Recommendations for agileplm database parameter optimization

Requirements describe

stay AgilePLM As the number of users and applications increases, some database problems will be encountered during the maintenance of , It is recommended that you adjust the parameters of the database in advance . Prevent problems from happening . Avoid unnecessary losses to the production environment .

The main problem

1. AgilePLM Oracle The default number of links is 150, It needs to be dynamically adjusted according to the number of users and applications .
2. AgilePLM Oracle The memory setting of the needs to be dynamically adjusted according to the parameters of the physical machine .

Solutions

Oracle maximum connection

The recommended maximum number of connections is closely related to the following parameters .

Number of concurrent users

First, determine the number of concurrent users of the system , The number of concurrent users refers to the number of users who log in to the system at the same time .

The total number of registered users of an enterprise's internal management system may be 1000, This is called the number of potential users .

this 1000 Of registered users may have 500 Users log in to the system every day to use the system . This is the number of concurrent users .

The maximum number of connections should be greater than the number of concurrent users . In the case above , The maximum number of connections is >=500.

Number of applications

The number of applications is connected to the same Oracle Number of systems on the database . stay AgilePLM In the process of implementation , Additional systems are often developed to provide additional functionality . Each system has its own database connection pool . for example ：

1. Agile application （ Include file servers ）
2. Data synchronization system （CRM,ERP,MES etc. ）
3. Web operating system （ to Agile Provide operation menu or ）
4. Event program system （ If you do not connect to the database in the event program, you do not need to consider ）

The maximum number of connections should be a multiple of the number of applications .

for example ： With the same number of concurrent users , If the number of previous connections is 150 It can meet the needs of daily use , If the application number is like the example above, there is a 4 individual , The maximum number of connections should be at least 600 individual .

A larger number of connections requires a larger memory setting as a support , Therefore, if the connection number is adjusted and an error is reported, the memory setting needs to be adjusted .

Memory settings

Memory settings refer to Oracle Of SGA,PGA, Shared pool and other related settings .

Oracle 9i introduce pga_aggregate_target, It can be done automatically PGA Adjustment ;

Oracle 10g introduce sga_target, It can be done automatically SGA Adjustment ;

Oracle 11g These two parts are integrated , introduce memory_target, Can automatically adjust all memory , In other words, just adjust this parameter Oracle It will automatically help us adjust all memory related parameters . that memory_target Adjust to what size is appropriate ？

memory_target

If a server has only one database installed and only one instance is running . that memory_target The maximum size that can be adjusted to physical memory 80%. But if there are other applications or instances, you need to reduce the memory occupied by other applications .

Operation steps

A lot of knowledge has been mentioned above , Here are the actual operation steps .

matters needing attention

Once the database parameters are adjusted in the following way , about windows Please do not use the system service mode to restart the operating system . Otherwise, the parameters will be reset and need to be adjusted again . Friends who know how to adjust permanently can also leave a message to tell me .

First, make sure that the database uses spfile Mode start

-- All of the following commands are best placed in one sqlplus Execute... On the command line .
--  Check whether the database is 100 million spfile start-up , If values Corresponding value , Said is spfile Starting up . Otherwise it's not 
show parameter spfile;
create spfile from pfile;

shutdown immediate;
startup;

---------------------  Memory parameter adjustment  ---------------------------
-- View shared pool size 
show parameter shared;
-- see target size 
show parameter target;
show parameter sga;

-- First the sga and pga,target Modulation 0, Otherwise it will affect memory_target Set up 
alter system set sga_target=0 scope=spfile; 
alter system set pga_aggregate_target=0 scope=spfile; 
--memory_target Will automatically adjust sga_target and pga_aggregate_target
alter system set memory_target=10g scope=spfile; 

---------------------  Maximum connections adjustment  ---------------------------
--  View the current number of connections 
select count(*) from v$process;
--  See the maximum number of connections 
show parameter processes;
show parameter session;
--  Modify the maximum number of connections ,session The number will be adjusted automatically 
alter system set processes = 600 scope = spfile;

-- Restart to make the changed settings take effect 
shutdown immediate;
startup;