While most decisions made during installation can be changed at a later time, some decisions are either very difficult or impossible to change, so it is important that you make these decisions correctly at the time of installation. They include:
Creation of a starter database
Location of Oracle software (ORACLE_HOME )
Directory structure for Oracle datafiles
Language to be used
Database blocksize
Number, size, and location of online log files
Maximum number of datafiles to be allowed
We describe each of these decisions in the following sections.