# reblock-ovf command

The reblock-ovf command forces contiguous
overflow blocks that exist in different internal tables to be compared
and combined if possible.

The overflow is split into a *safe* table, which
contains the largest available blocks, and the normal *B-tree* table which contains smaller blocks. After a crash, the safe table
is used to recover the overflow to a known state. Because of this
separation, it is sometimes possible to have blocks which appear to
be numerically contiguous, but which are not combined because they
exist in different tables. The reblock-ovf command
corrects this situation.

CAUTION: The reblock-ovf command locks the overflow table while running, and therefore, should
only be run at times of low system activity.

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Source: https://d3codex.com/tcl/reblock-ovf-command/ - part of the D3Codex reference.