(SM-1902) Sybase IQ transparent storage

Owned by SNP
Jan 15, 2019
2 min read

Storage setup

  • Storage ID: name of the storage
  • Storage Type: type of the storage. Use storage type "SM_TRS_SIQ" for the Sybase IQ transparent storage.
  • Description:  short text description


  • Connection mode: O for open connection; open SQL is used
  • DB Connection Name: existing SAP database connection.
  • Load stripe size: optional, see below the Performance improvements section
  • Load stripe width: optional, see below the Performance improvements section

Performance improvements

Load striping

"Striping data across multiple disks is an essential technique for good performance.

Disk striping can be performed at different places in a system, often as part of RAID hardware or software". More information can be found under Disk striping.
Load striping parallelize data inserts across multiple disc drives. In order to setup stripe load, a database connection should be configured to support this feature.
Example configuration of DBCO:
SYBASE_SERVER=<server>.<domain>.<ext>
SYBASE_PORT=<port> e.g.34238
SYBASE_IQ_ENGINE=server_NLS_42
SYBASE_DBNAME=SAPIQDB
SYBASE_CONTYPE=IQ
SYBASE_IQ_LOAD=1
SYBASE_IQ_CESU-8=1
SYBASE_IQ_LOCKWAIT=600
SYBASE_IQ_BUFFER_SIZE=500000
SIQ_BULK_OP=1
Please refer to Sybase IQ documentation, page 75.

Example from the HD1 system, DBCO:
SYBASE_SERVER=vsks032
SYBASE_PORT=2648
SYBASE_IQ_ENGINE=vsks032_HD1
SYBASE_DBNAME=SAPHD1DB
SYBASE_IQ_LOCKWAIT=600
SYBASE_CONTYPE=IQ
SYBASE_IQ_CESU-8=1
SYBASE_IQ_LOAD=1
SYBASE_IQ_BUFFER_SIZE=500000

After DBCO is configured to support the stripe load, you should enable striping in storage management setup, as follows: (screenshot above).
Settings :
  • Load stripe size: size of stripe on disc, expressed as a multiple of SYBASE_IQ_BUFFER_SIZE value
  • Load stripe width: degree of parallelism
More information on SAP Stripe load implementation.


Partitioning

Partitioning allows parallel inserts into a DB table.

To use partitioning, you must first create (register) partitioning on a table. To perform this call the method /DVD/SM_IF_TAB-ADD_TABLE_PARTITIONING. Partitioning must be enabled on an empty table, ideally just after creating it (CREATE_TABLE).

Afterwards create a partition, before inserting data, by calling the method /DVD/SM_IF_TAB-ADD_PARTITION. Otherwise the INSERT statement will fail, because data cannot be assorted to partitions.

There are two corresponding methods to check if partitioning is enabled on a table: /DVD/SM_IF_TAB-PARTITIONING_EXISTS and to check if partition with given name exists on the table /DVD/SM_IF_TAB-PARTITION_EXISTS.