Last Read Lines
This parameter is used to define the maximum number of lines in the "Last read" left list, when it is present in the object.
Level of localization / Global variable
This parameter is defined at the level User.It belongs to Chapter SUP (Supervisor) and the Group SEL (Lists and selections),The following parameters are also associated with this chapter and group :
- CHDERLUS (Load last read)
- GRPLIAISON (Link group)
- LFTBOX (Number of quickselect elements)
- LFTBOXTUN (Left list fill on tunnel)
- LIAISAUTO (Auto links)
- NBRCHOOSE (Default elements of selection)
- SELGLO (Global selection)
- SELRAPCAS (Case sensitive in rapid search)
The global variable GNBDERNIER is associated with it.
Linked parameters
The following parameters are linked to the parameter NBDERLUS :
Supervisor
NBRCHOOSE (defined at level User) : Default elements of selection
Functions concerned
All the functions likely to use selection lists of the last read are involved (that is to say all of the object functions).
Comments
It should be noted that in versions 130 and 120, this parameter is materialized by a field in the user record.
Performance optimization
The loading time of the lists (left lists, selection, last read) which, in some cases, is necessary for each access to an object, is proportional to the number of elements read, and it consumes resources, both at the level of the processing server and the data server.
In a situation where there is a large number of users, and moreover using complex filtering rules on the data, these queries can have a significant impact on the general perfomances of the system.
Since this parameter allows the number of lines read to be restricted, while still allowing the next lines to be read by means of a simple pagination, it is recommended to give this parameter a reasonable value (for instance, the content of a screen page), although it is possible, in some particular cases, to go well beyond (like several thousand lines).