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Compile-time metrics – HP Neoview Release 2.5 Software User Manual

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Description

Metric

Indicates the difference (current – previous interval samples) in
the number of rows inserted, updated, or deleted.

Delta IUD

Provides the rate of the number of rows inserted, updated, or deleted
per second.

IUD/Second

Compile-Time Metrics

Compile-time metrics are used by Neoview SQL to generate query plans and provides a view
of the estimates of resources required by a query. This information is static for the life of a query
(meaning it does not change while a query executes). Depending on the version of the platform
to which you are connected, the information displayed will vary. This document provides a short
description for the metrics:

Description

Metric

Indicates estimated cost of the query.

Estimated Cost

Indicates estimated number of rows returned back from the query.

Cardinality Estimate

Indicates estimated total amount of processor (CPU) time.

CPU Time Estimate

Indicates estimated total amount of IO time.

IO Time Estimate

Indicates estimated total amount of messaging time.

Msg Time Estimate

Indicates estimated idle time.

Idle Time Estimate

Total time estimate.

Estimated Total Time

Indicates estimated total number of rows that will be accessed from
the disk process by the Executor in the disk process (EID).

Rows Access Estimate

Indicates estimated total number of rows that will be used. This is the
compiler estimate of the number of rows that the Executor returns in
the disk process (EID) after applying the predicates.

Rows Usage Estimate

Indicates estimated total amount of memory.

Total Memory Estimate

Indicates estimated total resource usage.

Resource Usage Estimate

Compiler Affinity Number (indicates processors used).

Cmp Affinity Num

Degree of parallelism.

Compilation Degree Of Parallellism

Indicates whether a transaction is needed to run this query.

Cmp Txn Needed

Indicates whether there is a cross product. If TRUE, a mandatory cross
product is in the query. This means that the query has a logical cross
product that cannot be avoided by rearranging the join order.

Compilation Mandatory Cross Product

Indicates whether statistics are missing.

Cmp Missing Stats

Indicates the number of join operators required.

Cmp Num Joins

Indicates (TRUE) whether a full scan of the table is required. This is
indicative of the predicate not using a key-field to restrict the number
of records you need to search.

Cmp Full Scan On Table

Indicates high disk processor buffer usage.

Compilation_High_ESAM_Max_Buffer_Usage

Contains the

cardinality

of the largest table that is being scanned fully.

Although multiple tables might be fully scanned for a given query
plan, the counter simply shows the largest of them. If full table scans
are not required, field is empty or shows -1.

Cmp Rows Accessed Full Scan

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Neoview Workload Management Services (WMS) Configuration