The following table shows all Performance Schema tables relating
NDBCLUSTER storage engine.
Table 29.3 Performance Schema NDB Tables
Automatic synchronization in
attempts to detect and synchronize automatically all mismatches
in metadata between the NDB Cluster's internal dictionary
and the MySQL Server's datadictionary. This is done by
default in the background at regular intervals as determined by
system variable, unless disabled using
overridden by setting
Information about the current state of automatic synchronization is exposed by a MySQL server acting as an SQL node in an NDB Cluster in these two Performance Schema tables:
ndb_sync_pending_objects: Displays information about
NDBdatabase objects for which mismatches have been detected between the
NDBdictionary and the MySQL data dictionary. When attempting to synchronize such objects,
NDBremoves the object from the queue awaiting synchronization, and from this table, and tries to reconcile the mismatch. If synchronization of the object fails due to a temporary error, it is picked up and added back to the queue (and to this table) the next time
NDBperforms mismatch detection; if the attempts fails due a permanent error, the object is added to the
ndb_sync_excluded_objects: Shows information about
NDBdatabase objects for which automatic synchronization has failed due to permanent errors resulting from mismatches which cannot be reconciled without manual intervention; these objects are blocklisted and not considered again for mismatch detection until this has been done.
These tables are described in more detail in the following two sections.