In the database generation process, all dbspace and dbextent DASD space definitions are expressed in terms of 4-kilobyte pages: that is, each page represents 4096 bytes of storage space. Storage space is used not only for data, but also for indexes and free space initially reserved to facilitate the insertion of new data after the database is in operation.
Space needs are often expressed in terms of megabytes (1,048,576 bytes). Table 45 shows the number of 4-kilobyte pages needed to support a range of megabytes. The dbspace definitions are made in multiples of 128 pages. An alternative to using Table 45 is to use the formula:
Number of 4-kilobyte pages = 256 x number of megabytes
Table 45. Megabytes of Data on 4-Kilobyte Pages
| Megabytes | 4-Kilobyte Pages |
|---|---|
| 0.0 - 0.5 | 128 |
| 0.5 - 1.0 | 256 |
| 1.0 - 1.5 | 384 |
| 1.5 - 2.0 | 512 |
| 2.0 - 2.5 | 640 |
| 2.5 - 3.0 | 768 |
| 3.0 - 3.5 | 896 |
| 3.5 - 4.0 | 1,024 |
| 4.0 - 4.5 | 1,152 |
| 4.5 - 5.0 | 1,280 |
| 5.0 - 5.5 | 1,408 |
| 5.5 - 6.0 | 1,536 |
| 6.0 - 6.5 | 1,664 |
| 6.5 - 7.0 | 1,792 |
| 7.0 - 7.5 | 1,920 |
| 7.5 - 8.0 | 2,048 |
| 8.0 - 8.5 | 2,176 |
| 8.5 - 9.0 | 2,304 |
| 9.0 - 9.5 | 2,432 |
| 9.5 - 10.0 | 2,560 |
| 50.0 | 12,800 |
| 100.0 | 25,600 |
| 500.0 | 128,000 |