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A node of an operator tree is a point in the tree that represents an event (involving an operator)
in a plan. Each node might have subordinate nodes—that is, each event might generate a
subordinate event or events in the plan.
Column Name
MODULE_NAME
STATEMENT_ NAME
PLAN_ID
SEQ_NUM
OPERATOR
LEFT_CHILD_ SEQ_NUM
RIGHT_CHILD_ SEQ_NUM
TNAME
CARDINALITY
OPERATOR_COST
TOTAL_COST
DETAIL_COST
DESCRIPTION
The DETAIL_COST column of the EXPLAIN function results contains these cost factors:
CPU_TIME
IO_TIME
MSG_TIME
340
SQL Functions and Expressions
Data Type
CHAR(60)
CHAR(60)
LARGEINT
INT
CHAR(30)
INT
INT
CHAR(60)
REAL
REAL
REAL
VARCHAR (200)
VARCHAR (3000)
An estimate of the number of seconds of processor time it might take to execute the
instructions for this operator. A value of 1.0 is 1 second.
An estimate of the number of seconds of I/O time (seeks plus data transfer) to
perform the I/O for this operator.
An estimate of the number of seconds it takes for the messaging for this operator.
The estimate includes the time for the number of local and remote messages and
the amount of data sent.
Description
Reserved for future use.
Statement name; truncated on the right if longer than 60
characters.
Unique system-generated plan ID automatically assigned
by Neoview SQL; generated at compile time.
Sequence number of the current operator in the operator
tree; indicates the sequence in which the operator tree
is generated.
Current operator type. For a full list of valid operators,
see the Neoview Query Guide.
Sequence number for the first child operator of the
current operator; null if node has no child operators.
Sequence number for the second child operator of the
current operator; null if node does not have a second
child.
For operators in scan group, full name of base table,
truncated on the right if too long for column. If
correlation name differs from table name, simple
correlation name first and then table name in
parentheses.
Estimated number of rows that will be returned by the
current operator. Cardinality appears as
ROWS/REQUEST in some forms of EXPLAIN output.
For the right child of a nested join, multiply the
cardinality by the number of requests to get the total
number of rows produced by this operator.
Estimated cost associated with the current operator to
execute the operator.
Estimated cost associated with the current operator to
execute the operator, including the cost of all subtrees
in the operator tree.
Cost vector of five items, described in the next table.
Additional information about the operator. For a detailed
look at all operators, see the Neoview Query Guide.
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