Database Technologies

Depsez has Started a New project called Curo, which is currently made for Unix/Linux and is in initial phase. So, I thought to look at how it works and how normal user, who knows using psql, can benefit from it. Before Installing Curo, user has to make sure, he has postgreSQL client: psql and following package installed on his Linux/Unix System: 1. Bash 2. dialog If you have above required packages on your machine, then you can move for Curo installation. Curo Installation is very simple. Following are the steps which can be use to install Curo on Unix/Linux System: 1. Download the Curo from Following link: https://github.com/omniti-labs/curo Above link will give you file similar to given below: omniti-labs-curo-48a4f31.tar.gz 2. Untar the file using following command: tar -xvf omniti-labs-curo-48a4f31.tar.gz 3. Copy omniti-labs-curo-48a4f31 to users home directory as given below: cp omniti-labs-curo-48a4f31 ~/.curo 4. Now configure .inputrc and .editrc file as given...

I had seen people ask Questions about finding the edb-jdbc/postgresql driver version with Database Version. So, I thought to give one java script which can be use to find Database Details with edb-jdbc version. Following is a JAVA Code which can be use to find the Database Version and EDB-JDBC/postgresql-jdbc Version: File Name: DBinfo.java import java.sql.*; public class DBinfo { public static void main(String[] args) { try { Class.forName("com.edb.Driver"); Connection con = DriverManager.getConnection("jdbc:edb://localhost:5444/edb", "enterprisedb","edb"); // Advanced Server Database Connection Information DatabaseMetaData dbmd = con.getMetaData(); System.out.println("===== Database info ====="); System.out.println("DatabaseProductName: " + dbmd.getDatabaseProductName() ); System.out.println("DatabaseProductVersion: " + dbmd.getDatabaseProduc...

Logrotator is a small C program which is well written and available on most of the UNIX based OS. It allows automatic rotation, compression of logfiles and removal of old logfiles. This small file can be use to manage applications logfiles. It can also use for managing slony logfiles. For managing logfiles using logrotator user has to make a logrotator conf file, and can be scheduled in crontab for managing logile. Let see how you can make a logrotator configuration file for slony. I have slony master/slave daemon running on my slave maching has following location for slony logfiles: /opt/PostgresPlus/9.0AS/slony_test/slony1/node1 -- For master /opt/PostgresPlus/9.0AS/slony_test/slony1/node2 -- For slave. For managing logfile, user can make logrotator configuration file similar to given below: Configuration filename: /etc/logrotate.d/slonylogfiles "/opt/PostgresPlus/9.0AS/slony_test/slony1/node[12]/*.log" { rotate 5 mail vibhor.aim@gmail.com ...

Today, I though to mention some of Oracle workarounds which can be use for Migration of Oracle Database to PPAS 9.0(EnterpriseDB). 1. UTL_RAW.CAST_TO_RAW This is a Oracle Packaged Function, which can be use to convert VARCHAR2 value into RAW Value. Lets see its example in Oracle: SQL> select utl_raw.cast_to_raw('TESTING TESTING') from dual; UTL_RAW.CAST_TO_RAW('TESTINGTESTING') -------------------------------------------------------------------------------- 54455354494E472054455354494E47 Since PPAS 9.0, doesn't have this package in 9.0, therefore user can use postgresql function decode() for converting of varchar datatype to RAW/bytea data. Following is an example: edb=# select decode('TESTING TESTING','escape') from dual; decode ---------------------------------- \x54455354494e472054455354494e47 (1 row) which is a same output. 2. UTL_RAW.CAST_TO_VARCHAR2 Using this packaged function user can conver...

This has been asked many times, so I thought to write steps for enabling ssl: Following are steps, which can be use to enable ssl in postgreSQL: 1. Generate a passphrase protected certificate using following command: openssl req -new -text -out cert.req Snapshot is given below: Generating a 1024 bit RSA private key ....................++++++ ...................................................++++++ writing new private key to 'privkey.pem' Enter PEM pass phrase: Verifying - Enter PEM pass phrase: ----- You are about to be asked to enter information that will be incorporated into your certificate request. What you are about to enter is what is called a Distinguished Name or a DN. There are quite a few fields but you can leave some blank For some fields there will be a default value, If you enter '.', the field will be left blank. ----- Country Name (2 letter code) [AU]: State or Province Name (full name) [Some-State]: Locality Name (eg, city) []: Organization Name...

One of my Colleague had asked how he can use Nagios for PostgreSQL Monitoring. So, I thought of writing steps to show the blog readers about nagios Configuration for PostgreSQL/PPAS. Following are the steps: 1. Download Nagios Core wget http://nagios.sourceforge.net/download/cvs/nagios-HEAD.tar.gz 2. For Installing Nagios, following packages would be required,so make sure you have them installed on your server. gcc make binutils cpp libpq-dev libmysqlclient15-dev libssl0.9.8 libssl-dev pkg-config apache2 libgd2-xpm libgd2-xpm-dev libgd-tools libpng12-dev libjpeg62-dev perl libperl-dev libperl5.8 libnet-snmp-perl 3. Create nagios user and group as given below: [root@localhost]# useradd nagios [root@localhost]# passwd nagios [root@localhost]# groupadd nagcmd [root@localhost]# usermod -G nagcmd nagios [root@localhost]# usermod -G nagcmd apache 4. Now, untar Nagios Core/Nagios Plugin using following command: tar -xvf nagios-HEAD.tar.gz 5. Now configure Nagios...

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...