How to programatically enable sharding for a database and then shard the collection using node.js mongodb driver? -

-

मेरे पास निम्न नोडजे स्क्रिप्ट है जो वर्तमान में कुछ परीक्षण डेटाबेस बनाता है और फिर एक संग्रह बनाता है और संग्रह में एक नमूना प्रविष्टि सम्मिलित करता है । अब मैं डेटाबेस के लिए कंजिंग को सक्षम करना चाहूंगा और फिर हैशड id क्षेत्र के आधार पर संग्रह को ढंक कर दूंगा। मैं ऐसा कैसे कर सकता हूं?

कोड बिंदु में होस्ट और बंदरगाह जहां मौंगोस चल रहा है। 

  Var मोंगो क्लाइंट = आवश्यक ('मोंगोड')। मोंगो क्लाइंट; Var name = "sampledb"; फ़ंक्शन प्रारंभ () {for (var i = 4; i & lt; 20; ++ i) {var dbname = name + i; MongoClient.connect ("mongodb: //" + host + ":" + port + "/" + dbname, फ़ंक्शन (गलती, डीबी) {if (err) {console.log ("db से कनेक्ट करने में त्रुटि"); प्रक्रिया .exit (0);} db.createCollection ("संदेश", फ़ंक्शन (err_, result_) {if (err_) {console.log ("संग्रह बनाने में त्रुटि"); process.exit (0);} db.collection ("संदेश")। ({"Id": "& lt; random id & gt;"}, {w: 0}, फ़ंक्शन (गलती, परिणाम) {if (err) {console.log ("दस्तावेज़ सम्मिलित नहीं किया जा सकता" );} Else {console.log ("सफलतापूर्वक डाला गया दस्तावेज़");}}); // अब बनाए गए संग्रह को ढंक दिया गया}};}); } }  प्रारंभ();

मुझे अपने प्रश्न के लिए उचित दस्तावेज नहीं मिल सका, कोई कृपया मेरी मदद कर सकता है ... धन्यवाद।


Comments

Post a Comment

Popular posts from this blog

java - Can't add JTree to JPanel of a JInternalFrame -

-
Image
There are two panels in my JInternalframe. I want to add TopPanel to Jtree to nominate another. But I can not add Jaitari to the top of the panel. Please help me in this piece of code: DefaultMutableTreeNode root = new DefaultMutableTreeNode ("deck"); DefaultMutableTreeNode Item Clubs = New DefaultMutableTreeNode ("Club"); AddAllCard (itemClubs); Root.add (itemClubs); DefaultMutableTreeNode item = New DefaultMutableTreeNode ("Diamonds"); AddAllCard (itemDiamonds); Root.add (itemDiamonds); DefaultMutableTreeNode Itemspads = New DefaultMutableTreeNode ("Spades"); AddAllCard (itemSpades); Root.add (itemSpades); DefaultMutableTreeNode item increases = new DefaultMutableTreeNode ("heart"); AddAllCard (itemHearts); Root.add (itemHearts); Default Trimodel Tree Model = New DefaultTreeModel (Route); Tree = new jetty (tree modal); ScrollPane = new JScrollPane (tree); // scrollPane.setViewportView (tree); . ScrollPane.getViewport () add (tr...
Read more

python - Calculate STD manually using Groupby Pandas DataFrame -

-
Image
I was trying to write a solution, which is a different and a manual for calculating a mean and STD The way. I have created a = ["Apple", "Banana", "Cherry", "Apple"] B = [3,4,7,3] C = [5,4,1,4] D = [7,8,3,7] Pd DF = PD to import pandals DataFrame (index = class (4), column = list ("ABCD")) DF ["A"] = A DF ["B"] = BDF ["C"] = C DF ["D"] = D Again, I made a list of A duplication. Then I went through the group all the time of the objects and calculated the solution. import as np l = list (set (df.A)) df.groupby ('A', As_index = False) listMean = [0] * len (df.C) ListSTD = [0] * L in the LAN (df.C) X: s = np.mean (df [df ['A'] == x] for C =.) = Z = [index for index, enumerate In the object (df ['a']. Value] x == item i for z: listMean [i] = s in: s = np.std (df [df ['a'] == X] .cvalues) z = index for index, enumerate item (df ['a']. Value) if x ==...
Read more

java - @PluginTarget(Node.class) not registering as neo4j plugin -

-
Simple class below will not show as a plugin package com.danmacias neoneoteplugin ; Import java.util.ArrayList; Import java.util.list; Import org.neo4j.graphdb. *; Import org.neo4j.server.plugins *; Import org.neo4j.graphalgo *; // import org.neo4j.tooling.GlobalGraphOperations; @ Description (expansion of Neo4j server to achieve all nodes or relationships) Public class GetPaths expanded the server plugin {@ name ("breadth_first_paths") @ Description ("first wide travel traversal of specific node"). @plugin target (node ​​class) public shaky & lt; Path & gt; GetPaths (@ Source Node Graphidi) {ArrayList & lt; Path & gt; Path = new arreelist & lt; & Gt; (); Return path; }} curl return {"extension": {"GetAll": {"get_all_nodes": "http: // localhost: 7474 / db / ext / GetAll / graphdb / get_all_nodes "} ...}, But when I Node.class both conditions GraphDatabaseService I change with Class ,...
Read more