pl_trace_func_start

session: session level. The trace function is always enabled before the pl_trace_func_end function is called or the session is closed.
portal: portal level. The trace function is automatically disabled after a stored procedure is executed.
time: session level. The statement execution time is displayed at the session level.
threshold: session level. At the time level, only statements whose values are greater than or equal to the threshold are recorded.

Function for enabling the trace function of a node. For details about the column, see Table 1.

**Table 1** pl_trace_func_start
Parameter	Type	Description
session_id	bigint	ID of the session for which the trace function needs to be enabled.
node	text	Name of the node on which the trace function is to be enabled.
max_num	integer	Maximum number of messages that can be traced. The value ranges from 100 to 10000.
level	text	Trace level. session: session level. The trace function is always enabled before the pl_trace_func_end function is called or the session is closed. portal: portal level. The trace function is automatically disabled after a stored procedure is executed. time: session level. The statement execution time is displayed at the session level. threshold: session level. At the time level, only statements whose values are greater than or equal to the threshold are recorded.
threshold	float8	Threshold of the current trace, in milliseconds. This parameter is valid only when level is threshold.