The table space can only belong to a database each database with a control file (recommended 3, putting on different disks) Each database has a minimum table space (System table space) to establish the purpose of the SYSTEM table space is to try to Put the same table as the destination to improve the use efficiency Each database has a few online log files. A data file can only belong to a table space. One data file is added to a table space, it is no longer available again from this table. Space is removed, and you can no longer join in other tablespaces to create new tablespaces. To create a new data file data file is formatted by Oracle to Oracle block, the size of the Oracle block is set when the database is created. And in the future, a single transaction cannot be changed to a plurality of returning segments. The indefinite table does not contain the ROWID value. There is no benefit Oracle to create a default database when installing, instance is the largest The length of 16KB (with 2K, 4K, 8K, 16K) Each database is maximum file (by block size) 2K block 2000 file 4K block 40000 file 8K block or more 65536 file Oracle Server can start multiple databases at the same time Only one version of Oracle Database System can be installed on a set of operation systems, a set of Oracle database systems can have multiple Oracle Databases Each Oracle database has a database instance (instance), and there are multiple Oracle databases on a set of operating systems. Instance start
