System Limits

Workspace-Level Limits

Components	Limit
Maximum workspaces in a group	5
Maximum number of workspaces to which a database can be attached in R/W mode	1
Maximum workspace size	S-80 (vcpu 640, memory 5120 GB) Refer to the pricing page for more details.
Number of databases per workspace	No fixed limit. It depends on the size of each database. Databases are sized differently based on the number of partitions, amount of data, metadata and number of tables, etc. Refer to SingleStore Helios Sizing Guidelines for more details.
Maximum number of concurrent queries	This varies according to the deployment size.
Maximum simultaneous client connections	This varies according to the deployment size.

Database-Level Limits

Item	Max Spec (enforced)	Comments
Number of tables in a database		Each table costs some per-table memory overhead.
Number of partitions in a workspace	None
Number of database partitions per node	2414

Table-Level Limits

Item	Max Spec (enforced)	Comments
Number of columns per table	4096
Row size in bytes	64KB *	Limit does not apply to variable-length strings such as VARCHAR, VARBINARY, TEXT, etc.
Length of names in characters (applies to table names, column names)	256
Number of indexes per table	63
Number of columns per index	32
Number of tables in a join for each SELECT	253
Number of entries in a `SELECT` projection (target) list	12800

* The number of fields that will fit in the 64KB maximum row size is determined by the field types and how rows are laid out in the in-memory rowstore format. In some cases, writes (inserts and updates) to columnstore tables are implemented by storing the newly written rows in a rowstore format before flushing them to the column-oriented format. The row size limit applies to fixed-width data which includes a 4-byte nullability flag for nullable fields. The row size limit does not include the body of variable-width fields, but only the in-row portion, which includes an 8-byte memory location pointer and an optional 4-byte nullability flag. The sum of the in-row data size for all columns cannot exceed 64KB."

Naming Constraints

Item	Constraints
General	Maximum length is 64 characters unless specified otherwise below. Name cannot be blank. Name cannot end with a space.
Database names	Database names can only contain alphanumeric characters and underscores, and cannot start with a digit.
Table names	Table names can contain both alphanumeric and non-alphanumeric characters, but cannot contain the `/` character.
Other database objects (stored procedures, views, user-defined functions, user-defined aggregate functions, and table-valued functions)	Maximum length of 256 characters.
User names	Maximum length of 32 characters.
Role names	No length limit. Cannot contain commas or spaces.
Group names	No length limit. Cannot contain commas or spaces.