Oracle® Essbase

New Features

Release 11.1.2.2


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Authors: EPM Information Development Team

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Table of Contents:

Block Storage Performance Enhancements

Optimization of Distinct Count Calculations on Aggregate Storage Databases

Distinct Way to Reference Shared Members in MDX

Changing Essbase Server and Application Log Levels in Administration Services

MDX Property Expressions

Throttle Active Transactions

Essbase API Changes

Configuration Setting (essbase.cfg) Changes

SET CALCPARALLEL Calculation Command Enhancement

New MDX Functions

MaxL Grammar Changes

This document describes the new features in Oracle Essbase Release 11.1.2.2. For detailed information on these features, see the Oracle Essbase Database Administrator's Guide, Oracle Essbase Technical Reference, and Oracle Essbase API Reference.

For information about the new features in Oracle Essbase Administration Services, see Oracle Essbase Administration Services New Features.

Block Storage Parallel Calculation

Calculation tasks are generated along the last n sparse dimensions of an outline. These sparse dimensions used to identify tasks are called task dimensions. The number of task dimensions, n, is either selected dynamically by Essbase, or you can override the number by specifying a value for CALCTASKDIMS in the essbase.cfg file.

Block Storage Parallel Restructuring

By default, block storage restructuring is performed sequentially. Blocks are renumbered and reshaped from first to last, a time-intensive process. Parallel restructuring can reduce restructuring time by dividing block restructuring work across multiple concurrent threads to use available processor cores. Because calculation is performed separately from restructuring, each block can be restructured independently of other blocks.

The number of restructuring threads to use is defined in essbase.cfg using the RESTRUCTURETHREADS configuration setting.

Block Storage Parallel Data Export

Using the export data MaxL statement to export data from a block storage database in parallel, you specify a comma-separated list of export files, up to a maximum of 1024 file names. The number of file names determines the number of export threads. The number of available block-address ranges limits the number of export threads that Essbase actually uses. Essbase divides the number of actual data blocks by the specified number of file names (export threads). If there are fewer actual data blocks than the specified number of export threads, the number of export threads that are created is based on the number of actual data blocks. This approach results in a more even distribution of data blocks between export threads.

Note:

In specifying the number of export files, it is important to consider the number of available CPU cores and I/O bandwidth on the computer on which Essbase Server runs. Specifying too large a number can result in poor performance.

The EXPORTTHREADS configuration setting has been enhanced to support block storage parallel data export. (EXPORTTHREADS is used only when executing the PAREXPORT ESSCMD command without specifying the -threads option.)

Block Storage Parallel Data Load

Parallel data load refers to the concurrent loading of multiple data files into an Essbase database. When working with large data sets (for example, a set of ten 2 GB files), loading the data sources concurrently enables you to fully utilize the CPU resources and I/O channels of modern servers with multiple processors and high-performance storage subsystems.

Parallel data load uses multiple parallel pipelines on the server side, and multiple threads on the client-side, to load multiple data files concurrently, thus enabling data loads to be truly optimized to the capabilities of modern servers.

Optimizing Block Storage Parallel Data Load

Parallel data load includes a “throttle” to limit the number of client threads or server pipelines that are used. A throttle control is important because if the data-file specification matches several hundred files, you should avoid spawning that many threads or pipelines. To control the number of threads or pipelines spawned by a data load request, set the limit using the max_threads grammar in the import data MaxL statement.

Cache Sizes Larger than 4 GB

The 64-bit Essbase Server has been expanded to accommodate larger index, data, and data file cache sizes without setting a scaling factor. The MEMSCALINGFACTOR configuration setting is deprecated. For full database functionality, you must upgrade to the latest client software.

For more information, see the Essbase Readme for this release.

Optimization of Distinct Count Calculations on Aggregate Storage Databases

On aggregate storage databases only, the NonEmptyCount MDX function is optimized so that the calculation of the distinct count for all cells can be performed by scanning the database only once. Without this optimization, the database is scanned as many times as the number of cells corresponding to the distinct count. The NonEmptyCount optimization is triggered when an outline member formula has the following syntax:

NONEMPTYCOUNT(set, measure, exclude_missing)

The exclude_missing parameter supports the NonEmptyCount optimization on aggregate databases by improving the performance of a query that queries metrics that perform a distinct count calculation.

Distinct Way to Reference Shared Members in MDX

In an outline that is enabled for duplicate member names, all member names, including shared members, are distinguishable by using a qualified member name syntax. However, in a unique member name outline (where duplicate members are not enabled), a member and its shared member are both identified by the same simple member name.

