Operating the Natural Development Server

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# Operating the Natural Development Server

This document describes how to operate a Natural Development Server in a Com-plete on z/OS environment.

The following topics are covered:

- Starting the Natural Development Server

- Terminating the Natural Development Server

- Monitoring the Natural Development Server

- Runtime Trace Facility

- Trace Filter

## Starting the Natural Development Server

A prerequisite is a running Com-plete address space that is configured to run the Natural Development Server (see Development Server Installation).

Start the Natural Development Server with the Com-plete console command

    F name,NATRDEVS <server-id>

- where

`name` is the address space name assigned to the Com-plete region,

`server-id` is the name of your Natural Development Server.

#### Example:

    F COMPLETE,NATRDEVS NDVS1

Note
If you qualify the Natural Development Server datasets by server-id, the server ID is restricted to a maximum length of 6 characters.

Alternatively, you can automatically start Natural Development Servers during Com-plete initialization by using the Com-plete `SYSPARM` parameter `STARTUPPGM`. In the Com-plete `SYSPARM` file specify:

    STARTUPPGM='NATRDEVS <server-id>'

#### Example:

    STARTUPPGM='NATRDEVS NDVS1'

## Terminating the Natural Development Server

The Natural Development Server can be terminated from within the Monitor Client NATMOPI, see Monitor Commands.

Active Natural Sessions are canceled by issuing `cancel session` commands. If, at the time of the Natural Development server shutdown, no Natural session is active on that Natural Development server, then no `cancel session` command is issued.

Natural Development server only uses the `cancel session` command for sessions that are currently executing a Natural session (e.g. using Run As/Debug As) or using the Natural Command Console for Mainframes. It is only required for active Natural sessions that are not sitting on a terminal I/O. They must either be sitting on a wait inside Natural or looping.

## Monitoring the Natural Development Server

To enable the administrator to monitor the status of the Natural Development Server, a monitor task is provided which is initialized automatically at server startup. Using the monitor commands described below, the administrator can control the server activities, cancel particular user sessions, terminate the entire server, etc.

The following topics are covered below:

- Monitor Communication

- Monitor Commands

### Monitor Communication

To communicate with the monitor, you can use the monitor client `NATMOPI`; see Monitor Client NATMOPI.

Alternatively, you can use the operator command `MODIFY` to execute the monitor commands described below in the section Monitor Commands. The output of the executed monitor command will be written to the system log.

#### Example:

    F jobname,APPL=ping

sends the command `ping` to the NDV server running under the job `jobname`.

### Monitor Commands

The Natural Development Server supports the following monitor commands:

Monitor Command | Action
--- | ---
`ping` | Verifies whether the server is active. The server responds and sends the string
    I'm still up
`terminate` | Terminates the server.
`abort` | Terminates the server immediately without releasing any resources.
`set configvariable value` | With the `set` command, you can modify server configuration settings. For example, to modify `TRACE_LEVEL`:
    set TRACE_LEVEL 31+30+15
`list sessions` | Returns a list of active Natural sessions within the server. For each session, the server returns information about the user who owns the session, the session initialization time, the last activity time and an internal session identifier (`session-id`).
`list cputime` | Returns a list of transactions with highest CPU time usage, sorted by CPU time in descending order. See `CPU_TIME_HISTORY` and `CPU_TIME_TRACE` to enable CPU time history.
`cancel session session-id` | Cancels a specific Natural session within the Natural Development Server. To obtain the session ID, use the monitor command `list sessions`.
`cleanup` | Cancel sessions that are inactive longer than specified in configuration parameter `SESSION_TIMEOUT`. For more information on how to configure a Natural Development Server for SMARTS on z/VSE, see Single Point of Development > Natural Development Server for z/VSE > Natural Development Server for z/VSE (SMARTS/Com-plete) > Configuring the Natural Development Server.
`help` | Returns help information about the monitor commands supported.

## Runtime Trace Facility

For debugging purposes, the server code has a built-in trace facility which can be switched on, if desired.

The following topics are covered below:

- Trace Medium

- Trace Configuration

- Trace Level

### Trace Medium

A remote development server writes its runtime trace to Com-plete job output into the dataset `srvnameT`.

### Trace Configuration

The trace is configured by a trace level which defines the details of the trace. Once a trace is switched on, it can be restricted to particular clients or client requests by specifying a trace filter, see also NDV configuration parameter `TRACE_FILTER`.

Every Natural session is provided with a 32-bit trace status word (TSW) which defines the trace level for this session. The value of the TSW is set in the NDV configuration parameter `TRACE_LEVEL`. A value of zero means that the trace is switched off.

For more information on how to configure a Natural Development Server for SMARTS on z/VSE, see Single Point of Development > Natural Development Server for z/VSE > Natural Development Server for z/VSE (SMARTS/Com-plete) > Configuring the Natural Development Server.

### Trace Level

Each bit of the TSW is responsible for certain trace information. Starting with the rightmost bit:

Bit 31 | Trace main events (server initialization/termination, client request/result).
Bit 30 | Detailed functions (session allocation, rollin/rollout calls, detailed request processing).
Bit 29 | Dump internal storage areas.
Bit 28 | Session directory access.
Bit 27 | Dump request/reply PAL buffer.
Bit 26 | Free.
Bit 25 | Dump I/O buffer.
Bit 24 | Free.
Bit 23 | Request processing main events.
Bit 22 | Request processing detailed functions.
Bit 21 | Remote debugger main events.
Bit 20 | Remote debugger detailed functions.
Bit 19-16 | Free.
Bit 15 | Trace error situations only.
Bit 14 | Apply trace filter definitions.
Bit 13 | Trace start and termination of the server only.
Bit 12 | Trace start and termination of the client sessions only. Even if bit 13 is set.
Bit 11-08 | Free.
Bit 07-01 | Free.
Bit 00 | Reserved for trace-level extension.

## Trace Filter

It is possible to restrict the trace by a logical filter in order to reduce the volume of the server trace output.

- The filter can be set with the configuration parameter `TRACE_FILTER`.

- The filter may consist of multiple `keyword=filtervalue` assignments separated by spaces.

- To activate the filter definition, the trace bit 14 in the trace status word (see Trace Level) must be set.

The filter keyword is:

`Client` | Filters the trace output by specific clients.

The following rules apply:

- If a keyword is defined multiple times, the values are cumulated.

- The value must be enclosed in braces and can be a list of filter values separated by spaces.

- The values are not case sensitive.

- Asterisk notation is possible.

#### Example:

    TRACE_FILTER="Client=(KSP P*)"

Each request of the user ID `KSP` and each request of the user IDs starting with a `P` are traced.

### On this page

- Starting the Natural Development Server
- Terminating the Natural Development Server
- Monitoring the Natural Development Server
- Runtime Trace Facility
- Trace Filter