TAF - Transparent Application Failover

TAF is a feature of OCI.  It allows applications to reconnect if the initial connection fails.  TAF can resume the SELECT operation but all active transactions are rolled back.  TAF supports 2 types of failover methods:

1.  BASIC:  Reconnection is established at failover time.

TAF without FAN (fast application notification)
srvctl add service -d DBALAB -s DBSRV -r dbsrv01,dbsrv02 -P BASIC

TAF with FAN:
srvctl add service -d DBALAB -s DBSRV -r dbsrv01,dbsrv02 -P BASIC
srvctl start service -d DBALAB -s DBSRV
srvctl modify service -d DBALAB -s DBSRV -q TRUE -P BASIC -e SELECT -z 180 -w 5 -j LONG

2.  PRECONNECT:  In addition to the intial connection, the shadow connection is also created.

No comments:

Post a Comment