The threadblocks table associates data nodes, threads, and instances of NDB kernel blocks.
The threadblocks table contains the following columns:
node_id
Node ID
thr_no
Thread ID
block_name
Block name
block_instance
Block instance number
The value of the block_name in this table is one of the values found in the block_name column when selecting from the ndbinfo.blocks table. Although the list of possible values is static for a given NDB Cluster release, the list may vary between releases.
The block_instance column provides the kernel block instance number.