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SAP Sybase SQL Anywhere 16.0 » SQL Anywhere Server - Database Administration » SQL Anywhere database connections » Database connections » Troubleshooting: connections


Troubleshooting: How to test embedded SQL and network connection performance (dbping)

You can use the Ping utility (dbping) to obtain information about the performance of embedded SQL connections and the network by specifying the -s or -st options. The following statistics are gathered:

Statistic Description
DBLib connect and disconnect The time to perform one DBLib connect and disconnect. The performance of connecting and disconnecting using other interfaces, such as ODBC, is typically slower than DBLib because more requests are required to complete the connection.
Round trip simple request The time it takes to send a request from the client to the server plus the time it takes to send a response from the server back to the client. The round trip time is twice the average latency.
Send throughput The throughput based on transferring 100 KB of data for each iteration from dbping to the database server.
Receive throughput The throughput based on transferring 100 KB of data for each iteration from the database server to dbping.

If your network has both high round trip times and high throughput, then reported throughput will be lower than your actual network throughput because of the high round trip times. Using dbping -s can be useful to give an indication of whether communication compression may improve performance. The performance statistics are approximate, and are more accurate when both the client and server computers are fairly idle. The transferred data can be compressed to approximately 25% of its original size if communication compression is used:

The following is an example of the output from dbping -s for the dbping command:

dbping -s -c "UID=DBA;PWD=sql;Server=demo16;DBN=demo"
SQL Anywhere Server Ping Utility Version
Connected to SQL Anywhere server "demo16" and database "demo".
Performance Statistic           Number            Total Time    Average
----------------------------    --------------    ----------    ------------
DBLib connect and disconnect      200 times        512 msec         2 msec
Round trip simple request       22100 requests    1024 msec        <1 msec
Send throughput                267500 KB          1024 msec    261230 KB/sec
Receive throughput             230400 KB          1024 msec    225000 KB/sec
Ping database successful.
 See also