In previous releases, any reference in an MDX query to such a shared member was assumed to be a reference to the original member, not the shared member. With this release, you can get a unique name for shared members by using the MEMBER_UNIQUE_NAME property in an MDX query.

For example, in the Sample Basic database, the member [100-20] is an original member under parent [100], and has a shared member associated with it under parent [Diet]. The shared member [100-20] can be referred to explicitly, using the unique name [Diet].[100-20], as shown in the following query:

SELECT
 {Sales} 
ON COLUMNS,
 {[[Diet]].[100-20]]]} PROPERTIES MEMBER_UNIQUE_NAME
ON ROWS
FROM Sample.Basic; 

For rules on the syntax and escape characters required to uniquely reference shared members in a unique member name outline, see the topic entitled “MDX Syntax for Specifying Duplicate Member Names and Aliases” in the Oracle Essbase Technical Reference.

Changing Essbase Server and Application Log Levels in Administration Services

You can change Essbase log levels at the server and application level in Administration Services Console. See “Changing Log Levels” in the Oracle Essbase Administration Services Online Help.

MDX Property Expressions

In addition to querying for intrinsic and custom properties of a particular member, you can also query for properties of related members, using the PROPERTY_EXPR function within the DIMENSION PROPERTIES section of the query axis.

See the MDX Property Expressions topic and the CurrentAxisMember topic in the Oracle Essbase Technical Reference

Throttle Active Transactions

Each allotted server thread for an application may create child threads for tasks such as parallel calculation, parallel data load or export, and parallel restructuring. However, if the total number of running threads is too high, threads may lose efficiency while contending for server resources. To control the issue of thread contention, you can use the MAXTOTALACTIVETRANSACTIONS and MAXACTIVEUPDATETRANSACTIONS essbase.cfg settings.

Changed C Main API Structures

The data structures ESS_DBINFO_T and ESS_DBSTATE_T have expanded fields to accommodate 64-bit long typedefs. This is related to Cache Sizes Larger than 4 GB.

Compiler Support

The supported compilers list for building Essbase API programs has been updated. See the “Supported Compilers” topic in the Oracle Essbase API Reference.

New Configuration Settings

  • MAXACTIVEUPDATETRANSACTIONS. See Throttle Active Transactions.

  • MAXTOTALACTIVETRANSACTIONS. See Throttle Active Transactions.

  • NUMBLOCKSTOEXTEND: Determines the number of bytes by which data files in block storage databases are extended to accommodate block updates that require additional disk space.

  • RESTRUCTURETHREADS: Specifies whether parallel restructuring is enabled for a database, and the number of threads to use.

  • XOLAPMAXINCLAUSESIZE: Sets the maximum number of INLIST items allowed in SQL clauses (for XOLAP databases).

Deprecated Configuration Setting

The MEMSCALINGFACTOR configuration setting is deprecated. The 64-bit Essbase Server has been expanded to accommodate larger cache sizes without setting a scaling factor.

CALCPARALLEL Configuration Setting Enhancement

The maximum number of threads that can be made available for parallel calculation has been increased:

  • Block storage databases:

    • Running on 32-bit platforms: 64

    • Running on 64-bit platforms: 128

  • Aggregate storage databases (running on 32-bit or 64-bit platforms): 128

SET CALCPARALLEL Calculation Command Enhancement

The maximum number of threads that can be made available for parallel calculation has been increased:

  • 32-bit platforms: 64

  • 64-bit platforms: 128

New MDX Functions

  • PROPERTY_EXPR function (MDX Property Expressions), for querying properties of ancestor members.

  • CurrentAxisMember, for use with the PROPERTY_EXPR function.

MaxL Grammar Changes

  • The query database MaxL statement for aggregate storage databases has a new list aggregate_storage slice_info clause, to display information about data slices and views.

  • The deploy MaxL statement for deploying cubes from Oracle Essbase Studio has the following new grammar:

    • If an Oracle Essbase model is enabled for XOLAP, you can, when redeploying the cube, use the outline_in_background grammar.

    • When the model being deployed contains single or multiple relational data sources, you can deploy in streaming mode using the use streaming build grammar if you want Oracle Essbase Studio to the query the external data source directly (rather than using an ODBC connection).

  • The import data MaxL statement has a new using max_threads clause, for specifying maximum number of threads to use for a parallel data load.

  • The alter system and alter application MaxL statements have new set ... message_level clauses, to set the message logging level at the agent and application scopes.

  • The display system and display application MaxL statements have new message_level clauses, to display the current message level settings.