Abstract
This section discusses the LogfileGroup class,
which represents a MySQL Cluster Disk Data logfile group.
Parent class.
NdbDictionary
Child classes. None
Description. This class represents a MySQL Cluster Disk Data logfile group, which is used for storing Disk Data undofiles. For general information about logfile groups and undofiles, see MySQL Cluster Disk Data Tables, in the MySQL Manual.
Currently, only unindexed column data can be stored on disk. Indexes and indexes columns continue to be stored in memory as with previous versions of MySQL Cluster.
MySQL Cluster prior to MySQL 5.1 does not support Disk Data
storage, and so does not support logfile groups; thus the
LogfileGroup class is unavailable for NDB API
applications written against such releases.
Methods. The following table lists the public methods of this class and the purpose or use of each method:
| Method | Purpose / Use |
|---|---|
LogfileGroup() |
Class constructor |
~LogfileGroup() |
Virtual destructor |
getAutoGrowSpecification() |
Gets the logfile group's
AutoGrowSpecification
values |
getName() |
Retrieves the logfile group's name |
getObjectId() |
Get the object ID of the logfile group |
getObjectStatus() |
Gets the logfile group's object status value |
getObjectVersion() |
Retrieves the logfile group's object version |
getUndoBufferSize() |
Gets the size of the logfile group's UNDO buffer |
getUndoFreeWords() |
Retrieves the amount of free space in the UNDO buffer |
setAutoGrowSpecification() |
Sets AutoGrowSpecification values for
the logfile group |
setName() |
Sets the name of the logfile group |
setUndoBufferSize() |
Sets the size of the logfile group's UNDO buffer. |
For detailed descriptions, signatures, and examples of use for each
of these methods, see Section 2.3.11.1, “LogfileGroup Methods”.
Types.
The LogfileGroup class does not itself define
any public types. However, two of its methods make use of the
AutoGrowSpecification data
structure as a parameter or return value. For more information,
see Section 2.3.1, “The AutoGrowSpecification Structure”.
Class diagram.
This diagram shows all the available public methods of the
LogfileGroup class:
