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TIBCO iProcess® Engine 11.9.1

# SHMKEY_ID

WIS and WQS Process Configuration

Warning: TIBCO recommends that you do not change the value of this attribute unless you are instructed to do so by TIBCO Support, or you are fully familiar with the use of UNIX shared memory and the operation of the ftok system call.

## Summary

This attribute defines the UNIX shared memory key that is allocated (using the ftok system call) when the `WQS` process is started.

## Applies To

This attribute must be set for ALL processes.

## Default Value

This attribute is not defined on a newly installed iProcess Engine node. In this case, the default value is:

Machine ID | Process | Instance | Value
0 | ALL | 0 | “x”

The attribute only appears in the output of the `SHOW_ALL_ATTRIBUTES` command if you have explicitly assigned a value to it using the `SET_ATTRIBUTE` command. The default setting is not displayed

## Notes

The default value should work correctly in most situations. However, it is possible for a shared memory conflict to occur - for example, if iProcess Engine is restarted, another application may allocate to itself the shared memory key that iProcess expects to use when it restarts. If this happens, the `WQS` process will fail to start, and the following error message is written to the `sw_error` file:

    WQS initialise failed, connected to shared memory for nodename

where `nodename` is either a valid nodename or blank.

If such a shared memory conflict does occur you can change the `SHMKEY_ID` value to resolve it.

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