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+# Attachment Size Audit
+
+A ServiceNow background script that analyzes your instance's attachment storage and identifies which tables consume the most space and locate oversized files.
+
+## Overview
+
+This read-only script scans all attachments in your instance and provides:
+- Total storage used across all attachments
+- Storage breakdown by source table (kb_knowledge, sc_task, incident, etc.)
+- List of the 25 largest individual attachments
+
+The script does not modify or delete any data—it only reads and reports findings.
+
+## How It Works
+
+The script runs through three main steps:
+
+1. **Calculate Total Storage** - Sums all attachment sizes to give your total storage footprint
+2. **Break Down by Table** - Groups attachments by source table to identify which applications consume the most storage
+3. **Find Largest Files** - Identifies individual attachments larger than your threshold and lists them in descending order
+
+## Configuration
+
+Before running, adjust these variables at the top of the script:
+
+- `TOP_N_ATTACHMENTS` (default: 25) - Number of largest files to display
+- `MIN_SIZE_MB` (default: 5) - Only show attachments larger than this size in MB
+- `USE_COMPRESSED_SIZE` (default: true) - Use actual disk size (true) or logical file size (false)
+
+## Prerequisites
+
+- Admin role to execute background scripts
+- Global scope (or scoped app with sys_attachment visibility)
+- Read access to sys_attachment table
+- Access to System Logs to view results
+
+## How to Run
+
+1. Navigate to **System Definition → Scripts - Background**
+2. Click **New** and paste the script
+3. Optionally adjust configuration variables
+4. Click **Execute**
+5. View results in **System Diagnostics → System Log** (search for "Attachment Size Audit")
+
+## Sample Output
+
+```
+=== Attachment Size Audit Started ===
+Using size field: SIZE_COMPRESSED
+
+Total Attachment Storage: 415.28 MB
+
+=== Storage Usage by Table (Descending) ===
+invisible.sys_store_app           : 175.29 MB
+sys_upgrade_manifest              : 49.39 MB
+ZZ_YYsn_wn_media                  : 33.50 MB
+ZZ_YYdb_image                     : 28.99 MB
+sys_sg_mobile_builder_config      : 25.36 MB
+ZZ_YYhelp_content                 : 21.00 MB
+incident                          : 1.18 MB
+kb_knowledge                      : 75.54 KB
+
+=== Top 25 Largest Attachments (>5 MB) ===
+[ 68.47 MB ] sncencZZYY.fd254d9443a161100967247e6bb8f200_3_1_3.zip | Table: invisible.sys_store_app | Record: fd254d9443a161100967247e6bb8f200
+[ 24.72 MB ] upgrade_manifest.csv | Table: sys_upgrade_manifest | Record: d5ee366b47203210ca05a464116d4328
+[ 24.66 MB ] upgrade_manifest.csv | Table: sys_upgrade_manifest | Record: 9ee610ffe17a22108bb2327e625886d0
+[ 17.77 MB ] image | Table: ZZ_YYhelp_content | Record: 19d642e347203210ca05a464116d4369
+[ 11.63 MB ] sncencZZYY.a77e3ede4df92010f87774ecf02d44f3_28_1_1.zip | Table: invisible.sys_store_app | Record: a77e3ede4df92010f87774ecf02d44f3
+
+=== Attachment Size Audit Complete ===
+```
+
+## Use Cases
+
+- **Storage Planning** - Understand current attachment storage and plan for capacity growth
+- **Cost Optimization** - Identify storage hotspots for cloud instances to reduce costs
+- **Performance Issues** - Find large attachment tables that may be slowing queries
+- **Cleanup Strategy** - Identify which tables and files should be targeted for archival or deletion
+- **Pre-Upgrade Preparation** - Run before major upgrades to identify optimization opportunities
+
+## Future Enhancement Opportunities
+
+- **Generate Cleanup Script** - Create a companion script to delete old or orphaned attachments with DRY_RUN mode
+- **Orphaned Attachment Detection** - Identify attachments where parent records have been deleted
+- **File Age Analysis** - Track attachments older than 30/90/365 days to support retention policies
+- **File Type Breakdown** - Categorize attachments by extension (PDF, DOCX, MP4, etc.)
