![](/images/backgrounds/286310/hp-3par-system-reporter-e-media-kit-users-manual-156017326x1.png)
3PAR System Reporter User’s Guide | System Reporter 2.8 |
Table |
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Column | Type | Comment |
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d_rsize15 | DOUBLE PRECISION NOT | Difference between rsize15 value from last |
| NULL | sample for same object. |
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wrsize0 | DOUBLE PRECISION NOT | Number of writes in IO size bucket number |
| NULL | 0 (512 bytes). |
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|
|
d_wsize0 | DOUBLE PRECISION NOT | Difference between wsize0 value from last |
| NULL | sample for the same object. |
|
|
|
... | ... | ... |
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|
wsize15 | DOUBLE PRECISION NOT | Number of writes in IO size bucket number |
| NULL | 16 (16MiBytest). |
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|
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d_wsize15 | DOUBLE PRECISION NOT | Difference between wsize15 value from |
| NULL | last sample for same object. |
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|
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Although in principle it was not necessary to store the difference values (d_rcount for example), since these can be derived from previous samples of the same object, in practice having the difference values stored in the data tables greatly simplifies the queries and improves the performance of the queries. As described in the comment for the begin column in Table
10.34 The Sample Data and Inventory Tables