Dropping ACID with MongoDB

Application Perl Database Apache Linux

Application Perl Apache Windows

Application The world's most popular open source database Perl Apache Linux

Application Perl Apache Linux The world's most advanced open source database

databases contain tables contain rows

schema databases contain tables contain rows

schema databases contain tables contain rows joins

$conn = MongoDB::Connection->new;

$conn = MongoDB::Connection->new; $db = $conn->foo;

$conn = MongoDB::Connection->new; $db = $conn->foo; NO ADMINISTRATION

$conn = MongoDB::Connection->new; $db = $conn->foo; $table = $db->bar;

server databases contain tables

server databases collections contain tables

server databases collections contain tables contain rows

server databases collections contain tables documents contain rows

server schema databases collections contain tables documents contain rows

server schema databases collections contain tables documents contain rows joins

server databases contain collections contain documents

$conn = MongoDB::Connection->new; $db = $conn->foo; $collection = $db->bar;

$conn = MongoDB::Connection->new; $db = $conn->foo; $collection = $db->bar; NO ADMINISTRATION

$conn = MongoDB::Connection->new; $db = $conn->foo $collection = $db->bar; $doc = {"name" => "kristina", "contact info" => { "twitter" => "@kchodorow", "email" => "kristina@10gen.com" }, "friends" => 400232, "pic" => file_str, "member since" => DateTime->now};

$conn = MongoDB::Connection->new; $db = $conn->foo $collection = $db->bar; $doc = {"name" => "kristina", "contact info" => { "twitter" => "@kchodorow", "email" => "kristina@10gen.com" }, "friends" => 400232, "pic" => file_str, "member since" => DateTime->now}; $collection->insert($doc);

mongo is type-sensitive and type-rich

MongoDB::MaxKey,[object Object]

$collection->find_one({ "name" => "kristina"}); $collection->find_one({ "contact.twitter" => "@kchodorow"});

$collection->find_one({ "name" => "kristina"}); $collection->find_one({ "contact.twitter" => "@kchodorow"}); $collection->find({ "member since" => { '$gt' => $yesterday, '$lt' => $now }});

$collection->find_one({ "name" => "kristina"}); $collection->find_one({ "contact.twitter" => "@kchodorow"}); $collection->find({ "member since" => { '$gt' => $yesterday, '$lt' => $now }})->sort({"friends" => 1});

$collection->find_one({ "name" => "kristina"}); $collection->find_one({ "contact.twitter" => "@kchodorow"}); $collection->find({ "member since" => { '$gt' => $yesterday, '$lt' => $now }})->sort({"friends" => 1})->limit(10);

$collection->find_one({ "name" => "kristina"}); $collection->find_one({ "contact.twitter" => "@kchodorow"}); $collection->find({ "member since" => { '$gt' => $yesterday, '$lt' => $now }})->sort({"friends" => 1})->limit(10) ->skip(100);

$collection->find_one({ "name" => "kristina"}); $collection->find_one({ "contact.twitter" => "@kchodorow"}); $cursor = $collection->find({ "member since" => { '$gt' => $yesterday, '$lt' => $now }})->sort({"friends" => 1})->limit(10) ->skip(100);

while (my $doc = $cursor->next) { # ... } my @results = $cursor->all;

$gt $lte $ne $mod $exists $type ...

$collection->update( {"name" => "kristina"},

$collection->update( {"name" => "kristina"}, {'$set' =>

$collection->update( {"name" => "kristina"}, {'$set' => {"contact.website" => "snailinaturtleneck.com" }});

updates are... ,[object Object]

able to create and delete fields

able to create documents,[object Object]

$set $inc $push $pop $pull ...

Or define your own! ":gte" "=gte" "?gte"

Or define your own! " gte" " ♕ gte"

Or define your own! " gte" " ♕ gte" "xgte"

I suddenly have a deep love for stored procedures

I suddenly have a deep love for stored procedures now with stored procedures!

$db->system->js->insert({ "_id" => "x", "value" => 3}); $db->system->js->insert({ "_id" => "y", "value" => 4}); $db->eval("return x+y");

my $log = <<<LOG function(msg, level) { var date = "[" + new Date() + "] "; varlvl = level ? level+" " : ""; print(date + lvl + msg); } LOG; $db->system->js->insert({ "_id" => "log", "value" => $log});

$db->eval("log('all your base are belong to us', 'FATAL');");

$db->eval("log('all your base are belong to us', 'FATAL');"); [Fri May 19 18:34:57] FATAL all your base are belong to us

$metadata = { "_id" => " " "date" => DateTime->now "downloads" => 0, "user" => $userId, "filename" => "rickroll.flv" } J

$grid = $db->get_gridfs; $grid->put($fh, $metadata);

$grid = $db->get_gridfs; $grid->put($fh, $metadata); $file = $grid->find_one({ "filename" => qr/rickroll/i });

$grid = $db->get_gridfs; $grid->put($fh, $metadata); $file = $grid->find_one({ "filename" => qr/rickroll/i }); $file->print($fh2);

Millions of files per directory

Better disk locality,[object Object]

$coll->insert({location => (-40, 78)});

$coll->insert({location => (-40, 78)}); $coll->find({location => { '$near' => (-40, 77)}})

$coll->insert({location => (-40, 78)}); $coll->find({location => { '$near' => (-40, 77)}})->limit(10)

are you practicing safe data storage?

Insert this. Okay, got it. Phew, my data's safe.

Write this to disk I know better than he does, I'll just let this sit in a buffer for a while. All over it!

? I have no idea what you're talking about.

trust no one! ...trust a bunch of ones. Mostly.

prod1.example.com prod2.example.com

prod2.example.com prod1.example.com

prod1.example.com ? prod2.example.com

? prod1.example.com prod2.example.com

primary secondary secondary passive

make sure two slaves have this

$conn->w(3); $collection->insert({"x" => 1}, {"safe" => 1});

sometimes read-only sometimes inconsistent

Dropping ACID with MongoDB

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