IBM 000-8697 Uživatelský manuál stáhnout pdf (Strana 447)

How to Improve Performance 5-7

Blobpage Average Fullness

The example output indicates that four blobs are stored as part of the table

sriram.catalog. Two blobs are stored in the blobspace blobPIC in 6144-byte

blobpages. Two more blobs are stored in the blobspace bspc1 in 2048-byte

blobpages.

The summary information that appears at the top of the display, Total

pages used by table

, is a simple total of the blobpages needed to store

blobs. The total says nothing about the size of the blobpages used, the

number of blobs stored, or the total number of bytes stored.

The efﬁciency information displayed under the Percent Full heading is

imprecise, but it can alert an administrator to trends in blob storage. To

understand how the fullness statistics can improve your blob storage

strategy, it is helpful to use the example in Figure 5-1 to explain the idea of

average fullness.

Blobpage Average Fullness

The ﬁrst blob listed in Figure 5-1 is stored in blobPIC and requires one 6144-

byte blobpage. The blobpage is 51 to 75 percent full, meaning that the

minimum blob size must be greater than 50 percent of 6144 bytes, or 3072

bytes.Themaximumsize of this blob mustbelessthan or equal to 75 percent

of 6144 bytes, or 4508 bytes.

The second blob listed under blobspace blobPIC requires two 6144-byte

blobpages for storage, or a total of 12,288 bytes. The average fullness of all

allocated blobpages is 51 to 75 percent. Therefore, the minimum size of the

blob must be greater than 50 percent of 12,288 bytes, or 6144 bytes. The

maximum size of the blob must be less than or equal to 75 percent of 12,288

bytes, or 9216 bytes. Notice that average fullness does not mean that each

page is 51 to 75 percent full. A calculation would yield 51 to 75 percent

average fullness for two blobpages where the ﬁrst blobpage is 100 percent

full and the second blobpage is 2 percent full.

Next, consider the two blobs in blobspace bspc1. These two blobs appear to

be nearly the same size.Both blobs require two 2048-byte blobpages and the

average fullness for each is 76 to 100 percent. The minimum size for these

blobs must be greater than 75 percent of the allocated blobpages, or 3072

bytes. The maximum size for each blob is slightly less than 4096 bytes

(allowing for overhead).

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