The RecoveryStartInterval is used to retry a reconnection that have encountered reconnectable errors. The RecoveryStartInterval is defined as the first time period to wait between unsuccessful efforts to reconnect. It is used to retry reconnection attempts.

The TdConnectionStringBuilder.RecoveryIntervalFactor is used to modify the RecoveryStartInterval after the first retry is attempted, by adding the RecoveryIntervalFactor to the initial delay period. Each successive delay period will be modified by the RecoveryIntervalFactor until the delay period exceeds the TdConnectionStringBuilder.RecoveryMaximumInterval. The RecoveryMaximumInterval is used to set the upper limit on the calculated delay period, until TdConnectionStringBuilder.RecoveryTimeout expires or the reconnection fails.

For example if the RecoveryStartInterval is 2 seconds, the RecoveryMaximumInterval is 16 and the RecoveryIntervalFactor is 2. The delay time between each retry attempt will be calculated as 2, 4, 6, 8, 10 12, 14, 16, 16, 16, etc. If the RecoveryIntervalFactor is 0, the RecoveryStartInterval will be used as the delay period for all retryable attempts, as the RecoveryIntervalFactor will not change the delay period.

Default Value: 2 seconds

Reference

TdConnectionStringBuilder Class
TdConnectionStringBuilder Members