OBI Apps Informatica Performance Tuning – Optimizing SIL Read Throughputs – Teradata Response Buffer Size Optimization

Teradata Response Buffer Size

For the reader connection to source data from a Teradata database, ODBC connection is used out of the box. There is another option using piped FastExport utility connection with which there has been mixed success and will be discussed in a later blog post. OBDC can be tuned to achieve better performance in read throughput by changing the response buffer size. MaxRespSize is used to change the value in ODBC.ini. The default is 8192. The max value that can be specified is 1048576. From experience at a client site, simply specifying the max value did not help in improving the throughput. Increase the value systematically to determine the sweet spot for a network. The graph bellow illustrates throughputs achieved at different MaxRespSize values

Driver=/usr/odbc/drivers/tdata.so

Description=Teradata Linux 64-bit

DBCName=DWTESTcop1.XXXX.COM

SessionMode=Teradata

StCheckLevel=0

LastUser=

Username=

Password=

Database=

DefaultDatabase=

OutPutAsResultSet=Yes

MaxRespSize=8192

OBI Apps Informatica Performance Tuning - Optimizing SDE Read Throughputs - Oracle DB Network Optimization

Oracle DB Network Optimization

After exhausting query performance with viable indices, consider modifying Session Data Unit (SDU) and Transport Data Unit (TDU) parameters to increase session throughput. The default value of SDU and TDU is 2048 and the maximum is 32767. These can be set as global parameters in sqlnet.ora or for a particular descriptor in tnsnames.ora. They need to be set on both server and client. Consider setting these parameters in tnsnames.ora so that it affects only a particular connection descriptor that is used for Oracle DB server to Informatica server communication. The SDU and TDU parameters can be set higher depending on the network and memory. Get help from your Infrastructure team in determining the MSS (Maximum Segment Size) of the network. Ideally they should be in the multiple of MSS. In addition, the SDU should not be greater than TDU. Ideally, they should be the same. For slower networks, consider a lower value.

Client Side Configuration (Informatica Server):

tnsnames.ora:

CRMOLTP =

  (DESCRIPTION =

(SDU=32768)

  (TDU=32768)

    (ADDRESS_LIST =

      (ADDRESS = (PROTOCOL = TCP)(HOST = crmoltp.xyzcompany.com)(PORT = 1521))

Server Side Configuration:

listener.ora:

SID_LIST_LISTENER =

(SID_LIST =

(SID_DESC =

(SDU=32768)

  (TDU=32768)

(GLOBAL_DBNAME = CRMOLTP)

(ORACLE_HOME = /u01crmoltp/oracle/product/10.2.0)

(SID_NAME = CRMOLTP)

)

)

tnsnames.ora:

CRMOLTP =

(SDU=32768)

(TDU=32768)

(DESCRIPTION =

(ADDRESS =

(PROTOCOL= TCP)

(Host= CRMOLTP)

(Port= 1521))

(CONNECT_DATA =

(SID = CRMOLTP)

)

)