There is currently one ndbd error code associated with the LQH kernel block. This error code was added in MySQL Cluster NDB 7.0.34, MySQL Cluster NDB 7.1.23, and MySQL Cluster NDB 7.2.6, and is shown in the following table:

At the lowest level, an LCP comprises a series of fragment scans. Scans are requested by the DBDIH Master using an LCP_FRAG_ORD signal to the DBLQH kernel block. DBLQH then asks the BACKUP block to perform a scan of the fragment, recording the resulting data to disk. This scan is run through the DBLQH block. See also Section 8.4.7, “The DBLQH Block”.