Starting at release 10.1.15, the problem with "uvlictool" hanging UniVerse when issuing to a "pipe" will be fixed (ECase 7640*USA).
When hung on the "Port status" semaphore, the "State" column would show = 1 as follow : ---- Port status State Netnode Owner Collisions Retries Semaphore # 1 1 0 0 1 13 ---- (I've seen this only once in 10 years supporting UniVerse...) The "Collisions" and "Retries" columns are mentionning occurences of conflicts in concurrent access toward this semaphore. Since this semaphore is used only for internal purposes by the "PORT.STATUS" command, in operating normally, such conflicts on the "Port status" semaphore would not occur because the "PORT.STATUS" command is a Database Administrator command that can be accessed only from the UniVerse Administration account (installation account). What would you think of a Database administered simultaneously by several concurrent "Database Administrators" ? It's worth knowing that, in its internal mechanism, the "PORT.STATUS" command queries by a signal "SIG_USR2" all the database sessions to put in their "Printer Shared Memory" segment their most recent "Last command processed". Then, for every database session, "PORT.STATUS" attaches to each "Disk Shared Memory" segment, passes the information to a memory buffer in the "Disk Shared Memory" segment, detach from the "Disk Shared Memory" segment, reads this information from the central buffer and formats the displayed output, each user one after the other. Note that since release 9.6.x of UniVerse, the "PORT.STATUS" command may not display ALL UniVerse interactive sessions : If, for any reason, it is failing to attach and get the information from a given user's "Printer Shared Memory" segment, "PORT.STATUS" just continues processing with next session, leaving the unaccessible user's session not mentionned in its report. The "PHANTOM" sessions are just mentionned "unavailable" when such event occurs. Regards, Hervi BALESTRIERI Support Technique Avanci - Produits "U2" IBM Software Group - DB2 Information Management Software Web : http://www.ibm.com/software/u2/ ------- u2-users mailing list u2-users@listserver.u2ug.org To unsubscribe please visit http://listserver.u2ug.org/
