This document covers the following topics:

• Adding a Dataspace

• Defining Basic Attributes of Dataspace - DB2 Mainframe

• Defining Basic Attributes of Dataspace - SQL/DS

• Defining Basic Attributes of Dataspace - DB2 Open Systems

For general information on how to manage objects (for example, how to add or copy an object), see the Predict Object Description documentation.

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Adding a Dataspace

When you add a dataspace, you first have to specify the dataspace type in the New Predict Object dialog box.

When you choose the OK button, a dataspace type-specific window appears. The dataspace type is indicated in the title bar.

Defining Basic Attributes of Dataspace - DB2 Mainframe

The following window applies to DB2 mainframe dataspaces.

Parameters
Tablespace name	Name of the table space in DB2.
Type	Table space type.
	S	Segmented.
	P	Partitioned.
	R	Range partitioned.
	G	Partition by growth.
	' '	Simple. This is the default setting.
Nr of partitions	Number of partitions used by the table space (corresponding to the NUMPARTS parameter, max. 4096) for table space type P or R. If 0 is specified, the table space is not partitioned. Maximum number of partitions used by the table space (corresponding to the MAXPARTITIONS parameter, max. 4096) for table space type G. Partitions can be defined Partitions can be defined explicitly or with default values (see Using/free clause below) if table space type is either P or R. Partition definitions are used when generating table spaces from Predict dataspace objects.
Large	Identifies a table space as large.
	Y	Yes.
	N	No.
Buffer pool	Name of the buffer pool to be associated with the table space.
Partition size	Only valid for partitioned tablespaces.
Locksize	Locking level for the table space. Valid values:
	A	Any level locking.
	P	Page level locking.
	R	Row level locking.
	S	Table space level locking.
	T	Table level locking (only valid for segmented DS).
Pages per segment	How many pages are to be assigned to each segment (parameter SEGSIZE) for table space type S, G or R. Pages per segment must be zero for table space type ' ' (Simple) or P.
Logged	blank	Not specified. This is the default setting.
	Y	Yes.
	N	No.
Pagenum	Specifies the type of page numbering that is used when you alter a partition-by-range table space.
	' '	None. This is the default setting.
	R	Relative.
	A	Absolute.
Insert algorithm	Specifies the algorithm that is used when rows are inserted into tables in this table space.
	' '	None. This is the default setting.
	1	Level 1.
	2	Level 2.
Close option	Y	The data sets which support the table space are closed when nobody is using the table space.
Lockmax	The maximum number of pages or row locks an application can hold simultaneously in the table space. Valid values:
	blank
	SYSTEM
	0 - 2,147,483,647.
	If parameter Locksize is set to S or T, Lockmax must be set to 0.
Lockpart	Partition locking. Valid values:
	blank	not specified.
	Y	Yes.
	N	No.
Maxrows	The maximum number of rows.
CCSID	Encoding scheme. Valid values:
	blank	not specified.
	A	ASCII.
	E	EBCDIC.
	U	Unicode.
Member cluster	Specifies that data inserted by the INSERT statement is not clustered by the implicit clustering index (the first index) or the explicit clustering index. Instead, DB2 chooses where to locate the data in the table space based on available space. Valid values:
	blank	not specified.
	Y	Yes.
	N	No.

Definition of Using/Free Clause

The values specified in the Definition of using/free clause tab are used as default values.

