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Structure of pages Data page
U929-J-Z125-9-76 215
Dokuschablonen 19x24 Version 7.3us für FrameMaker V7.x vom 14.02.2007 © cognitas GmbH 2001-2007
18. Oktober 2007 Stand 11:29.50 Pfad: G:\vogt\fsc\uds\Manuale\en\udsent_e\udsent.k07
7.7 Data page
Depending on which page length was defined for the database, the length of a data page
may be 2048 bytes, 4000 bytes or 8096 bytes.
Data pages with a length of 2048 bytes differ from those consisting of 4000 or 8096 bytes
with respect to the lengths of entries for the database key value and the page index:
– In the case of data pages with a length of 2048 bytes, the entry for the database key
value is 4 bytes in length and that of the page index entry is 8 bytes.
– For data pages with a length of 4000 or 8096 bytes, the entry for the database key value
is 8 bytes in length and that of the page index entry is 12 bytes.
The following data may be placed in a data page:
– pointer arrays
–lists
– sort key tables
– SEARCH key tables
– records that are not stored in a hash area
The values given in the form “number1/number2“ (e.g. 25/29) in figure 53 must be inter-
preted as follows:
– “number1” indicates the applicable value for data pages with a length of 2048 bytes.
– “number2” indicates the applicable value for data pages with a length of 4000 or 8096
bytes.
All other length and displacement entries are equally applicable to data pages with a length
of 2048 bytes and those with a length of 4000 or 8096 bytes.