Database

Fixing Postgresql Error, “initdb: could not change permissions of directory, Permission denied”

By / 7 May 2014 / Database, Programming / , , ,

Today im trying to install postgresql 9.3 on my windows server 2003 ( old server actually ), and i found a very weird error. Somehow im unable to complete the installation due to error “could not change permission of directory, permission denied”. Below is the complete error stacktrace,

fixing permissions on existing directory D:/PostgreSQL/9.1/data ... 
initdb: could not change permissions of directory 
"D:/PostgreSQL/9.1/data": Permission denied 

Called Die(Failed to initialise the database cluster with initdb)... 
Failed to initialise the database cluster with initdb 

Script stderr: 
  Program ended with an error exit code

It happen even after i put the installation folder outside “Program Files” folder, due to windows’ Program Files permission folder setting.

After several hours trying, i found out that the workaround is actually simple. I just create a new folder, i named it “dodol” set the permission to “everyone” and install my postgresql into that folder.

postgresql folder installation
postgresql folder installation

And my postgresql is installed without any problem.

How to Inserting 0 To an AutoIncreament Field on MySql

By / 6 January 2014 / Database, Programming / , , ,

Let say i have this table,

CREATE TABLE `refproductscale` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `scale` varchar(255) NOT NULL,
  `del` set('y','n') NOT NULL DEFAULT 'n',
  PRIMARY KEY (`id`)
)

I dont know why, but everytime im inserting ‘zero’ as its id, suddenly it changes into an increament number.
But with this script, im able to insert ‘zero’ as its id. This is my script,

SET SQL_MODE = "NO_AUTO_VALUE_ON_ZERO";
insert into refproductscale values(0, 'none', 'n');

And this is the result,

All i have to do is use NO_AUTO_VALUE_ON_ZERO before i do insert query. 😉

How to Count Number of Tables and Views from Oracle and DB2

By / 17 October 2012 / Database, Programming / , , , , ,

Several days ago i had a project that made me had to do data migration from DB2 to Oracle.
For validity check, i had to count number of tables and views from DB2 before migrated and number of tables and views on Oracle after ive migrate it.

Okay enough chit-chat, this is my queries.
Count DB2’s number of tables

Select Count(*) from syscat.tables
where tabschema = 'YOUR_SCHEMA_NAME' 
AND type = 'T'

And this is how to count DB2’s View numbers

Select Count(*) from syscat.tables
where tabschema = 'YOUR_SCHEMA_NAME' 
AND type = 'V'

This is how to count number of tables from Oracle

select owner, count(*) from dba_tables
where owner = 'YOUR_OWNER_NAME'
group by owner

And this is how to count number of views from Oracle

select owner, count(*) from dba_views
where owner = 'YOUR_OWNER_NAME'
group by owner

Hope it will help others,
cheers (D)