udayangi wrote: > Thanks Jim for your quick reply. Yes I do use jrf -R to find out the > jrf recommendation. I am not sure how to get the seperation from the > jstat. In the below jstat what would be the seperation. I can see > the modulo is derived by applying the following. > > (574075 x 676)/3735 > > > jsh globdev ~ -->jstat -v F.SECURITY.MASTER > File ../bnk.data/sc/F.SECU000 > Type=J4 , Hash method = 3 > Created at Sat Dec 13 10:39:21 2008 > Groups = 103937 , Frame size = 4096 bytes , Secondary Record Size = > 8192 bytes > Restore re-size parameters : (none) > File size = 586186752 bytes , Inode = 592637 , Device = Id > 3211265 > Last Accessed Wed Mar 11 10:02:42 2009 , Last Modified Wed Mar 11 > 10:02:42 2009 > Backup = YES , Log = YES , Rollback = YES , Network = AUTO > Secondary control file = ../bnk.data/sc/F.SECU000]I > > > Record Count = 574075 , Record Bytes = 388259006 > Bytes/Record = 676 , Bytes/Group = 3735 > Primary file space: Total Frames = 142853 , Total Bytes = > 388259006 > Secondary file space: Total Frames = 0 , Total Bytes = 0 > The modulo isn't that useful in J4 files, but some experimentation may get you a something sometimes.
The separation is a multiple of the base frame size, which is 4096 bytes. As this file has a frame size of 4096 bytes, it has a separation of one. The secondary record size is the size beyond which a record will be placed into secondary space in the file and the group will use a pointer to point to the record in contiguous disk space. So here, if the record is less than two 'frames' in length it will be stored within the group, and after that it will be a pointer in the group to secondary space allocated at the end of the file. As the bytes per record is only 676 on average then there is no need for a separation anyway. jrf also allocates about 10% growing room, so it isn't dividing by 3735 Jim --~--~---------~--~----~------------~-------~--~----~ Please read the posting guidelines at: http://groups.google.com/group/jBASE/web/Posting%20Guidelines IMPORTANT: Type T24: at the start of the subject line for questions specific to Globus/T24 To post, send email to [email protected] To unsubscribe, send email to [email protected] For more options, visit this group at http://groups.google.com/group/jBASE?hl=en -~----------~----~----~----~------~----~------~--~---
