Knowledge base quotas and limits-Alibaba Cloud Model Studio(Model Studio)-阿里云帮助中心

Usage quotas

Category	Description	Limit
Number of knowledge bases	The number of knowledge bases that can be created by each Alibaba Cloud account.	Using RDS data source: 100 Other data sources: Unlimited
Knowledge base storage capacity (platform storage)	The free vector storage space dedicated to each knowledge base.	Ultimate Edition: 9,999 GB Standard Edition: 100 GB
Number of categories	The number of categories (parent + child) that can be created in each workspace.	500
Number of files	The number of files that can be uploaded to each workspace.	100,000
Number of files per knowledge base	The maximum number of files in a single knowledge base.	Unstructured knowledge base (for document search): No hard limit Structured knowledge base (for data query): 1 file (a single Excel or CSV file)
Number of data tables	The number of data tables that can be created in each workspace.	1,000
Table limits for AnalyticDB for PostgreSQL (ADB-PG) vector storage	The maximum number of rows and maximum size per row for a single data table when using AnalyticDB for PostgreSQL (ADB-PG) as the vector storage.	Maximum rows per table: 10,000,000 Maximum size per row: 100 KB

File upload

Supported formats

Knowledge bases for document search
Supported format	Limit
pdf, docx, doc, wps, pptx, ppt	Maximum 150 MB Maximum 1,000 pages
pdf, docx, doc, wps, pptx, ppt	Maximum 150 MB Maximum 1,000 pages
txt, markdown, html	Maximum 10 MB
xlsx, xls	Maximum 10 MB, within 100,000 rows
png, jpg / jpeg, bmp, gif	Maximum 20 MB Short side > 15 pixels, long side < 8,192 pixels, aspect ratio < 50

Knowledge bases for data query and image Q&A
Supported format	Limit
xlsx, xls	Maximum 100,000 rows Maximum 100 columns

Knowledge bases for audio and video search
Supported format	Limit
aac, amr, flac, flv, m4a, mp3, mpeg, ogg, opus, wav, webm, wma, mp4, mkv, avi, mov, wmv	Maximum 512 MB

Upload operations

Category	Description	Limit
Number of files per import	The number of files that can be imported in a single operation in the console. This limit does not apply to batch imports that use an API, for which a batch size of up to 10,000 files is recommended.	50
Number of tags	The number of tags that can be attached to a single file.	32

Data processing

Segmentation

Category	Description	Limit
Number of text segments	The number of text segments for a single file.	Unlimited
Text segment length	The number of tokens in a single text segment.	6,000

Chunk operation limits

Operations on chunks vary by knowledge base type:

Knowledge base type	Edit chunk	Add chunk	Delete chunk
Document search	Supported	Supported	Supported
Data query	Supported	Supported	Supported
Image Q&A	Supported	Supported	Supported
Audio and video search	Supported	Not supported	Supported

Note

When editing a chunk (UpdateChunk), the content length must be between 10 and 6,000 characters. You can delete up to 10 chunks per request (DeleteChunk).

Vectorization

See Text and multimodal embedding.

Category	Description
Vector model	For knowledge bases used for document search, data query, and audio/video search: Supports the text-embedding-v4 and text-embedding-v3 models. For knowledge bases used for image Q&A: Only the multimodal-embedding-v1 model is currently supported.
Vector dimensions	text-embedding-v4: 512 dimensions text-embedding-v3: 512 dimensions multimodal-embedding-v1: 1024 dimensions The preceding vector dimensions cannot be changed.

Retrieval

Category	Description	Limit
Concurrent retrieval	The core retrieval performance of the knowledge base itself. This does not include dependent links, such as calls to a sorting model. When you create a knowledge base (Ultimate Edition), you can preset a processing policy for dependency chain rate limiting.	Ultimate Edition: 50–10,000 queries per second (QPS) (adjustable, corresponding to 1–200 Retrieval Compute Units (RCUs)) Standard Edition: 1 QPS (fixed)
Number of retrieved text chunks	The number of text segments that can be retrieved in a single query.	20