Ingres 9.2 Migration Guide - Actian

Corresponding Parameter NamesIngres 6.4 Parameterrdf.memoryrdf.tbl_colsrdf.tbl_idxsrule_depthscf.row_estimateserver_classsession_accountingshared_cachesole_cacheIngres Parameterrdf_memoryrdf_tbl_colsrdf_tbl_idxsrule_depthscf_rowsserver_classsession_accountingcache_sharing (ON)cache_sharing (OFF)TypeDerivedsole_server sole_server Derivedstack_sizestack_sizewrite_behind dmf_write_behind (see notes) CacheNotes on Specific DBMS Server ParametersNote the following:• The 6.4 QEF sorting algorithm is unsuited to large qef_sort_mem settings.All recent Ingres versions use a different sort that does not degrade withlarge qef_sort_mem settings. The 6.4 standard setting is much smallerthan the Ingres default.• Recent Ingres versions typically require significantly less qsf_memory thanIngres 6.4 does, perhaps as little as half. After upgrading, start with thesame qsf_memory setting as Ingres 6.4, but monitor QSF memory usagewith trace point QS501 and tune qsf_memory appropriately.• The quantum_size parameter in an internal threads (slaves) installation isoften set to a small number (50 to 100) to improve responsiveness.Quantum_size has a different meaning in an OS threads installation, whereit should not be set to less than 300, or excessive polling of the sessioncommunications channel will occur. A quantum_size of 1000 is usuallyappropriate when OS threads are in use.116 Migration Guide