Kernel Resource Usage

max_files_per_process

Parameter description: Specifies the maximum number of simultaneously open files allowed by each server process. If the kernel is enforcing a proper limit, setting this parameter is not required.

However, on some platforms, such as most Berkeley Software Distribution (BSD) systems, the kernel allows individual processes to open many more files than the system can support. If the message "Too many open files" is displayed, set this parameter to a smaller value. Generally, the system must meet this requirement: Number of file descriptors ≥ Maximum number of concurrent statements x Number of database nodes x max_files_per_process x 3. This parameter is set based on the actual situation. If this parameter is set to a small value, valid secure file handles may be insufficient. As a result, the database instance is abnormal.

This is a POSTMASTER parameter. Set it based on instructions provided in Table 1.

Value range: an integer ranging from 25 to 2147483647.

Default value: 1024

shared_preload_libraries

Parameter description: Specifies one or more shared libraries to be preloaded at server start. If multiple libraries are to be loaded, separate their names using commas (,). Only the sysadmin user can access this parameter. For example, $libdir/mylib will cause mylib.so (or on some platforms, mylib.sl) to be preloaded before the loading of the standard library directory.

You can preinstall the GaussDB's stored procedure library using the '$libdir/plXXX' syntax as described in the preceding text. XXX can only be pgsql, perl, tcl, or python.

By preloading a shared library and initializing it as required, the library startup time is avoided when the library is first used. However, the time to start each new server process may increase, even if that process never uses the library. Therefore, set this parameter only for libraries that will be used in most sessions.

This is a POSTMASTER parameter. Set it based on instructions provided in Table 1.

• If a specified library is not found, the GaussDB service will fail to start.
• Each GaussDB-supported library has a special mark that is checked to guarantee compatibility. Therefore, libraries that do not support GaussDB cannot be loaded in this way.

Value range: a string.

Default value: security_plugin