Limits

This page lists some known limitations that users may encounter when using Zilliz Cloud.

Zilliz Cloud platform

This section lists the limitations of Zilliz Cloud platform.

Zilliz Cloud account password

Length: 8 to 128 characters.
Components: Upper case letters, lower case letters, numbers, and special characters.
Special characters: ~, !, @, #, $, %, ^, &, *, ?, _, and -.

Project name

Length: 1 to 64 characters.
Components: Upper case letters, lower case letters, numbers, or special characters.

Database name

Length: 1 to 32 characters.
Components: Upper case letters, lower case letters, numbers, or special character -.

Database username

Length: 2 to 32 characters.
Components: Lowercase letters, numbers, or special character _.
Starts with a letter, and ends with a letter or a digit.
Database-level unique.

Database user password

Length: 8 to 64 characters.
Components: Upper case letters, lower case letters, numbers, and special characters.
Special characters: !, @, #, $, %, ^, &, *, (, ), _, +, - and =.

Zilliz Cloud database

This section lists the limitations of Zilliz Cloud database.

Length of a resource name

Resource	Limit
Collection	255 characters
Field	255 characters
Index	255 characters
Partition	255 characters

Naming rules

The name of a resource can contain numbers, letters, dollar signs ($), and underscores (_). A resource name must start with a letter or an underscore (_).

Number of resources

Resource	Limit
Collections	1024
Connection/Proxy	65535

Data types

Data type	Primary Key	Available on Zilliz Cloud
BOOL	No	Yes
INT8	No	Yes
INT16	No	Yes
INT32	No	Yes
INT64	Yes	Yes
FLOAT	No	Yes
DOUBLE	No	Yes
VARCHAR	Yes	Yes
FLOAT_VECTOR	No	Yes
BINARY_VECTOR	No	No

Index type

Currently, AUTOINDEX is the only index type that databases on Zilliz Cloud support. It is a proprietary index type for index auto-optimization and offers extremely high performance.

Number of resources in a collection

This table lists the maximum number of corresponding resources per collection.

	Shards	Fields	Indexes
1 CU	2	64	1
2 CU	2	64	1
4 CU	3	64	1
8 CU	8	64	1
12 CU	12	64	1
16 CU	16	64	1
20 CU	20	64	1
24 CU	24	64	1
28 CU	28	64	1
32 CU	32	64	1

String length

This table lists the maximum number of characters a VARCHAR field can hold.

Data type	Limit
VARCHAR	65,535

Vector dimensions

This table lists the maximum number of dimensions that a vector field can have.

Property	Limit
Dimension	32,768

Quota and limits

This table lists the upper limits on the RCP requests of the corresponding operation types that a collection processes per second.

	Insert	Search	Query	Delete
1 CU	4 MB/s	1 req/s	1 req/s	0.5 MB/s
2 CU	4 MB/s	1 req/s	1 req/s	0.5 MB/s
4 CU	6 MB/s	1 req/s	1 req/s	0.5 MB/s
8 CU	6 MB/s	1 req/s	1 req/s	0.5 MB/s
12 CU	8 MB/s	1 req/s	1 req/s	0.5 MB/s
16 CU	8 MB/s	1 req/s	1 req/s	0.5 MB/s
20 CU	8 MB/s	1 req/s	1 req/s	0.5 MB/s
24 CU	12 MB/s	1 req/s	1 req/s	0.5 MB/s
28 CU	12 MB/s	1 req/s	1 req/s	0.5 MB/s
32 CU	12 MB/s	1 req/s	1 req/s	0.5 MB/s

Search

Vectors	Recommended
`topk` (number of the most similar results to return)	10,000
`nq` (number of the search requests)	10,000

Zilliz Cloud APIs

You can use Milvus SDK directly to manipulate the databases on Zilliz Cloud. Each managed vector database on Zilliz Cloud has a default user named db_admin. This section focuses on the default privileges that this user has, and they are

Category	Interface	Privileges
Category	Interface	Zilliz Cloud UI	SDK
Alias	AlterAlias	No	No
	CreateAlias	No	No
	DropAlias	No	No
Authentication	CreateCredential	Yes	No
	DeleteCredential	Yes	No
	ListCredUsers	Yes	No
	UpdateCredential	Yes	No
Bulk-insert	BulkInsert	Yes	Yes
	GetBulkInsertState	Yes	Yes
	ListBulkInsertTasks	Yes	Yes
Collection	CreateCollection	Yes	Yes
	Delete	No	Yes
	DescribeCollection	Yes	Yes
	DropCollection	Yes	Yes
	Flush	No	Yes
	GetCollectionStatistics	No	Yes
	GetLoadingProgress	Yes	Yes
	GetPersistentSegmentInfo	No	No
	GetQuerySegmentInfo	No	No
	GetReplicas	No	No
	Insert	No	Yes
	LoadCollection	Yes	Yes
	ReleaseCollection	Yes	Yes
	ShowCollection	Yes	Yes
	GetLoadState	Yes	Yes
Index	CreateIndex	Yes	Yes
	DescribeIndex	Yes	Yes
	DropIndex	Yes	Yes
	GetIndexBuildProgress	Yes	Yes
	GetIndexState	Yes	Yes
Management	GetCompactionState	No	No
	GetCompactionStateWithPlan	No	No
	GetFlushState	No	Yes
	GetMetrics	Yes	Yes
	LoadBalance	No	No
	ManualCompact	No	Yes
Partition	CreatePartition	No	No
	DropPartition	No	No
	GetPartitionStatistics	No	No
	HasPartition	No	No
	LoadPartitions	No	No
	ReleasePartition	No	No
	ShowPartitions	No	No
Query and Search	Query	No	Yes
Query and Search	Search	Yes	Yes
RBAC	AddUserToRole	No	No
	CreateRole	No	No
	DropRole	No	No
	GrantRolePrivilege	No	No
	RemoveUserFromRole	No	No
	RevokeRolePrivilege	No	No
	SelectGrantForRole	No	No
	SelectGrantForRoleAndObject	No	No
	SelectRole	No	No
	SelectUser	No	No
System	GetVersion	No	Yes
System	CheckHealth	No	Yes

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