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26.12.12.2 The ndb_sync_excluded_objects Table

This table provides information about NDB database objects which cannot be automatically synchronized between NDB Cluster's dictionary and the MySQL data dictionary.

Example information about NDB database objects which cannot be synchronized with the MySQL data dictionary:

mysql> SELECT * FROM performance_schema.ndb_sync_excluded_objects\G
*************************** 1. row ***************************
SCHEMA_NAME: NULL
       NAME: lg1
       TYPE: LOGFILE GROUP
     REASON: Injected failure
*************************** 2. row ***************************
SCHEMA_NAME: NULL
       NAME: ts1
       TYPE: TABLESPACE
     REASON: Injected failure
*************************** 3. row ***************************
SCHEMA_NAME: db1
       NAME: NULL
       TYPE: SCHEMA
     REASON: Injected failure
*************************** 4. row ***************************
SCHEMA_NAME: test
       NAME: t1
       TYPE: TABLE
     REASON: Injected failure
*************************** 5. row ***************************
SCHEMA_NAME: test
       NAME: t2
       TYPE: TABLE
     REASON: Injected failure
*************************** 6. row ***************************
SCHEMA_NAME: test
       NAME: t3
       TYPE: TABLE
     REASON: Injected failure

The ndb_sync_excluded_objects table has these columns:

  • SCHEMA_NAME: The name of the schema (database) in which the object which has failed to synchronize resides; this is NULL for tablespaces and log file groups

  • NAME: The name of the object which has failed to synchronize; this is NULL if the object is a schema

  • TYPE: The type of the object has failed to synchronize; this is one of LOGFILE GROUP, TABLESPACE, SCHEMA, or TABLE

  • REASON: The reason for exclusion (blocklisting) of the object; that is, the reason for the failure to synchronize this object

    Possible reasons include the following:

    • Injected failure

    • Failed to determine if object existed in NDB

    • Failed to determine if object existed in DD

    • Failed to drop object in DD

    • Failed to get undofiles assigned to logfile group

    • Failed to get object id and version

    • Failed to install object in DD

    • Failed to get datafiles assigned to tablespace

    • Failed to create schema

    • Failed to determine if object was a local table

    • Failed to invalidate table references

    • Failed to set database name of NDB object

    • Failed to get extra metadata of table

    • Failed to migrate table with extra metadata version 1

    • Failed to get object from DD

    • Definition of table has changed in NDB Dictionary

    • Failed to setup binlogging for table

    This list is not necessarily exhaustive, and is subject to change in future NDB releases.

The ndb_sync_excluded_objects table was added in NDB 8.0.21.