<ignorance level warning> I never programmed any VSAM I/O. I never took the time to read much about VSAM internals. </ignorance level warning>
I'm trying to understand SHAREOPTIONS. Read parts of DFSMSdfp using data sets, VSAM demystified, and the IDCAMS reference. Some became clear, some not. Here are some Qs to help me with the latter. - I could not find what the defaults are, if no SHAREOPTIONS are specified with the DEFINE CLUSTER? I cannot try myself because SMS forces me to a dataclass that has them specified. - Similarly, what is the default if only the "cross-region" option is specified but not the "cross-system"? I understand that the highest option level to be used with a specific application is determined by the application, how it is coded. The higher the level, the less VSAM helps to ensure data integrity. - Using a lower level than what the application supports, may negatively influence application parallelism. Using a higher level however jeoardizes data integrity. Is this correct? - What is the possible negative impact when a cluster is defined with SHAREOPTIONS(3) when the application asks for SHAREOPTIONS(3,3)? I understand the CBUF function would not be active. What happens to the applocation. Will it just fail? Would it depend on te programmer and whether he/she cared to handle this situation in te application? Thanks -- Peter Hunkeler ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
