Creating Tablespaces for OLAP

You should create undo, permanent, and temporary tablespaces that are appropriate for storing analytic workspaces. Tablespaces created using default parameters may use resources inefficiently. Use the SQL CREATE clauses listed in Table: SQL CREATE TABLESPACE Commands for OLAP.

Analytic workspaces are stored in the owner's default tablespace unless specified otherwise.

Table 1-1 SQL CREATE TABLESPACE Commands for OLAP

Tablespace	CREATE Command
Undo	`CREATE UNDO TABLESPACE...EXTENT MANAGEMENT LOCAL`
Permanent	`CREATE TABLESPACE... EXTENT MANAGEMENT LOCAL SEGMENT SPACE MANAGEMENT AUTO`
Temporary	`CREATE TEMPORARY TABLESPACE... EXTENT MANAGEMENT LOCAL UNIFORM SIZE` `n`

About OLAP Tablespaces

Each dimensional object occupies at least one extent in a permanent tablespace. A fixed extent size may waste most of the allocated space. For example, if an object is 64K and the extents are set to a uniform size of 1M (the default), then only a small portion of the extent is used.

Oracle OLAP uses the temporary tablespace to store all changes to the data in a cube, whether the changes are the result of a data load or data analysis. Saving the cube moves the changes into the permanent tablespace and clears the temporary tablespace. This usage creates numerous extents within the tablespace.

Creating an Undo Tablespace for OLAP

Suppose you want to create an undo tablespace for OLAP named OLAPUNDO.

To create an undo tablespace named OLAPUNDO:

Create the tablespace:

CREATE UNDO TABLESPACE olapundo DATAFILE '$ORACLE_BASE/oradata/undo.dbf'
     SIZE 64M REUSE AUTOEXTEND ON NEXT 8M
     MAXSIZE UNLIMITED EXTENT MANAGEMENT LOCAL;

Edit the system parameter file to include the following settings:
```
UNDO_TABLESPACE=OLAPUNDO
UNDO_MANAGEMENT=AUTO
```
Restart the database.

Creating a Permanent Tablespace for an Analytic Workspace

Suppose you want to create a permanent tablespace named GLO for the GLOBAL analytic workspace. You can make GLO the default tablespace for the GLOBAL owner, or you can override the default tablespace when creating the analytic workspace.

To create a permanent tablespace named GLO:

Create the tablespace:

CREATE TABLESPACE glo DATAFILE '$ORACLE_BASE/oradata/glo.dbf'
     SIZE 64M REUSE AUTOEXTEND ON NEXT 8M MAXSIZE UNLIMITED
     EXTENT MANAGEMENT LOCAL SEGMENT SPACE MANAGEMENT AUTO;

Assign GLO as the default tablespace for the GLOBAL user:

ALTER USER global DEFAULT TABLESPACE glo
     QUOTA UNLIMITED ON glo;

When creating the GLOBAL analytic workspace, select GLO as the tablespace if it is not the default.

Creating a Temporary Tablespace for an Analytic Workspace

Suppose you want to create a temporary tablespace named GLOTMP for the GLOBAL analytic workspace. GLOTMP must be the default temporary tablespace for the owner of the analytic workspace.

To create a temporary tablespace named GLOTMP:

Create the tablespace:

CREATE TEMPORARY TABLESPACE glotmp TEMPFILE '$ORACLE_BASE/oradata/glotmp.tmp'
     SIZE 50M REUSE AUTOEXTEND ON NEXT 5M MAXSIZE UNLIMITED
     EXTENT MANAGEMENT LOCAL UNIFORM SIZE 256K;

Assign GLOTMP as the default temporary tablespace for the GLOBAL user:
```
ALTER USER global TEMPORARY TABLESPACE glotmp;
```