AWS documentdb documentation change

Service: documentdb · 2026-03-31 · Documentation low

File: documentdb/latest/developerguide/ln.md

Summary

Added new documentation page for the $ln operator in Amazon DocumentDB, including description, parameters, MongoDB shell example, and code examples in Node.js and Python.

Security assessment

The change adds documentation for a new mathematical operator ($ln) and includes example connection strings with security parameters (tls=true, tlsCAFile=global-bundle.pem). While it demonstrates secure connection practices, there is no evidence this addresses a specific security vulnerability or incident.

Diff

diff --git a/documentdb/latest/developerguide/ln.md b/documentdb/latest/developerguide/ln.md
index 8b1378917..d6b2e1b21 100644
--- a//documentdb/latest/developerguide/ln.md
+++ b//documentdb/latest/developerguide/ln.md
@@ -0,0 +1 @@
+[](/pdfs/documentdb/latest/developerguide/developerguide.pdf#ln "Open PDF")
@@ -1,0 +3,124 @@
+[Documentation](/index.html)[Amazon DocumentDB](/documentdb/index.html)[Developer Guide](what-is.html)
+
+Example (MongoDB Shell)Code examples
+
+# $ln
+
+New from version 4.0.
+
+The `$ln` operator in Amazon DocumentDB calculates the natural logarithm (base e) of a specified number. It returns the logarithm of the number to the base e.
+
+**Parameters**
+
+  * `expression`: The number for which the natural logarithm will be calculated.
+
+
+
+
+## Example (MongoDB Shell)
+
+The following example demonstrates the usage of the `$log` operator to calculate the natural logarithm of a number.
+
+**Create sample documents**
+    
+    
+    db.numbers.insertMany([
+      { _id: 1, value: 10 },
+      { _id: 2, value: 100 },
+      { _id: 3, value: 1000 }
+    ]);
+
+**Query example**
+    
+    
+    db.numbers.aggregate([
+      { $project: {
+        _id: 1,
+        naturalLog: { $ln: "$value" }
+      }}
+    ]);
+
+**Output**
+    
+    
+    [
+      { "_id" : 1, "naturalLog" : 2.302585092994046 },
+      { "_id" : 2, "naturalLog" : 4.605170185988092 },
+      { "_id" : 3, "naturalLog" : 6.907755278982137 }
+    ]
+
+## Code examples
+
+To view a code example for using the `$ln` command, choose the tab for the language that you want to use:
+
+Node.js
+    
+    
+    
+    const { MongoClient } = require('mongodb');
+    
+    async function example() {
+      const client = await MongoClient.connect('mongodb://<username>:<password>@<cluster-endpoint>:27017/?tls=true&tlsCAFile=global-bundle.pem&replicaSet=rs0&readPreference=secondaryPreferred&retryWrites=false');
+    
+      const db = client.db('test');
+      const collection = db.collection('numbers');
+    
+      const result = await collection.aggregate([
+        { $project: {
+          _id: 1,
+          naturalLog: { $ln: "$value" }
+        }}
+      ]).toArray();
+    
+      console.log(result);
+      client.close();
+    }
+    
+    example();
+
+Python
+    
+    
+    
+    from pymongo import MongoClient
+    
+    def example():
+      
+        client = MongoClient('mongodb://<username>:<password>@<cluster-endpoint>:27017/?tls=true&tlsCAFile=global-bundle.pem&replicaSet=rs0&readPreference=secondaryPreferred&retryWrites=false')
+    
+        db = client.test
+        collection = db.numbers
+    
+        result = list(collection.aggregate([
+            { "$project": {
+                "_id": 1,
+                "naturalLog": { "$ln": "$value" }
+            }}
+        ]))
+    
+        print(result)
+        client.close()
+    
+    example()
+
+![Warning](https://d1ge0kk1l5kms0.cloudfront.net/images/G/01/webservices/console/warning.png) **Javascript is disabled or is unavailable in your browser.**
+
+To use the Amazon Web Services Documentation, Javascript must be enabled. Please refer to your browser's Help pages for instructions.
+
+[Document Conventions](/general/latest/gr/docconventions.html)
+
+$literal
+
+$log
+
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+
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+
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+
+Did this page help you? - No
+
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+
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