What should I do if Oracle prompts that there is insufficient memory?

Oracle prompts solutions to insufficient memory: 1. Increase physical memory, add new memory modules or upgrade memory, which requires a certain hardware cost; 2. Optimize memory usage and control memory through some memory-related parameters. Usage, which mainly includes SGA and PGA; 3. Release memory. After executing large query statements, related data can be cleaned up.

#The operating environment of this article: Windows 10 system, Oracle version 19c, DELL G3 computer.

Oracle 11: Solution to Out of Memory Problem

When using Oracle 11 database, insufficient memory may occur due to large data volume or high system pressure. This will lead to Oracle's performance degradation and even downtime. Therefore, resolving out-of-memory issues must be handled promptly and efficiently. In this article, some methods to solve the out of memory issue in Oracle 11 will be introduced.

1. Increase physical memory

Increasing physical memory is the most basic method to solve the problem of insufficient memory in Oracle 11. This can be adding a new memory module or upgrading the memory, which is relatively simple, but requires a certain hardware cost.

2. Optimize memory usage

Oracle 11 can control memory usage through some memory-related parameters, which mainly include SGA (System Global Area) and PGA (Program Global Area). In SGA, there are many adjustable parameters. Such as buffer cache (cache pool), shared pool (shared pool), etc., they have a direct impact on the performance of Oracle 11. PGA is specially set up by Oracle 11 to solve session-related memory problems. In PGA, there are mainly parameters such as sort_area_size (sort memory area) and hash_area_size (hash memory area). Reasonable adjustment of these parameters according to different situations can make more effective use of current memory resources, thereby reducing the problem of insufficient memory.

3. Release memory

When using Oracle 11, you can release memory by cleaning up unnecessary memory and other methods. For example, after executing a large query statement, the relevant data can be cleaned up to free up some memory. In addition, in Oracle 11, there are also some statements that can help release memory, such as ALTER SYSTEM FLUSH BUFFER_CACHE and other statements.

The following are some SQL scripts that can find inefficient and redundant memory usage by querying the usage of SGA and PGA.

1) Query the current usage of SGA and PGA:

SELECT * FROM v$sga;

SELECT * FROM v$pga_info;

2 ) Query the usage of each buffer of SGA:

SELECT name, bytes, bytes/1024/1024 MB

FROM v$sgastat

WHERE pool='shared pool '

ORDER BY bytes DESC;

3) Query the usage of each area of ​​PGA:

SELECT name, value_bytes from v$pgastat;

4 ) Query the usage of each buffer pool:

SELECT * FROM v$buffer_pool_statistics;

In the above query results, you can analyze them one by one as needed to find the cause of insufficient memory and perform corresponding actions. adjustment.

Summary

In Oracle 11, memory management is the key to ensuring system performance and stability. We solve the problem of insufficient memory in the database by increasing physical memory, optimizing memory usage, and releasing memory. When we discover the problem of insufficient memory, we should first confirm the cause of the insufficient memory and then take corresponding solutions. Reasonable memory configuration can make the Oracle 11 database have better performance and make the enterprise's business smoother.

Solution to Insufficient Memory During Oracle Installation

First of all, if your computer memory is less than the memory required by Oracle, then you need to increase the memory. Generally speaking, The operation of Oracle's database requires more than 4G of memory. For this reason, the computer memory can be increased to at least 4G, so as to meet the installation requirements of Oracle.

Secondly, you can reduce the memory space requested by the Oracle database application by changing the Windows registry:

1. Open the Windows registry, you can use Computer->Properties->Settings- >Technical Support Services to open the registry;

2. Find the HKEY_LOCAL_MACHINE->SOFTWARE->ORACLE->KEY_ORACLE portal;

3. Set the "ORA_WIN_MEMORY_SIZE" value to your The desired memory size;

4. Restart the computer to ensure that the changes take effect.

Finally, check the virtual memory settings of Windows, that is, set the virtual memory limit size of Windows to "Unlimited". Please do the following:

1. Open [Control Panel] and click [System] ];

2. Click [Advanced System Settings];

3. Under the [Performance] tab, click [Virtual Memory];

4. Select "Unlimited" , click [OK] to restart the computer.

The above is the solution to the problem of insufficient memory during Oracle installation. You can use all the above operations to solve the problem of insufficient memory during Oracle installation. However, it should be noted that if the computer has insufficient memory, try to Increase the memory and have enough memory space to install Oracle normally.

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