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| 1 | +# Attachment Size Audit |
| 2 | + |
| 3 | +A ServiceNow background script that analyzes your instance's attachment storage and identifies which tables consume the most space and locate oversized files. |
| 4 | + |
| 5 | +## Overview |
| 6 | + |
| 7 | +This read-only script scans all attachments in your instance and provides: |
| 8 | +- Total storage used across all attachments |
| 9 | +- Storage breakdown by source table (kb_knowledge, sc_task, incident, etc.) |
| 10 | +- List of the 25 largest individual attachments |
| 11 | + |
| 12 | +The script does not modify or delete any data—it only reads and reports findings. |
| 13 | + |
| 14 | +## How It Works |
| 15 | + |
| 16 | +The script runs through three main steps: |
| 17 | + |
| 18 | +1. **Calculate Total Storage** - Sums all attachment sizes to give your total storage footprint |
| 19 | +2. **Break Down by Table** - Groups attachments by source table to identify which applications consume the most storage |
| 20 | +3. **Find Largest Files** - Identifies individual attachments larger than your threshold and lists them in descending order |
| 21 | + |
| 22 | +## Configuration |
| 23 | + |
| 24 | +Before running, adjust these variables at the top of the script: |
| 25 | + |
| 26 | +- `TOP_N_ATTACHMENTS` (default: 25) - Number of largest files to display |
| 27 | +- `MIN_SIZE_MB` (default: 5) - Only show attachments larger than this size in MB |
| 28 | +- `USE_COMPRESSED_SIZE` (default: true) - Use actual disk size (true) or logical file size (false) |
| 29 | + |
| 30 | +## Prerequisites |
| 31 | + |
| 32 | +- Admin role to execute background scripts |
| 33 | +- Global scope (or scoped app with sys_attachment visibility) |
| 34 | +- Read access to sys_attachment table |
| 35 | +- Access to System Logs to view results |
| 36 | + |
| 37 | +## How to Run |
| 38 | + |
| 39 | +1. Navigate to **System Definition → Scripts - Background** |
| 40 | +2. Click **New** and paste the script |
| 41 | +3. Optionally adjust configuration variables |
| 42 | +4. Click **Execute** |
| 43 | +5. View results in **System Diagnostics → System Log** (search for "Attachment Size Audit") |
| 44 | + |
| 45 | +## Sample Output |
| 46 | + |
| 47 | +``` |
| 48 | +=== Attachment Size Audit Started === |
| 49 | +Using size field: SIZE_COMPRESSED |
| 50 | +
|
| 51 | +Total Attachment Storage: 415.28 MB |
| 52 | +
|
| 53 | +=== Storage Usage by Table (Descending) === |
| 54 | +invisible.sys_store_app : 175.29 MB |
| 55 | +sys_upgrade_manifest : 49.39 MB |
| 56 | +ZZ_YYsn_wn_media : 33.50 MB |
| 57 | +ZZ_YYdb_image : 28.99 MB |
| 58 | +sys_sg_mobile_builder_config : 25.36 MB |
| 59 | +ZZ_YYhelp_content : 21.00 MB |
| 60 | +incident : 1.18 MB |
| 61 | +kb_knowledge : 75.54 KB |
| 62 | +
|
| 63 | +=== Top 25 Largest Attachments (>5 MB) === |
| 64 | +[ 68.47 MB ] sncencZZYY.fd254d9443a161100967247e6bb8f200_3_1_3.zip | Table: invisible.sys_store_app | Record: fd254d9443a161100967247e6bb8f200 |
| 65 | +[ 24.72 MB ] upgrade_manifest.csv | Table: sys_upgrade_manifest | Record: d5ee366b47203210ca05a464116d4328 |
| 66 | +[ 24.66 MB ] upgrade_manifest.csv | Table: sys_upgrade_manifest | Record: 9ee610ffe17a22108bb2327e625886d0 |
| 67 | +[ 17.77 MB ] image | Table: ZZ_YYhelp_content | Record: 19d642e347203210ca05a464116d4369 |
| 68 | +[ 11.63 MB ] sncencZZYY.a77e3ede4df92010f87774ecf02d44f3_28_1_1.zip | Table: invisible.sys_store_app | Record: a77e3ede4df92010f87774ecf02d44f3 |
| 69 | +
|
| 70 | +=== Attachment Size Audit Complete === |
| 71 | +``` |
| 72 | + |
| 73 | +## Use Cases |
| 74 | + |
| 75 | +- **Storage Planning** - Understand current attachment storage and plan for capacity growth |
| 76 | +- **Cost Optimization** - Identify storage hotspots for cloud instances to reduce costs |
| 77 | +- **Performance Issues** - Find large attachment tables that may be slowing queries |
| 78 | +- **Cleanup Strategy** - Identify which tables and files should be targeted for archival or deletion |
| 79 | +- **Pre-Upgrade Preparation** - Run before major upgrades to identify optimization opportunities |
| 80 | + |
| 81 | +## Future Enhancement Opportunities |
| 82 | + |
| 83 | +- **Generate Cleanup Script** - Create a companion script to delete old or orphaned attachments with DRY_RUN mode |
| 84 | +- **Orphaned Attachment Detection** - Identify attachments where parent records have been deleted |
| 85 | +- **File Age Analysis** - Track attachments older than 30/90/365 days to support retention policies |
| 86 | +- **File Type Breakdown** - Categorize attachments by extension (PDF, DOCX, MP4, etc.) |
| 87 | +- **Email Notifications** - Send automated summaries to storage admins with key metrics |
| 88 | +- **Dashboard Widget** - Create PA widget to visualize storage trends over time |
| 89 | +- **Scheduled Reporting** - Set up as scheduled job to track growth monthly |
| 90 | +- **Duplicate Detection** - Find duplicate attachments on same records for cleanup opportunities |
| 91 | + |
| 92 | +## Safety & Performance |
| 93 | + |
| 94 | +- **Read-only operation** - No data is modified or deleted |
| 95 | +- **No infinite loops** - Explicit limits on record processing |
| 96 | +- **Timeout prevention** - Efficient aggregate queries for large datasets |
| 97 | +- **Sub Pro Testing** - Test in sub-production environments first |
| 98 | + |
| 99 | + |
| 100 | +## Authors |
| 101 | +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> ) |
| 102 | + |
| 103 | +## Version History: |
| 104 | +* 0.1 |
| 105 | + * Initial Release |
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