Edit the $OPENLINKINI file, e.g., /opt/openlink/bin/openlink.ini, and make sure the environment section for the driver contains the right entries.
It should look something like this:
[Environment Oracle 10.x]
ORACLE_HOME = /dbs/oracle10g/oracle/product/10.1.0/client_1
;ORACLE_SERVER = T
;TWO_TASK = P:
;ODBC_CATALOGS = Y ; Uncomment after loading odbccat10.sql
;MULTIPLEX_LDA = 5 ; Allow 5 OpenLink clients on a single lda
;OPL_USR_TBLS_FIRST = Y ; Sort SQLTables starting with user tables
SHOW_REMARKS = N ; Retrieve SQLColumns REMARKS field
CURSOR_SENSITIVITY = LOW ; Set to HIGH after loading odbccat10.sql
;OCI_PREFETCH_ROWS = 100 ; Number of rows to prefetch
;OCI_PREFETCH_MEMORY = 65535 ; Amount of memory to use for prefetching
;NLS_LANG = AMERICAN_AMERICA.UTF8 ; Set to codepage required by client application
ORACLE_SID = ORCL
These environment variable values are database specific and are described in detail later in this section.