1.5.1 Operating Environment

The following figure shows the configuration of the Symfoware Server operating environment. The tables given below list the roles of the OS resources and Symfoware Server resources.

Table 1.1 OS resources
Type	Role
Shared memory	Used when a database process exchanges information with an external process.
Semaphore

Table 1.2 Symfoware Server client resources
Type	Role
Connection service file	Specifies information, such as the host name, user ID, and password, for connecting to Symfoware Server
Password file	Securely manages the password for connecting to Symfoware Server
CA certificate file	CA (certificate authority) certificate used for server authentication when encrypting communication data

Table 1.3 Server resources of Symfoware Server
Type	Role
Database cluster	Database storage area on the database storage disk. It is a collection of databases managed by an instance.
System catalog	Contains information required for the system to run, including the database definition information and the operation information created by the user
Default tablespace	Contains table files and index files stored by default
Transaction log	Contains log information in case of a crash recovery or rollback. This is the same as the WAL (Write Ahead Log).
Work file	Work file used when executing applications or commands
postgresql.conf	Contains information that defines the operating environment of Symfoware Server
pg_hba.conf	Symfoware Server uses this file to authenticate individual client hosts
Server certificate file	Contains information about the server certificate to be used when encrypting communication data and authenticating a server
Server private key file	Contains information about the server private key to be used when encrypting communication data and authenticating a server
Tablespace	Stores table files and index files in a separate area from the database cluster
Backup	Stores the data required for recovering the database when an error, such as disk failure, occurs
Database backup	Contains the backup data for the database
Archive log	Contains the log information for recovery.
Core file	Symfoware Server process core file that is output when an error occurs during a Symfoware Server process
Key management server or key management storage	Server or storage where the master encryption key file is located
Master encryption key file	Contains the master encryption key to be used when encrypting storage data. The master encryption key file is managed on the key management server or key management storage.