oracle installation memory

Oracle is an enterprise-level database management system with the advantages of high efficiency, stability, and strong security. It is widely used in enterprise information construction. When installing the Oracle database, you need to configure a certain hardware environment, of which memory is a very important part. This article will introduce the memory-related contents of Oracle installation and provide relevant solutions.

1. Memory requirements of Oracle database

The memory requirements of Oracle database depend on many factors, including but not limited to the following aspects:

1. Size of application: Large enterprise applications require higher memory to support more users and process more data.
2. Size of the database: Databases that store large amounts of data require more memory to manage indexes, caches, and buffer pools.
3. Complexity of query operations: If a database frequently performs complex queries, more memory is needed to speed up query operations.

In general, the larger the memory, the more functions and optimizations the Oracle database can expand. According to Oracle official documentation, the following are the minimum memory requirements for Oracle 12c:

• The minimum memory requirement for Oracle Database 12c Standard Edition One and Enterprise Edition is 2GB

• Oracle Database 12c Standard Edition and Standard The minimum memory requirement for Edition 2 is 4 GB

• The minimum memory requirement for Oracle Database 12c Enterprise Edition is 8 GB

Of course, these are only the minimum memory requirements for Oracle 12c, if your application If you require higher memory, you need to increase the memory accordingly.

2. Oracle installation

1. Determine the memory size

Before installing Oracle, you must know the memory size of the server in order to adjust the Oracle parameter configuration. Based on the minimum memory requirements mentioned above, it is recommended that you increase the server's memory to at least twice the minimum requirements before installing Oracle to ensure that the server has enough memory to support the database.

2. Configuring Oracle basic environment

Before installing Oracle, you need to configure the operating system environment variables and user environment variables. For example, on Linux, you need to ensure that the $ORACLE_HOME and $ORACLE_SID environment variables are set. This can be accomplished by editing the /etc/profile file or the user's .profile file.

3. Download and install Oracle software

After downloading the Oracle installer, you can run the installer. The installer has a graphical user interface that allows you to perform the following steps:

• Execute the preinstallation script and review any warning or error messages.
• By executing the installation program, enter the installation options, and install the Oracle database software.
• Run dbca (database configuration assistant) to create and configure the database.

3. Oracle memory optimization

Oracle has many parameters that can optimize memory usage. Some of the most important optimization options are discussed below:

1. SGA and PGA adjustments

All memory usage of the Oracle database can be divided into two main areas: the system global area ( SGA) and Process Global Area (PGA). SGA includes shared pool, buffer cache, redo cache, etc. PGA includes private SQL area, link-shared SQL area and PL/SQL storage area.

When you need to change the size of these areas, you can modify the init.ora file or use the alter system command.

2. Large page memory

By default, Oracle does not use large page memory. Using large page memory allows Oracle to use memory more efficiently. Setting large page memory can reduce memory fragmentation because Oracle allocates more memory pages and reduces the number of memory pages. to increase Oracle memory utilization and performance.

3. Memory Monitoring and Tuning

There are many tools you can use to monitor Oracle memory usage to find out which processes are consuming a lot of memory. For example, you can use Oracle's memory monitoring and analysis tools to monitor SGA and PGA usage.

4. Other optimization options

If you want to further optimize Oracle's memory usage, you can also consider using RAM disks, optimizing storage indexes, etc.

Summary:

When installing Oracle, the size of the server memory should be determined based on multiple factors such as the size of the application, the size of the database, and the complexity of the query operation. At the same time, it is also necessary to Configure Oracle's basic environment, select appropriate memory optimization options, such as adjusting the size of SGA and PGA, enable large page memory, etc., as well as perform memory monitoring and adjustment. Care must be taken in each step to ensure that the Oracle database can run stably and efficiently after successful installation.

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