Parallel query tree

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Parallel Query Tree provides the function to analyze the trend of parallel queries per day. The slave processes that perform actual tasks and the coordinator processes that assign tasks to them are distinguished, and overall executions are displayed in an easy-to-understand manner. It can help determine what purpose it was used for by providing information about parallel queries performed at a specific time point.

Basic screen guide

Set the time to view in the Time item, and then select the instance to view parallel query information in the Instance item.

You can check the trend of parallel queries that meet the set conditions through a graph chart, and the structure of coordinators and slaves is represented in the form of tree.

Column information guide

For more information about columns, see the link.

Item	Description
sid	Session ID
cpu(xos)	CPU utilization collected by the installed XOS
serial#	Value to increment to determine if the same session ID has been used.
username	DB user name.
command	Same as COMMAND_TYPE; SQL command number
status	Session status
schemaname	Schema. Same as the username.
osuser	Username of the OS that accessed the session.
spid	OS process ID.
process	ID of the client process that accessed the session.
logon_time	Session created time point.
last_call_et	If the session is active, it is the elapsed time (sec) since activation.
sql_text	query, running statement, SQL statement that separates literal strings
sql_param	Literal value separated from query
prev_sql_text	Previously executed query
prev_sql_param	Previously executed query param
program	Program information executed by client
type	session type - can be adjusted in user background recursive (whatap.conf).
seq#	Number that uniquely identifies the current or last wait (incremented with each wait)
event	Number of the resource or event if the session is waiting.
p1	First waiting event parameter (decimal point)
p2	Second waiting event parameter (decimal point)
p3	Third waiting event parameter (decimal point)
wait_class	Class name of the waiting event
wait_time	The value is 0 if the session is waiting. It is the last waiting time (milliseconds) if the value is greater than 0.
seconds_in_wait	Time spent waiting for the wait if the session is waiting. Otherwise, it is the time elapsed since the last waiting.
state	Waiting state: WAITING, WAITED UNKNOWN TIME, WAITED SHORT TIME, WAITED KNOWN TIME
machine	Name of the client server that accessed the session (hostname)
port	Clinet port number
terminal	Client terminal name
module	Name of the module set by the user of the program executed on the client.
action	Action name set by the user of the running module.
client_info	Client information set by user
client_identifier	Client ID set by user
session logical reads	Number of times data was read into the buffer cache
physical reads	Number of data reads from the physical disk
execute count	SQL execution count
parse count (hard)	Total number of syntax analysis calls (actual syntax analysis)
parse count (total)	Total number of syntax analysis calls (hard, soft, describe)
opened cursors current	Number of open cursors
db block changes	Change count of all blocks in the database
session pga memory	Session's current PGA size
undo_segid	Undo information ID
undo_blk	Undo block count
undo_rec	Undo record count
sql_address	SQL statement identification data
sql_hash_value	SQL statement identification data
sql_id	SQL ID of the running SQL statement
sql_child_number	Sub number of the running SQL statement
sql_exec_start	Start time point of SQL running in the session
sql_exec_id	SQL running ID
prev_sql_addr	Information that identifies the last run SQL statement
prev_child_number	Sub number of the last SQL statement executed
prev_exec_start	Start time point of the last SQL statement executed
prev_exec_id	Start ID of the last SQL statement executed
plsql_entry_object_id	Object ID of the top PL/SQL subprogram on the stack.
plsql_entry_subprogram_id	ID of the top PL/SQL subprogram on the stack.
plsql_object_id	Subprogram ID of the running PL/SQL object
taddr	Transaction address
lockwait	lock wait address (lock address where the session is waiting)
row_wait_obj	Object ID of the table containing the row specified in ROW_WAIT_ROW#
row_wait_file	ID of the data file containing the row specified in ROW_WAIT_ROW#
row_wait_block	ID of the block containing the row specified in ROW_WAIT_ROW#
row_wait_row	Currently locked row
pdml_status	If the value is ENABLED, the session is in PARALLEL DML activation mode. If the value is DISABLED, the session does not support the PARALLEL DML activation mode. If the value is DISABLED, the session does not support the PARALLEL DML activation mode.
pq_status	If the value is ENABLED, the session is in PARALLEL QUERY activation mode. If the value is DISABLE, the session does not support the PARALLEL QUERY activation mode. If the value is FORCED, it indicates the session was changed to force the use of PARALLEL QUERY.
blocking_session_status	It provides details about whether there is a blocking session.
blocking_instance	Instance ID for the blocking session
blocking_session	Session ID for the blocking session
final_blocking_session_status	It provides details about whether there is a last block session.
final_blocking_instance	Instance ID for the last blocking session
final_blocking_session	Session ID for the last blocking session
service_name	Service name of the session. It is similar to the DB name.
saddr	Session address
con_id	ID of the container associated with the data (only for multi-database support)
rss(xos)	OS metrics collected by the XOS agent
pss(xos)	OS metrics collected by the XOS agent
ioread(xos)	OS metrics collected by the XOS agent
iowrite(xos)	OS metrics collected by the XOS agent

Note

WhaTap basically stores the client-related information.