print tablesize

You can use the print tablesize command to view a list of the maximum values for your device. The four columns of values provide the following information, respectively:

1. Maximum number of variables allowed for this object type
2. Maximum number of objects of this type allowed per virtual domain (VDOM)
3. System global limit for maximum number of objects of this type
4. Current total number of objects of this type existing in FortiOS

A value of 0 indicates that there is no maximum value limit.

To check the maximum number of variables that you can append to all log messages:

# print tablesize
...
log.setting:custom-log-fields: 5 0 0 0
...

This means that you can add up to five variables:

config log setting
    set custom-log-fields <field_1>  <field_2>  <field_3>  <field_4>  <field_5>
end

To check the external resource table size limit for your device:

In this example, the device has a global limit of 512, a per-VDOM limit of 256, and there are currently no external resources existing in FortiOS. the available memory on the device limits the total number of feeds.

# print tablesize
...
system.external-resource: 0 256 512 0
...

To check the current total number of objects of this type existing in FortiOS:

# print tablesize
system.vdom: 0 0 10 3
system.datasource: 0 0 0 3
system.timezone: 0 0 0 597
system.accprofile: 0 0 10 5
system.np6xlite: 0 256 512 1
system.vdom-link: 0 0 0 3
...