how many people can connect to the mdb - Web Wiz Support and Community Forums

255 Concurrent users maxium. But performance is on a sliding scale

that does not seem like much!!

For that you should consider SQL Server, it will also be tonnes better for performance.

Heres all the limitations: (cut short - unlimited)

	Maximum sizes/numbers
Object	SQL Server 7.0	SQL Server 2000
Batch size	65,536 * Network Packet Size¹	65,536 * Network Packet Size¹
Bytes per sort string column	8,000	8,000
Bytes per text, ntext, or image column	2 GB-2	2 GB-2
Bytes per GROUP BY, ORDER BY	8,060	8,060
Bytes per index	900	900²
Bytes per foreign key	900	900
Bytes per primary key	900	900
Bytes per row	8,060	8,060
Bytes in source text of a stored procedure	Lesser of batch size or 250 MB	Lesser of batch size or 250 MB
Clustered indexes per table	1	1
Columns in GROUP BY, ORDER BY	Limited only by number of bytes per GROUP BY, ORDER BY	Limited only by number of bytes per GROUP BY, ORDER BY
Columns or expressions in a GROUP BY WITH CUBE or WITH ROLLUP statement	10
Columns per index	16	16
Columns per foreign key	16	16
Columns per primary key	16	16
Columns per base table	1,024	1,024
Columns per SELECT statement	4,096	4,096
Columns per INSERT statement	1,024	1,024
Connections per client	Maximum value of configured connections	Maximum value of configured connections
Database size	1,048,516 TB³	1,048,516 TB³
Databases per instance of SQL Server	32,767	32,767
Filegroups per database	256	256
Files per database	32,767	32,767
File size (data)	32 TB	32 TB
File size (log)	4 TB	32 TB
Foreign key table references per table	253	253
Identifier length (in characters)	128	128
Instances per computer	N/A	16
Length of a string containing SQL statements (batch size)	65,536 * Network packet size¹	65,536 * Network packet size¹
Locks per connection	Max. locks per server	Max. locks per server
Locks per instance of SQL Server	2,147,483,647 (static) 40% of SQL Server memory (dynamic)	2,147,483,647 (static) 40% of SQL Server memory (dynamic)
Nested stored procedure levels	32	32
Nested subqueries	32	32
Nested trigger levels	32	32
Nonclustered indexes per table	249	249
Objects concurrently open in an instance of SQL Server⁴	2,147,483,647 (or available memory)	2,147,483,647 (or available memory)
Objects in a database	2,147,483,647⁴	2,147,483,647⁴
Parameters per stored procedure	1,024	2,100
REFERENCES per table	253	253
Rows per table	Limited by available storage	Limited by available storage
Tables per database	Limited by number of objects in a database⁴	Limited by number of objects in a database⁴
Tables per SELECT statement	256	256
Triggers per table	Limited by number of objects in a database⁴	Limited by number of objects in a database⁴
UNIQUE indexes or constraints per table	249 nonclustered and 1 clustered	249 nonclustered and 1 clustered