模式Oracle 11倾心完美打造精简模式（oracle 11精简）

Oracle 11g: Building a Lean Database Environment with Minimal Mode

Oracle 11g provides a feature called Minimal Mode, which can be used to create a lean and optimized database environment. This mode is ideal for those who want to minimize the resources allocated to their database and reduce its size.

In Minimal Mode, only the essential database components are loaded into memory, including the system tablespace, the default temporary tablespace, the UNDO tablespace, and the SYSTEM roll-back segment. Other non-essential components are not loaded, which helps to reduce the size of the SGA (System Global Area), and improve performance.

To enable the Minimal Mode feature, users need to modify the initialization parameter file (INIT.ORA) for their database by adding the following line:

OPTIMIZER_MODE=MINIMAL

When this parameter is set to MINIMAL, the optimizer uses a simplified algorithm that prioritizes resource efficiency over query execution speed. This means that query execution may take longer, but the database will consume fewer resources.

Here is an example of how to enable the Minimal Mode feature in Oracle 11g:

1. Connect to the database using SQL*Plus or another SQL tool.

2. Check the current value of the OPTIMIZER_MODE parameter by running the following query:

SELECT VALUE FROM V$PARAMETER WHERE NAME=’optimizer_mode’;

3. If the value is not already set to MINIMAL, add the following line to your initialization parameter file:

OPTIMIZER_MODE=MINIMAL

4. Save and exit the file.

5. Restart the database for the changes to take effect.

To further optimize the database, users can also consider minimizing the number of tablespaces and datafiles used in their database. By consolidating data into fewer tablespaces and datafiles, disk usage can be reduced, and database mntenance tasks can be simplified.

In addition, users can implement other best practices for optimizing their database environment, such as regularly performing database mntenance tasks such as backups, index rebuilds, and system checks.

In conclusion, Oracle 11g’s Minimal Mode feature is an excellent option for users who want to create a lean and efficient database environment. By enabling this mode and implementing other best practices for database optimization, users can improve performance, minimize resources usage, and reduce the size of their database.