",  \"Perl\" ] }\n",
        "{ \"_id\" : ObjectId(\"52841a91b57f8e18a0ac79a7\"), \"name\" : \"Bob\", \"language\" : \"Python\", \"spouse\" : { \"name\" : \"\" }, \"pets\" : [ \t{ \t\"name\" : \"Fido\", \t\"species\" : \"dog\" }, \t{ \t\"name\" : \"Sonic\", \t\"species\" : \"hedgehog\" } ] }\n",
        "bye\n"
       ]
      }
     ],
     "prompt_number": 12
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "finding"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "%%script mongo dayton\n",
      "db.members.find({pets: [ \t{ \t\"name\" : \"Fido\", \t\"species\" : \"dog\" }, \t{ \t\"name\" : \"Sonic\", \t\"species\" : \"hedgehog\" } ]});"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "MongoDB shell version: 2.4.6\n",
        "connecting to: dayton\n",
        "{ \"_id\" : ObjectId(\"52841a91b57f8e18a0ac79a7\"), \"name\" : \"Bob\", \"language\" : \"Python\", \"spouse\" : { \"name\" : \"\" }, \"pets\" : [ \t{ \t\"name\" : \"Fido\", \t\"species\" : \"dog\" }, \t{ \t\"name\" : \"Sonic\", \t\"species\" : \"hedgehog\" } ] }\n",
        "bye\n"
       ]
      }
     ],
     "prompt_number": 17
    },
    {
     "cell_type": "heading",
     "level": 3,
     "metadata": {},
     "source": [
      "indexing"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "%%script mongo dayton\n",
      "db.members.find({name: \"Grant\"}).explain();"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "MongoDB shell version: 2.4.6\n",
        "connecting to: dayton\n",
        "{\n",
        "\t\"cursor\" : \"BasicCursor\",\n",
        "\t\"isMultiKey\" : false,\n",
        "\t\"n\" : 1,\n",
        "\t\"nscannedObjects\" : 3,\n",
        "\t\"nscanned\" : 3,\n",
        "\t\"nscannedObjectsAllPlans\" : 3,\n",
        "\t\"nscannedAllPlans\" : 3,\n",
        "\t\"scanAndOrder\" : false,\n",
        "\t\"indexOnly\" : false,\n",
        "\t\"nYields\" : 0,\n",
        "\t\"nChunkSkips\" : 0,\n",
        "\t\"millis\" : 0,\n",
        "\t\"indexBounds\" : {\n",
        "\t\t\n",
        "\t},\n",
        "\t\"server\" : \"elli:27017\"\n",
        "}\n",
        "bye\n"
       ]
      }
     ],
     "prompt_number": 18
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "%%script mongo dayton\n",
      "db.members.ensureIndex({pets: 1});\n",
      "db.members.find({name: \"Grant\"}).explain();"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "MongoDB shell version: 2.4.6\n",
        "connecting to: dayton\n",
        "{\n",
        "\t\"cursor\" : \"BtreeCursor name_1\",\n",
        "\t\"isMultiKey\" : false,\n",
        "\t\"n\" : 1,\n",
        "\t\"nscannedObjects\" : 1,\n",
        "\t\"nscanned\" : 1,\n",
        "\t\"nscannedObjectsAllPlans\" : 1,\n",
        "\t\"nscannedAllPlans\" : 1,\n",
        "\t\"scanAndOrder\" : false,\n",
        "\t\"indexOnly\" : false,\n",
        "\t\"nYields\" : 0,\n",
        "\t\"nChunkSkips\" : 0,\n",
        "\t\"millis\" : 0,\n",
        "\t\"indexBounds\" : {\n",
        "\t\t\"name\" : [\n",
        "\t\t\t[\n",
        "\t\t\t\t\"Grant\",\n",
        "\t\t\t\t\"Grant\"\n",
        "\t\t\t]\n",
        "\t\t]\n",
        "\t},\n",
        "\t\"server\" : \"elli:27017\"\n",
        "}\n",
        "bye\n"
       ]
      }
     ],
     "prompt_number": 20
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "updating"
     ]
    },
    {
     "cell_type": "heading",
     "level": 3,
     "metadata": {},
     "source": [
      "danger!"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "%%script mongo dayton\n",
      "db.members.find({name: \"Bob\"})"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "MongoDB shell version: 2.4.6\n",
        "connecting to: dayton\n",
        "{ \"_id\" : ObjectId(\"52841a91b57f8e18a0ac79a7\"), \"name\" : \"Bob\", \"language\" : \"Python\", \"spouse\" : { \"name\" : \"\" }, \"pets\" : [ \t{ \t\"name\" : \"Fido\", \t\"species\" : \"dog\" }, \t{ \t\"name\" : \"Sonic\", \t\"species\" : \"hedgehog\" } ] }\n",
        "bye\n"
       ]
      }
     ],
     "prompt_number": 21
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "%%script mongo dayton\n",
      "db.members.update({name: \"Bob\"}, {cm: 180});"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "MongoDB shell version: 2.4.6\n",
