sapply(dbListConnections(drv=PostgreSQL()), dbDisconnect)
[1] TRUE TRUE TRUE
> dbConnect(drv="PostgreSQL", host=dbhost, port=PT, dbname=DB, user=UID, password=PW)
<PostgreSQLConnection:(24759,3)> 
> library("RMySQL")

Attaching package: ‘RMySQL’

The following object is masked from ‘package:RPostgreSQL’:

    dbApply

> dbConnect(drv="PostgreSQL", host=dbhost, port=PT, dbname=DB, user=UID, password=PW)
Error in mysqlNewConnection(dbDriver(drv), ...) : expired manager
> dbConnect(drv=PostgreSQL(), host=dbhost, port=PT, dbname=DB, user=UID, password=PW)
<Expired PostgreSQLConnection:(24759,4)> 
> detach(package:RMySQL)
> dbConnect(drv=PostgreSQL(), host=dbhost, port=PT, dbname=DB, user=UID, password=PW)
<Expired PostgreSQLConnection:(24759,5)> 
> dbConnect(drv="PostgreSQL", host=dbhost, port=PT, dbname=DB, user=UID, password=PW)
Error in mysqlNewConnection(dbDriver(drv), ...) : expired manager