EDOBE XDOM PMML Bedienerhandbuch PDF herunterladen (Seite 18)

Known Issues in Release 2.0

The following are known issues in Release 2.0. Those references numbers shown in red

have been fixed in a later patch release.

Reference Topic/Area Issue Description / Workaround

Netezza Matrix

Engine

Using CTRL-C in nzsql typically aborts and rolls back the trans-

action in progress. However, it is possible that the Matrix Engine

processes continue running and consuming resources. To check

if any Matrix Engine processes are running, use the following

SQL query:

CALL NZA..SP_MPI_STATS();

To abort a Matrix Engine, use the following SQL query (replacing

"123456789" with the engine’s job ID):

CALL NZM..KILL_ENGINE(123456789);

Netezza Matrix

Engine

Calculations using PBLAS or ScaLAPACK consume S-Blade

RAM for storing input matrices, intermediate work matrices, and

result matrices. Each matrix element consumes 8 bytes. Exceed-

ing available RAM may result in S-Blade restarts and aborted

computations. Available RAM equals total RAM minus the RAM

requirements of the Linux operating system, the Netezza system,

and concurrent, unrelated queries.

When using matrices please keep these maximum numbers in

mind. In future version more controls will be implemented to help

guard against exceeding these limits.

Netezza Matrix

Engine

An issue can exist if the matrix engine attempts to take up too

much memory on the Netezza system (if the size of the matrix

and its calculations becomes too large).

From a user's perspective, you may experience two situations:

 The matrix operation returns with “Out of memory” ex-

ception when the internal MatrixEngine assertion fails.

 Matrix operation returns with a “timeout” error when it is

killed by our OOM guard.

Netezza Matrix

Engine

The Netezza Matrix Engine uses the double precision (64-bit)

floating point approximate numeric data type for storage and

computation of matrix element values.

Row and column indices are stored as 32-bit integer values, al-

lowing up to 2,147,483,647 rows and columns. Row and column

indices begin at 1. An index value of zero is not permitted.

EXT-836 R Analytic Executa-

bles

Depending on the data types used for records, transfer of data

from the table to R memory can be very slow.

EXT-951 QUANTILE_DISC Use of the QUANTILE_DISC function may cause a core dump.

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 27 28

Kommentare zu diesen Handbüchern

Keine Kommentare

EDOBE XDOM PMML Bedienerhandbuch Seite 18

Kommentare zu diesen Handbüchern

Verwandte Produkte und Handbücher für Nein EDOBE XDOM PMML