After a successful connect, the Main Screen is displayed showing the most important round-the-clock system activities of the ADABAS server:
Fig.: Main Screen of CONTROL
The data fields in the Main Screen have the following meanings:
<Serverdb>
Name of the server database.
<Servernode>
Name of the computer within the network where the database server is installed.
<Date> <Time>
Date and time at which the displayed data was found out.
Usage Levels (in Bar Form)
Data
describes the current utilization level of the database. This measured value informs the operator whether the physical disk space must be expanded soon. The ADABAS server performs an "emergency shutdown"; i.e., it shuts down automatically when the usage level of the database is 100%.
Log
describes the current utilization level of the log. The database server shuts down ("emergency shutdown") when the usage level of the log is 100%.
The operator should therefore observe the log usage in order to start a manual backup of the log or of a log segment, if this should become necessary.
After a save of a log segment, the utilization level of the log will be decreased accordingly.
Sessions
describes the percentage use of the configured database server connections. When the maximum value is reached, no more connections can be established to the database server. Application programs attempting to connect to the database server receive a corresponding error message. This maximum value can be decreased or increased using the Configuration / Alter Parameters / Kernel menu function, by modifying the system parameter MAXUSERTASKS (see Section Installing a New Serverdb for "configuration parameters").
Other Information
Serverdb State
describes the current operating mode of the database server. The following table shows all operating modes of the ADABAS server and their meanings:
| OFFLINE: | The ADABAS server is not running. The database server kernel has not been started yet. Usually, the operator starts the database system directly in warm mode using the Operating / Restart menu function. |
| COLD: | The ADABAS server has been started successfully. All system parameters which were changed using the Configuration / Alter Parameters menu function are effective. Database activities are not possible. Only in this mode, some maintenance activities such as restoring the database or log, or modifying certain system parameters can be performed. |
| WARM: | This is the normal operating mode in which users can work with the ADABAS server. |
Background
shows whether a backup, a verify devspaces, or an update statistics is active in background.
Log Segments
shows whether a log segment is full and thus ready for saving.
Autosave Log
shows whether the automatic log backup has been enabled.
Remote SQL
shows whether the remote SQL server has been started, thus allowing users to access the server database from other computers.
Serverdb Monitoring
The following sizes refer to the start point of the serverdb or the last counter reset (see also Section Options / Reset Counter function).
SQL-Commands
shows the number of SQL statements issued since the last counter reset or serverdb start.
Logical Reads
shows the number of read accesses to the data cache performed since the last counter reset or serverdb start.
Logical Writes
shows the number of write accesses to the data cache performed since the last counter reset or serverdb start.
Data Cache Hit Rate
shows the percentage hit rate of accesses to the data cache since the last counter reset or serverdb start. The hit rate should be as close to 100% as possible. For an unfavourable hit rate (under 99%), you should search for the reasons.
Converter Cache Hit Rate
shows the percentage hit rate of accesses to the converter cache. The converter cache hit rate should be as close to 100% as possible. If necessary, the system parameter CONV_CACHE_PAGES (see Section Installing a New Serverdb for "configuration parameters") can be increased using the Configuration / Alter Parameters / Kernel menu function.