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Everytime if I do PQconsumeInput (when the backend channel gets readable) I check for the return value. (0 == error) and generate a notification manually, e.g. fixed string connection_closed) and pass it to the TCL event queue. The only other thing I had to do is to comment out removing all pending events in PgStopNotifyEventSource whenever the connection was unexpectedly closed (so the manually generated event will not be deleted). A broken backend connection triggers a notify event to the client (fixed notification string "connection_closed") so proper action can be taken to switch to another database server etc. Remember that this is event driven. If you have applications, that have idle database connections most of the time, you'll get immediate feedback of a dying server. Upon connection to the server issue a pg_notify for notify event "connection_closed" and whenever the backend crashes (which it does do in very very rare cases) you get an event driven recovery. (of course the Tcl-Event loop has to be processed). Issuing a notification "connection_closed" on a still working database could be used for switching to another db-server (which I've actually impelemented right now). Gerhard Hintermayer |
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| COPYRIGHT | ||
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PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains several language bindings, including C, C++, Perl, Python, and Tcl, as well as drivers for JDBC and ODBC. See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Changes between all PostgreSQL releases are recorded in the file HISTORY. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at ftp://ftp.postgresql.org/pub/. For more information look at our web site located at http://www.postgresql.org/.