Reload Analyzer Manual

Tandem Reload Analyzer Manual Page 32 of 42
Data Chain Information
The Data Chain Information section is the most significant. This section shows the
number of data chains, a histogram of the chains, and the average blocks in each
chain. A data chain is the number of contiguous data blocks.
Example 2-5 shows the format of the Data Chain Information section.
Example 2-5. Data Chain Information Format
Number of chains num
Longest chain num
Chain length histogram
Histogram ranges num
Average blocks per chain num
% of total blocks in average chain num
Headers and variables that appear in Example 2-5 are:
Number of
chains
is the total number of data chains.
Longest
chain
is the number of data blocks in the longest chain. An
organized file will have one chain with a chain length equal to
the number of data blocks.
Chain length
histogram
shows the number of data chains and the length of those
chains. For example, the file SALESDB has 191 chains 1
block long. Nine chains have 2 to 10 data blocks in each
chain, and 3 chains have 11 to 25 blocks in each chain. The
histogram has six different ranges that show the length of a
chain.
Histogram
ranges
Reload Analyzer uses different histogram ranges, depending
on the size of the file you are analyzing. Table 2-1 shows the
value ranges used in a chain length histogram. If the file is
less than 100 MB, Reload Analyzer displays the data chains
using the ranges on the left side of Table 2-1. The right side of
Table 2-1 is the histogram range for the files greater than 100
MB. For example, with a file greater than 100 MB, Reload
Analyzer shows the number of chains that are 1 to 25 blocks
long, the number of chains that are 25 to 50 blocks long, the
number of chains that are 51 to 100 blocks long, and so forth.
Average
blocks per
chain
is the average number of data blocks in each chain. To
calculate the average blocks per chain, the total data blocks
are divided by the total number of data chains.
% of total
is the percentage of total blocks in the average chain. In an