The Attachment Governor

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The InterBase server has an attachment governor that regulates the number of attachments to the server. Multiply the value of the USERS field in the license file by four to determine the total number of permitted concurrent attachments.

All successful attempts to create or connect to a database increment the number of current attachments. Both local and remote connections count toward the connection limit. Connections are permitted by the governor until the maximum number of concurrent attachments is reached. All successful attempts to drop or disconnect from a database decrement the number of current attachments.

Once the maximum number of attachments is reached, the server returns the error constant isc_max_att_exceeded (defined in ibase.h), which corresponds to the message:

Maximum user count exceeded. Contact your database administrator.