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Krystian Zieja's blog

Configure Database Mail in Sql Server 2008

Database Mail in Sql Server 2008 enables sending outbound mail messages. Although the primary use of Database Mail is to send alert messages to administrators, it can also be used to send results of the query, or in Transact - SQL code. Database Mail uses the Simple Mail Transport Protocol (SMTP) to transmit mail messages. It is important to remember that messages are sent by Sql Server Agent, so if it is not running the messages will be accumulated in msdb database and sent when Agent will be started.

How to install PowerShell on Windows Server 2008

Windows PowerShell is a command line and shell scripting language that helps IT specialist in managing their Windows infrastructure. Although PowerShell ships with all versions of Windows Server 2008, it is not installed by default. This blog post will describe the steps you need to follow to install it.


Killing Sessions in Oracle

Sometimes Oracle Database Administrators needs to kill a sessions in Oracle Database. The best way to do it is to ALTER SYSTEM KILL SESSION statement. To use this statement we must provide SID and SERIAL# of the session we are going to kill.


Managing Redo Logs in Oracle

Redo Log Files are crucial for recovery in case of instance failure. Today I will show a bunch of commands how to manage them in Oracle Database. You can find more details on architecture of Redo Log Files in previous post How to multiplex Redo Logs in Oracle


How to multiplex Redo Logs in Oracle

Redo Log files records every change made by users. This guarantees that we will not lose any change, even if it was not written in Data Files due to instance failure. Oracle organizes Redo Logs in Redo Log Groups. Oracle requires at least two Redo Log Groups, each with at least one Redo Log Files to operate. Redo Logs are the most crucial component for recovery operations in case of instance failure, which means that Database Administrators should protect them well. All Redo Log Files in one Redo Log Group are identical. Having this in mind leads to that the best method of protecting Redo Log Files is to create multiple Redo Log Files in each Redo Log Group and put each Redo Log file from the same group on different physical disk. Multiplexing prevents from losing just one copy of the Redo Log File. When Redo Log Files are multiplexed the Log Writer Process (LGWR) writes simultaneously to all members of Redo Log Group.

How to multiplex Control Files in Oracle

Control File is a physical component of every Oracle Database, it is a small binary file, which records database structure. Control File includes information like database name, name and location of data files and redo log files, database creation timestamp, current log sequence number, checkpoint information. Additionally if we use RMAN for backup and we do use RMAN catalog, information about RMAN backups is stored in control file. Oracle Database requires at least one Control File to operate. Control Files must be accessible all the time the database is open.


Sql Server Error: 18452 Login failed for user

This one of the most common errors you can find on Sql Server or ASP.NET forums is Error 18452 Login failed for user. There are three causes, which could trigger that error:

  1. User tried to login using Sql Server Authentication but server allows only for Windows Authentication
  2. User tried to login using Sql Server authentication, but the login does not exist in Sql Server
  3. User tried to login using Windows Authentication, but the login is unrecognized Windows Principal

How to get procedure code in Oracle

How to get procedure code in Oracle
Frequently we need to find the procedure code, without using any developers’ tools like SQL Developer or TOAD. The easiest way to get the code is to use USER_SOURCE or DBA_SOURCE views or DBMS_METADATA PL/SQL Package.


Calculating Date Difference in Sql Server

Often we need to calculate the difference between two dates in Sql Server. Microsoft provided us with DateDiff function, which is very handy in such situations. The most often problem with DateDiff function is with its DatePart parameter.

Oracle ORA-0xxxx: Message xxxx not found

Database Administrators can see below message on some systems
ORA-0xxxx: Message xxxx not found; No message file for product=RDBMS, facility=ORA
Usually it just indicates that the environment was wrongly setup.