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Conference eps::oracle

Title:	Oracle
Notice:	For product status see topics: UNIX 1008, OpenVMS 1009, NT 1010
Moderator:	EPS::VANDENHEUVEL

Created:	Fri Aug 10 1990
Last Modified:	Fri Jun 06 1997
Last Successful Update:	Fri Jun 06 1997
Number of topics:	1574
Total number of notes:	4428

1571.0. "raw devices 64k" by BARNA::DSMAIL () Mon Jun 02 1997 10:15

    
    	Hi people:
    
       A simple cuestion.
       
       I have a customer that he asks me about raw devices.He has Oracle
       database using raw devices.
       Oracle said that Digital Unix utilises a 64k operating system header
       at the begining of each raw device.
       
       I have tested this with dd comand.
      
       dd if=/etc/inittab of=/dev/rrz5c 
    
       dd writes in a block 0 if not labeled 
                     or 
       block 1 if the disk is labeled using in dd command seek=1
    
       Is true that Digital Unix uses a 64k or is a caracteristic of
       Oracle?
       
       Thanks,in advanced.
       Helps will be welcome.
    
       Francesc

T.R	Title	User	Personal Name	Date	Lines
1571.1	Re: raw devices 64k	AMCUCS::KKDAS	Let's Train The Trainers	`Mon Jun 02 1997 15:34`	9
	This is an Oracle implementation to avoid confusion. Unlike other databases (Informix and Sybase) Oracle doesn't allow an offset in raw disks, therefore, datafile creation would fail if a partition is used that starts from block 0 (default partitions 'a' and 'c' of a labeled disk) but it will succeed for other partitions. Introducing a default offset of 64K eleminates the confusion. /KK/
1571.2	Thanks	BARNA::DSMAIL		`Tue Jun 03 1997 11:03`	3
	Thanks.
1571.3	Oracle version ?	NNTPD::"[email protected]"	qcav01::srinath	`Tue Jun 03 1997 11:22`	12
	Hi KK Thanks for that .1 info - But i have faced problems when using the 'a' partition as raw. The Oracle version was 7.1.6 and Digital Unix 3.2c, any high volume i/o on that partition would create failure of the datafile. Putting a redolog(raw) in that partition was fatal for me on one occasion. Any ideas why this happened?. 73's srinath [Posted by WWW Notes gateway]