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Creating user probe and alert in PEM 2.1

This is also one type of thing in which people are very interested. How to create probes other than PEM inbuilt probe? And how to create alert based on probe? Well answer is simple. Understand what probe is in PEM and then understand PEM Data detail. Probe in PEM requires following: 1. SQL Code which can be use to gathering data by pemagent. 2. Table in pemdata schema, which will be use for storing Current status/data of SQL. 3. History table (specially in pemhistory schema) where all history data will reside. Suppose user wants to monitor the Slony Replication using PEM (since, PEM doesn't have slony replication moniotring), so user can do following: 1. SQL Code which can be use for slony replication monitoring. We know that slony replication monitoring can be done using view sl_status of slony. So, user can create a SQL Code as given below for replication. select '_test_slony' as schema_name, st_origin,st_received, st_lag_num_events , st_lag_time from _test_slony...
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Remote Log Reading in PostgreSQL 8.4 and 9.0.

I was going through the one of the important feature (SQL/MED) which is coming feature of PostgreSQL 9.1. This feature enables user to access any external file, using SQL, from PostgreSQL Terminal. Magnus hagander's has also blogged about this feature and he has shown "How to access the PostgreSQL logfile using SQL/Med" . After going through his blog, I thought to do same with PostgreSQL 8.4/9.0 using plperl program. Following are the steps, which can be use to access the postgreSQL csv log file: 1. Change the log_destination parameter in postgresql.conf file of PG Instance Directory, to create csvlog of postgreSQL log. As given below. log_destination = 'stderr,csvlog' 2. Reload the changes in PostgreSQL, using following command: postgres=# select pg_reload_conf(); pg_reload_conf ---------------- t (1 row) 3. Connect to PostgreSQL database using psql command and Create following data type CREATE type pg_log_type as ( log_time timestamp(3) with ti...
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PostgreSQL Database Link to Oracle Database on Linux

I have seen question, like "How to make Database Link from PostgreSQL to Oracle?", always floats in PostgreSQL Community Forum. So, I thought to do some research on it and write a Blog. Cybertec (One of The PostgreSQL Database Company) has released a PostgreSQL Module ODBC Link, using which user can make Database link to any other database, including Oracle, MS SQL Server, PostgreSQL etc, which have ODBC compliant Data source. Lets see how you can make ODBC Connection from PostgreSQL to any ODBC compliant data source and fetch data. Installation of this module is very simple. Following are the steps which user can follow: 1. Install the unixODBC driver on your linux machine. user can use following useful link for Downloading and Installing the unixODBC Driver: http://www.unixodbc.org/ 2. Download ODBC-Link from following location: http://www.cybertec.at/download/odbc_link/ODBC-Link-1.0.4.tar.gz 3. Untar the downloaded file as given below: tar -zxvf ODBC-Link-1.0.4....
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