        "connecting to: dayton\n",
        "bye\n"
       ]
      }
     ],
     "prompt_number": 22
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "%%script mongo dayton\n",
      "db.members.find();"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "MongoDB shell version: 2.4.6\n",
        "connecting to: dayton\n",
        "{ \"_id\" : ObjectId(\"528418c9b8fa004981577216\"), \"name\" : \"Ken\", \"language\" : \"Perl\" }\n",
        "{ \"_id\" : ObjectId(\"52841a211de978769fc0ce4c\"), \"name\" : \"Grant\", \"language\" : [  \"PHP\",  \"Perl\" ] }\n",
        "{ \"_id\" : ObjectId(\"52841a91b57f8e18a0ac79a7\"), \"cm\" : 180 }\n",
        "bye\n"
       ]
      }
     ],
     "prompt_number": 23
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "Note that, by default, only one document is updated.  Fourth arg = true enables multi-update."
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "%%script mongo dayton\n",
      "db.members.update({name: \"Grant\"}, {$set: {cm: 180}}, true, true);"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "MongoDB shell version: 2.4.6\n",
        "connecting to: dayton\n",
        "bye\n"
       ]
      }
     ],
     "prompt_number": 31
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "%%script mongo dayton\n",
      "db.members.find()"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "MongoDB shell version: 2.4.6\n",
        "connecting to: dayton\n",
        "{ \"_id\" : ObjectId(\"528418c9b8fa004981577216\"), \"name\" : \"Ken\", \"language\" : \"Perl\" }\n",
        "{ \"_id\" : ObjectId(\"52841a91b57f8e18a0ac79a7\"), \"cm\" : 180 }\n",
        "{ \"_id\" : ObjectId(\"52841a211de978769fc0ce4c\"), \"cm\" : 180, \"language\" : [  \"PHP\",  \"Perl\" ], \"name\" : \"Grant\" }\n",
        "bye\n"
       ]
      }
     ],
     "prompt_number": 32
    },
    {
     "cell_type": "heading",
     "level": 3,
     "metadata": {},
     "source": [
      "need the `$set` modifier"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "%%script mongo dayton\n",
      "db.members.update({name: \"Ken\"}, {$set: {cm: 185}});\n",
      "db.members.find({name: \"Ken\"});"
     ],
     "language": "python",
     "metadata": {},
     "outputs": []
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "%%script mongo dayton\n",
      "db.members.remove({name: null})\n",
      "db.members.find()"
     ],
     "language": "python",
     "metadata": {},
     "outputs": []
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "From your language"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "import pymongo\n",
      "client = pymongo.Connection()"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 33
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "db = client.dayton\n",
      "db"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 34,
       "text": [
        "Database(Connection('localhost', 27017), u'dayton')"
       ]
      }
     ],
     "prompt_number": 34
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "db.members.find()"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 35,
       "text": [
        "<pymongo.cursor.Cursor at 0x32a2a50>"
       ]
      }
     ],
     "prompt_number": 35
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "for member in db.members.find():\n",
      "    print member"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "{u'_id': ObjectId('528418c9b8fa004981577216'), u'name': u'Ken', u'language': u'Perl'}\n",
        "{u'_id': ObjectId('52841a91b57f8e18a0ac79a7'), u'cm': 180.0}\n",
        "{u'_id': ObjectId('52841a211de978769fc0ce4c'), u'language': [u'PHP', u'Perl'], u'cm': 180.0, u'name': u'Grant'}\n"
       ]
      }
     ],
     "prompt_number": 36
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "dave = {'name': 'Dave', 'language': 'Python'}\n",
      "db.members.insert(dave)\n",
      "list(db.members.find())"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 37,
       "text": [
        "[{u'_id': ObjectId('528418c9b8fa004981577216'),\n",
        "  u'language': u'Perl',\n",
        "  u'name': u'Ken'},\n",
        " {u'_id': ObjectId('52841a91b57f8e18a0ac79a7'), u'cm': 180.0},\n",
        " {u'_id': ObjectId('52841a211de978769fc0ce4c'),\n",
