25.6.16.23 The ndbinfo dictionary_tables Table

This table provides NDB dictionary information for NDB tables. dictionary_tables contains the columns listed here:

• table_id

  The table' unique ID

• database_name

  Name of the database containing the table

• table_name

  Name of the table

• status

  The table status; one of New, Changed, Retrieved, Invalid, or Altered. (See Object::Status, for more information about object status values.)

• attributes

  Number of table attributes

• primary_key_cols

  Number of columns in the table's primary key

• primary_key

  A comma-separated list of the columns in the table's primary key

• storage

  Type of storage used by the table; one of memory, disk, or default

• logging

  Whether logging is enabled for this table

• dynamic

  1 if the table is dynamic, otherwise 0; the table is considered dynamic if table->getForceVarPart() is true, or if at least one table column is dynamic

• read_backup

  1 if read from any replica (READ_BACKUP option is enabled for this table, otherwise 0; see Section 15.1.20.12, “Setting NDB Comment Options”)

• fully_replicated

  1 if FULLY_REPLICATED is enabled for this table (each data node in the cluster has a complete copy of the table), 0 if not; see Section 15.1.20.12, “Setting NDB Comment Options”

• checksum

  If this table uses a checksum, the value in this column is 1; if not, it is 0

• row_size

  The amount of data, in bytes that can be stored in one row, not including any blob data stored separately in blob tables; see Table::getRowSizeInBytes(), in the API documentation, for more information

• min_rows

  Minimum number of rows, as used for calculating partitions; see Table::getMinRows(), in the API documentation, for more information

• max_rows

  Maximum number of rows, as used for calculating partitions; see Table::getMaxRows(), in the API documentation, for more information

• tablespace

  ID of the tablespace to which the table belongs, if any; this is 0, if the table does not use data on disk

• fragment_type

  The table's fragment type; one of Single, AllSmall, AllMedium, AllLarge, DistrKeyHash, DistrKeyLin, UserDefined, unused, or HashMapPartition; for more information, see Object::FragmentType, in the NDB API documentation

• hash_map

  The hash map used by the table

• fragments

  Number of table fragments

• partitions

  Number of partitions used by the table

• partition_balance

  Type of partition balance used, if any; one of FOR_RP_BY_NODE, FOR_RA_BY_NODE, FOR_RP_BY_LDM, FOR_RA_BY_LDM, FOR_RA_BY_LDM_X_2, FOR_RA_BY_LDM_X_3, or FOR_RA_BY_LDM_X_4; see Section 15.1.20.12, “Setting NDB Comment Options”

• contains_GCI

  1 if the table includes a global checkpoint index, otherwise 0

• single_user_mode

  Type of access allowed to the table when single user mode is in effect; one of locked, read_only, or read_write; these are equivalent to the values SingleUserModeLocked, SingleUserModeReadOnly, and SingleUserModeReadWrite, respectively, of the Table::SingleUserMode type in the NDB API

• force_var_part

  This is 1 if table->getForceVarPart() is true for this table, and 0 if it is not

• GCI_bits

  Used in testing

• author_bits

  Used in testing

The dictionary_tables table was added in NDB 8.0.29.