ONE NODE RAC Features in Oracle Database 11g Edition

•Available from 11gr2, Express Edition.

•High availability feature.

•Provides Cold failover Solution.

•Automates instance relocation incase of instance failure or fault in the first node.

•Facilitates rolling upgrade for single instance database.

•Live migration of instances across servers.

•Uses omotion utility to migrate the instance.

Query to Find Free Space in a Tablespace

undefine tbsp
set lines 152
set echo off

col tablespace_name for a20
select utbs.tablespace_name,
round(utbs.mb) "Allocated Used/Unused MB",
round(Ftbs.mb) "Allocated_Free MB",
round((100/utbs.mb)*Ftbs.mb) "%Allocated_Free MB",
decode(sign(round(utbs.Maxmb-utbs.mb)),-1,0,round(utbs.Maxmb-utbs.mb)) "Space_AutoExtensible MB",
Ftbs.MaxBytes "MaxChunk MB"
from
(select ddf.tablespace_name,sum(ddf.bytes)/1048576 MB,sum(ddf.maxbytes)/1048576 MaxMB
from dba_data_files ddf
group by ddf.tablespace_name) Utbs,
(select dfs.tablespace_name,sum(dfs.bytes)/1048576 MB,max(dfs.bytes)/1048576 MaxBytes
from dba_free_space dfs
group by dfs.tablespace_name) Ftbs
where utbs.tablespace_name=ftbs.tablespace_name
and utbs.tablespace_name like '%&&TBSP%'
order by round(Ftbs.mb)
/