        "  u'cm': 180.0,\n",
        "  u'language': [u'PHP', u'Perl'],\n",
        "  u'name': u'Grant'},\n",
        " {u'_id': ObjectId('52842205417f34189f8d7f61'),\n",
        "  u'language': u'Python',\n",
        "  u'name': u'Dave'}]"
       ]
      }
     ],
     "prompt_number": 37
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [],
     "language": "python",
     "metadata": {},
     "outputs": []
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "no joins"
     ]
    },
    {
     "cell_type": "heading",
     "level": 3,
     "metadata": {},
     "source": [
      "two-query method"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "%%script mongo dayton\n",
      "db.languages.insert({_id: \"Ruby\", creator: \"Matz\"});\n",
      "db.languages.insert({_id: \"Python\", creator: \"Guido\"});\n",
      "db.languages.insert({_id: \"Perl\", creator: \"Larry\"});\n",
      "db.languages.find()"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "MongoDB shell version: 2.4.6\n",
        "connecting to: dayton\n",
        "{ \"_id\" : \"Ruby\", \"creator\" : \"Matz\" }\n",
        "{ \"_id\" : \"Python\", \"creator\" : \"Guido\" }\n",
        "{ \"_id\" : \"Perl\", \"creator\" : \"Larry\" }\n",
        "bye\n"
       ]
      }
     ],
     "prompt_number": 38
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "for member in db.members.find():\n",
      "    print member.get('name')\n",
      "    if 'language' in member:\n",
      "        print member['language']\n",
      "        lang = db.languages.find_one({'_id': member['language']})\n",
      "        if lang:\n",
      "            print lang['creator']\n",
      "    print"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "Ken\n",
        "Perl\n",
        "Larry\n",
        "\n",
        "None\n",
        "\n",
        "Grant\n",
        "[u'PHP', u'Perl']\n",
        "\n",
        "Dave\n",
        "Python\n",
        "Guido\n",
        "\n"
       ]
      }
     ],
     "prompt_number": 39
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "nesting"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "%%script mongo dayton\n",
      "db.members.update({language: \"Python\"}, {$set: {language: {name: \"Python\", creator: \"Guido\"}}})\n",
      "db.members.update({language: \"Ruby\"}, {$set: {language: {name: \"Ruby\", creator: \"Matz\"}}})\n",
      "db.members.update({language: \"Perl\"}, {$set: {language: {name: \"Perl\", creator: \"Larry\"}}})\n",
      "db.members.find()"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "MongoDB shell version: 2.4.6\n",
        "connecting to: dayton\n",
        "{ \"_id\" : ObjectId(\"52841a91b57f8e18a0ac79a7\"), \"cm\" : 180 }\n",
        "{ \"_id\" : ObjectId(\"52841a211de978769fc0ce4c\"), \"cm\" : 180, \"language\" : [  \"PHP\",  \"Perl\" ], \"name\" : \"Grant\" }\n",
        "{ \"_id\" : ObjectId(\"52842205417f34189f8d7f61\"), \"language\" : { \"name\" : \"Python\", \"creator\" : \"Guido\" }, \"name\" : \"Dave\" }\n",
        "{ \"_id\" : ObjectId(\"528418c9b8fa004981577216\"), \"language\" : { \"name\" : \"Perl\", \"creator\" : \"Larry\" }, \"name\" : \"Ken\" }\n",
        "bye\n"
       ]
      }
     ],
     "prompt_number": 40
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "for member in db.members.find():\n",
      "    if 'name' in member:\n",
      "        print member['name']\n",
      "        if 'language' in member:\n",
      "            if not isinstance(member['language'], list):\n",
      "                print member['language']['creator']"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "Grant\n",
        "Dave\n",
        "Guido\n",
        "Ken\n",
        "Larry\n"
       ]
      }
     ],
     "prompt_number": 43
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "- 16 MB record limit\n",
      "- redundant storage"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "%%script mongo dayton\n",
      "db.dropDatabase()"
     ],
     "language": "python",
     "metadata": {},
     "outputs": []
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [],
     "language": "python",
     "metadata": {},
     "outputs": []
    }
   ],
   "metadata": {}
  }
 ]
}