Can one tablepace have their datafile on ASM also filesystem. ???

Hello Oracle Gurus''
1.can one tablespace have their datafile on ASM as well as filesystem ?? like 1 tablespace =1ASMfile + 1 localfilesystem file
2.also tell me will there be any database error code triggered on the DB alert log file. if we use the datafiles on ASM as well as local filesystem for one tablespace??and any performance issues on that tablespaces which resides on filesystem and ASM disk both? ..if all are fine how the filesystem datafile will be support for ASM rebalancing also mirroring level on ASM ??
3.what is type of SCN? is there any types we have ?
4.what are the wait events views on RAC clusters used? to monitor the cluster events and rectify the issues?

user13014926 wrote:
Hello Oracle Gurus''
1.can one tablespace have their datafile on ASM as well as filesystem ?? like 1 tablespace =1ASMfile + 1 localfilesystem file
Yes.
2.also tell me will there be any database error code triggered on the DB alert log file. if we use the datafiles on ASM as well as local filesystem for one tablespace??and any performance issues on that tablespaces which resides on filesystem and ASM disk both? ..if all are fine how the filesystem datafile will be support for ASM rebalancing also mirroring level on ASM ??
AFAIK no. The files which are present on the disk/file system only and not on asm, are not managed by it so no support for asm based striping and mirroring would be there for them.Second, rebalancing is NOT done for the files but for the disks when they are not present or have become offline due to some reason.
3.what is type of SCN? is there any types we have ?
Just remember one type, System Commit Number and forget about rest.
4.what are the wait events views on RAC clusters used? to monitor the cluster events and rectify the issues?Please see the Performance Tuning section of Oracle RAC Admninistration guide with a special attention to Cluster wait class and wait events related to it. Best is, use EM and it would show all the things in a nice manner.
HTH
Aman....

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