+- **Email Notifications** - Send automated summaries to storage admins with key metrics
+- **Dashboard Widget** - Create PA widget to visualize storage trends over time
+- **Scheduled Reporting** - Set up as scheduled job to track growth monthly
+- **Duplicate Detection** - Find duplicate attachments on same records for cleanup opportunities
+
+## Safety & Performance
+
+- **Read-only operation** - No data is modified or deleted
+- **No infinite loops** - Explicit limits on record processing
+- **Timeout prevention** - Efficient aggregate queries for large datasets
+- **Sub Pro Testing** - Test in sub-production environments first
+
+
+## Authors
+Masthan Sharif Shaik ( <a href="https://www.linkedin.com/in/nowsharif/" target="_blank">LinkedIn</a> ,  <a href="https://www.servicenow.com/community/user/viewprofilepage/user-id/668622" target="_blank">SN Community</a> )
+
+## Version History:
+* 0.1
+    * Initial Release
diff --git a/Server-Side Components/Background Scripts/Attachment Size Audit/attachmentSizeAudit.js b/Server-Side Components/Background Scripts/Attachment Size Audit/attachmentSizeAudit.js
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+// Background Script: Attachment Size Audit
+// Purpose: Analyzes your ServiceNow instance's attachment storage to identify which tables and individual files consume the most space. 
+//Helps you understand storage usage patterns, locate oversized files, and plan cleanup or archival strategies. 
+//Provides a read-only audit report without modifying any data.
+//
+// Author: Masthan Sharif Shaik
+// Date: October 2025
+// Tested on: Zurich, Yokohama
+//
+// IMPORTANT: Test in non-production environment first
+
+(function attachmentSizeAudit() {
+
+    // ================= CONFIGURATION =================
+    var TOP_N_ATTACHMENTS = 25;        // Number of largest attachments to list
+    var MIN_SIZE_MB = 5;              // Only list attachments larger than this (MB)
+    var USE_COMPRESSED_SIZE = true;   // true = use size_compressed, false = use size_bytes
+    // =================================================
+
+    var sizeField = USE_COMPRESSED_SIZE ? "size_compressed" : "size_bytes";
+    var totalSizeBytes = 0;
+
+    gs.info("=== Attachment Size Audit Started ===");
+    gs.info("Using size field: " + sizeField.toUpperCase());
+
+    // ----------------- TOTAL SIZE --------------------
+    var totalAgg = new GlideAggregate("sys_attachment");
+    totalAgg.addAggregate("SUM", sizeField);
+    totalAgg.query();
+    if (totalAgg.next()) {
+        totalSizeBytes = totalAgg.getAggregate("SUM", sizeField);
+    }
+
+    gs.info("Total Attachment Storage: " +
+        formatBytes(totalSizeBytes));
+
+    // ------------- SIZE PER TABLE (AGGREGATED) --------------
+    gs.info("\n=== Storage Usage by Table (Descending) ===");
+
+    var tableAgg = new GlideAggregate("sys_attachment");
+    tableAgg.groupBy("table_name");
+    tableAgg.addAggregate("SUM", sizeField);
+    tableAgg.orderByAggregate("SUM", sizeField);
+    tableAgg.query();
+
+    while (tableAgg.next()) {
+        var table = tableAgg.getValue("table_name") || "<no table>";
+        var tableSize = tableAgg.getAggregate("SUM", sizeField);
+        gs.info(table.padEnd(40) + " : " + formatBytes(tableSize));
+    }
+
+    // --------------- TOP N BIGGEST ATTACHMENTS ---------------
+    gs.info("\n=== Top " + TOP_N_ATTACHMENTS + " Largest Attachments (>" + MIN_SIZE_MB + " MB) ===");
+
+    var attGR = new GlideRecord("sys_attachment");
+    attGR.addQuery(sizeField, ">", MIN_SIZE_MB * 1024 * 1024); 
+    attGR.orderByDesc(sizeField);
+    attGR.setLimit(TOP_N_ATTACHMENTS);
+    attGR.query();
+
+    while (attGR.next()) {
+        gs.info(
+            "[ " + formatBytes(attGR[sizeField]) + " ] " +
+            attGR.getValue("file_name") +
+            "  |  Table: " + attGR.getValue("table_name") +
+            "  |  Record: " + attGR.getValue("table_sys_id")
+        );
+    }
+
+    gs.info("\n=== Attachment Size Audit Complete ===");
+
+    // ------------- FORMATTER ----------------
+    function formatBytes(bytes) {
+        bytes = parseInt(bytes, 10) || 0;
+        if (bytes < 1024) return bytes + " B";
+        var i = Math.floor(Math.log(bytes) / Math.log(1024));
+        var sizes = ["B", "KB", "MB", "GB", "TB"];
+        var value = (bytes / Math.pow(1024, i)).toFixed(2);
+        return value + " " + sizes[i];
+    }
+
+})();