A database connection forms a channel through which all activity from the client application takes place. Client applications cannot interact with the database server until a connection is made. When the database server connection is made, a user’s ID determines what actions they are authorized to perform on the database server.
When a user connects to a database, the database server assigns the user’s connection a unique connection ID. For each new connection to the database server, the server increments the connection ID value by 1. These connection IDs are logged in the -z server output. The connection ID can be used to filter request logging information, identify which connection has a lock on the database, or track the total number of connections to a server since it started and the order in which those connections were made. See Request logging and How locking works.
You can use the CONNECTION_PROPERTY function to obtain a user's connection-id. See CONNECTION_PROPERTY function [System].
Connecting with SQL Anywhere APIs
Connecting from desktop applications to a Windows Mobile database
Connecting from Sybase Central, Interactive SQL, or the SQL Anywhere Console utility
Creating ODBC data sources
Connecting to a database using OLE DB
Using integrated logins
Sample SQL Anywhere database connections
Disconnecting from a database
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