Abstract
The section discusses the Undofile class and
its public methods.
Parent class.
NdbDictionary
Child classes. None
Description.
The Undofile class models a MySQL Cluster Disk
Data undofile, which stores data used for rolling back
transactions.
Currently, only unindexed column data can be stored on disk. Indexes and indexes columns are always stored in memory.
MySQL Cluster prior to MySQL 5.1 does not support Disk Data
storage, and so does not support undo files; thus the
Undofile class is unavailable for NDB API
applications written against these older releases.
Methods. The following table lists the public methods of this class and the purpose or use of each method:
| Method | Purpose / Use |
|---|---|
Undofile() |
Class constructor |
~Undofile() |
Virtual destructor |
getFileNo() |
Gets the number of the undo file in the log file group |
getLogfileGroup() |
Gets the name of the log file group to which the undo file belongs |
getLogfileGroupId() |
Gets the ID of the log file group to which the undo file belongs |
getNode() |
Gets the node where the undo file is located |
getObjectId() |
Gets the undo file's object ID |
getObjectStatus() |
Gets the undo file's Status
|
getObjectVersion() |
Gets the undo file's object version |
getPath() |
Gets the undo file's file system path |
getSize() |
Gets the size of the undo file |
setLogfileGroup() |
Sets the undo file's log file group using the name of the log file group
or a reference to the corresponding
LogfileGroup object |
setNode() |
Sets the node on which the undo file is located |
setPath() |
Sets the file system path for the undo file |
setSize() |
Sets the undo file's size |
For detailed descriptions, signatures, and examples of use for each
of these methods, see Section 2.3.37.1, “Undofile Methods”.
Types.
The undo file class defines no public types.
Class diagram.
This diagram shows all the available methods of the
Undofile class:
