Knowledge Studio enforces capacity limits and format constraints across business spaces, knowledge bases, file uploads, chunking, retrieval services, and other components. The following sections detail these limits by workflow stage. If you exceed any limit, you can submit a support ticket to request a quota increase.
Spaces and Knowledge Bases
A business space is the top-level container for resource isolation. Each space can host multiple knowledge bases.
| Item | Limit | Notes |
|---|
| Business spaces per account | 30 | The primary account’s space is marked as default |
| Knowledge bases per business space | 50 | Quota increase available via support ticket |
| Knowledge base name length | 1–20 characters | Must be unique within the business space |
| Knowledge base description length | 200 characters | — |
| Documents per knowledge base | 100,000 | Consider splitting the knowledge base if exceeding this |
File Uploads
Knowledge bases support various file types—including documents, spreadsheets, images, audio, and video—each subject to distinct format and size constraints.
Documents and Text
| Type | Format | Per-file limit |
|---|
| Documents | .doc / .docx / .ppt / .pptx / .pdf | 150 MB or 1,000 pages |
| Plain text | .md / .txt / .html | Recommended ≤ 10 MB |
| Spreadsheets | .xls / .xlsx | Recommended ≤ 10 MB and ≤ 100,000 rows |
PDFs undergo direct text extraction; scanned PDFs are automatically processed with OCR. Spreadsheets are chunked row-by-row, with the first row used as column headers. Markdown files are split by heading level; HTML files have <script> and <style> tags automatically stripped.
Images
| Item | Limit |
|---|
| Formats | .png / .jpg / .jpeg / .bmp / .gif |
| Single image size | ≤ 20 MB |
| Dimension constraints | Shortest side > 15 px; longest side < 8192 px; aspect ratio < 50 |
Audio and Video
| Item | Limit |
|---|
| Audio formats | .aac / .amr / .flac / .flv / .m4a / .mp3 / .mpeg / .ogg / .opus / .wav / .webm / .wma |
| Video formats | .mp4 / .mkv / .avi / .mov / .wmv |
| Single file size | ≤ 2 GB |
| Max import count per batch | 50 (combined total of audio and video files) |
General Upload Limits
| Item | Limit |
|---|
| Files per upload | 50 |
Chunking
Chunks serve as the fundamental retrieval units in a knowledge base. Chunking strategies and segment lengths are configured during data import.
| Item | Range | Default |
|---|
| Maximum segment length | 10–6000 tokens | 600 tokens |
| Chunk content length | 0–6000 characters | Applies when manually adding chunks |
| Chunk title length | 0–50 characters | Used for display in chunk lists |
Chunking method (e.g., intelligent splitting, fixed-length, page-based, heading-based, regex-based, or symbol-based) and maximum segment length are configured during data import and cannot be modified after creation. Knowledge Retrieval and Q&A Services
Retrieval and Q&A services constitute the external API endpoints for knowledge bases. The following limits are set when creating a service.
| Item | Range | Default |
|---|
| Knowledge bases per service | Up to 15 | — |
| Service name | Max 40 characters | Required |
| Service description | Max 200 characters | Optional |
| Q&A prompt template | Max 500 characters | Optional |
| Initial vector search TopK | 1–100 | 100 |
| Initial keyword search TopK | 1–100 | 100 |
| Similarity threshold | 0.01–1.0 | — |
| Max recall count | 1–20 | 5 |
| Tag length | Max 32 characters per tag | Press Enter to confirm input |
Datasets
Datasets enable importing files from external data sources into knowledge bases.
| Item | Limit | Notes |
|---|
| File dataset storage (platform-hosted) | 100,000 files / 1 TB | Free tier, time-limited |
| Files per upload | 50 | — |
| Dataset name length | 20 characters | — |
| Dataset description length | 200 characters | — |
API Limits
Bulk Operations
Request Rate Limits
All APIs enforce request rate limits (QPS). Exceeding them returns HTTP 429. Full throttling rules are documented in Rate Limits.
| API category | Max QPS |
|---|
| Retrieval | 2,000 |
| Task status queries | 20 |
| Document / file queries | 5–15 |
| Knowledge base management | 10 |
| Chunk management | 10 |
| Dataset management | 2–5 |
| Monitoring data | 1 |
If current quotas do not meet your business needs, submit a support ticket to request an increase.
