BTSCANNER

syntax

BTSCANNER [num=scanner_threads,][priority=low|high,]
[threshold=committed_deleted],[rangesize=size]

onconfig.std value

none

range of values

scanner_threads

The number of B-tree scanner threads to start. Must be an integer between 1 and 32, inclusive. The default is 1.

committed_deleted

The minimum number of committed deleted items an index must encounter before adding the index to the hot list as a candidate for cleaning. Must be an integer greater than 0. The default is 500.

takes effect

When the database server is initialized. You can adjust these B-tree scanner settings with the onmode -C command while the database server is online.

additional information

See Control the B-tree Scanner.

After all indexes above the threshold are cleaned, indexes below the threshold are added to the hot list. The default threshold is 500.

The priority=high option sets the priority of the B-tree scanner threads to equal that of normal users. The priority=low option sets the priority of the B-tree scanner threads lower than that of normal users. This command allows the B-tree scanner to consume only spare system resources, ensuring that the threads will not use the CPU cycles of normal users. The default priority is low.