Progress
Database Administration
Guide and Reference


Controlling Memory Use

Table 14–1 lists the startup parameters used to fine-tune memory allocation on the server system.

Table 14–1: Startup Parameters That Affect Memory Allocation 
Startup Parameter
Suggested Use
Blocks in Database Buffers (-B)
Increasing the buffer size decreases the amount of database record I/O by increasing the number of buffers available in memory. This increases memory usage. Increase the -B parameter to use more memory to reduce I/O. Decrease the -B parameter if memory is limited or if database buffer I/O causes paging.
Maximum Clients per Server (-Ma)1
If some number of remote clients overloads the server or exhausts the file descriptors on a system, set this parameter to limit the number of clients.
Maximum Servers (-Mn)1
If a server becomes overloaded with clients, set this parameter to limit the number of servers. If you significantly increase this parameter, you should also increase the Minimum Clients per Server (-Mi) parameter.
Number of Users (-n)
On nonshared-memory systems, use this parameter to limit the total number of users below the level that overloads the database server.

On shared-memory systems, set this parameter large enough to include both local and remote users.

Pin Shared Memory (-pinshm)
Use this parameter to prevent the database engine from swapping shared memory contents to disk.
  1. Relevant only to database accessed using client/server.


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