Oracle RAC how to start or stop cluser database with srvctl command

These commands are useful when handling the Oracle RAC databases. They can be executed from any of the nodes in the cluster:

$ srvctl start database -d dbName
$ srvctl stop database -d dbName

$ srvctl start instance -d dbName -i dbName1

$ srvctl start instance -d dbName -i dbName2

$ srvctl stop instance -d dbName -i dbName1

$ srvctl stop instance -d dbName -i dbName2

Oracle how to create table with "invisible" name

In Oracle it is possible to create a table with no name (just space):

create table " " 
   (col1 int,
     col2 varchar2(10));


Then you can use the following to select data:


select * from " ";