Parameters
VSAM catalog name	Name of the VSAM catalog containing an entry for the data sets of the table space. Must not be specified if the parameter Storagespace is specified.
Storagespace	Name of the storagespace for the table space documented with the Predict Dataspace object. Must not be specified if the parameter VSAM catalog is specified.
Primary attributes
Free pages	How often pages are to be left free when loading or reorganizing table spaces or partitions. Max. value is 255. Default is 0, leaving no free pages.
Percentage free	Percentage of each page to be left free. Equivalent in DB2 is the PCTFREE option.
for update	Percentage of each page that is reserved to be used only by future update operations. Equivalent in DB2 is the PCTFREE FOR UPDATE option. When you specify -1, DB2 uses real-time statistics to automatically calculate how much free space to reserve for updates. This is the default.
Compress option	Specifies whether data compression applies to the rows of the implicitly created tablespace. blank Not specified. This is the default setting. N No. Y Yes. F FIXEDLENGTH. H HUFFMAN.
GBPCACHE	Only relevant in a data sharing environment. Specifies what pages of the table space or partition are written to the group buffer pool. Leave this field blank or enter: C Changed. Only pages that have been changed are written to the group buffer pool. A All pages are written. N No pages are written to the group buffer pool.
TRACKMOD	Specifies whether DB2 tracks changed pages in the space map pages. Y Changed pages are tracked in the space map pages. N Changed pages are not tracked.
Additional for storagespace
Primary allocation	Primary space allocation for DB2 defined data sets.
Secondary allocation	Secondary space allocation for DB2 defined data sets.
Erase option	Determines if DB2 defined data sets are to be erased when the table space is dropped: N Do not erase data sets (default). Y Erase data sets.

Defining Partitions

Each individual partition can be defined in the Definition of partitioned dataspace tab. The maximum number of partitions is 4096.

To define a new partition, use the New button. When you have defined more than one partition, a scroll bar is available. To go to a specific partition, use the scroll bar. To delete the currently displayed partition, choose the Delete button.

Parameters
DSSIZE	Specifies the maximum size (in Gbyte) for each partition of a partitioned index.
For all other values/options see previous table above for a description of the parameters.

Defining Basic Attributes of Dataspace - SQL/DS

The following window applies to SQL/DS dataspaces.

Parameters
Tablespace name	Identifier of the table space and name of the DBspace in SQL/DS.
Private dataspace	Y SQL/DS DBspace is private. N Dataspace is public.
Size for header	Number of 4096-byte logical pages reserved for header.
Size for dataspace	Size reserved for the dataspace.
Percentage for indices	Percentage of the reserved space that can be used for indexes.
Percentage free	Percentage of reserved space to be kept free.
Locksize	Locking level for the dataspace. Valid values: A Any level locking P page S dbspace R row T table
Storage pool number	Storage pool number. This parameter tells SQL/DS to acquire the dbspace from a specified storage pool.

Defining Basic Attributes of Dataspace - DB2 Open Systems

The following window applies to DB2 open systems dataspaces.

Parameters
Tablespace name	Name of the tablespace in DB2.
Storagespace	Name of the storagespace for the tablespace documented with the Predict dataspace object.
Data type	Valid data types: R Regular L Large U User temporary S System temporary blank not specified
Page size	Defines the size of pages used for the tablespace. Valid values: 4K, 8K, 16K, 32K, 4096, 8192, 16384, 32768 or not specified.
Space type	Specifies how the tablespace is to be managed: S System managed D Database managed
Extent size	Specifies the number of PAGESIZE pages that will be written to a container before skipping to the next container. Valid values are 0 or integer or integer with unit K, M or G.
Prefetch size	Specifies the number of PAGESIZE pages that will be written to a container before skipping to the next container. Valid values are 0 or integer or integer with unit K, M or G.
Buffer pool	Name of the buffer pool to be associated with the tablespace.
Overhead	Specifies the I/O controller overhead and disk seek and latency time (in milliseconds).
Transfer rate	Specifies the time to read one page into memory (in milliseconds).
Dropped table	Specifies if dropped tables in the tablespace may be recovered. Valid values: Y Yes N No blank Not specified

Container Definitions

The following window applies when defining containers.

Parameters
Container number (1, 2, etc.)	Specifies the container for a tablespace. Choose Add to enter a new container. Use the scrollbar to select an existing container (only applicable if more than one container exists).
Partition numbers	Specifies the partition numbers on which the container is created in a partitioned database.