ADJUST TABLE CACHE PRIORITY

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4D v20 R7


ADJUST TABLE CACHE PRIORITY ( aTable ; priority )

Parameter	Type	Description
aTable	Table	Table whose scalar data priority value has to be adjusted
priority	Longint	Cache priority value for the table

Expert mode

This command is reserved for specific needs. It must be used with care since it can affect database performance.

The ADJUST TABLE CACHE PRIORITY command modifies the priority value of the data related to aTable in cache for the current process. A call to this command replaces any priority value previously adjusted through the same command in the same process. This command adjusts the priority for a temporary need, for example during a query or an import.

Note: This command only works in local mode (4D Server and 4D); it cannot be used in 4D remote mode.

This command handles priority for data in scalar fields only (date, number, or string types). Priority for fields of binary type (Blobs, texts, pictures, and objects) is handled by the ADJUST BLOBS CACHE PRIORITY command.

In the priority parameter, pass one of the following constants from the "Cache Management" theme:

Constant	Comment
Cache priority low
Cache priority very low
Cache priority normal	Sets the cache priority to its default value
Cache priority high
Cache priority very high

Example

You want to temporarily change the cache priority for the [Docs] scalar fields:

 ADJUST TABLE CACHE PRIORITY([Docs];Cache priority low)

  // ... do some specific operation

 ADJUST TABLE CACHE PRIORITY([Docs];Cache priority normal)