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What is the use of SID in Oracle?
The System Identifier (SID) identifies a specific database instance. The SID uniquely distinguishes the instance from any other instance on the same computer. Each database instance requires a unique SID and database name.
What is the SID of my Oracle database?
The SID is a site identifier. It plus the Oracle_home are hashed together in Unix to create a unique key name for attaching an SGA. If your Oracle_sid or Oracle_home is not set correctly, you’ll get “oracle not available” since we cannot attach to a shared memory segment that is identified by magic key.
What is Oracle home used for?
An Oracle home is a directory into which all Oracle software is installed and is referenced by an environment variable. The Oracle home consists of the following: Directory location where the products are installed.
What is the difference between service name and SID in Oracle?
Oracle SID is the unique name that uniquely identifies your instance/database where as Service name is the TNS alias that you give when you remotely connect to your database and this Service name is recorded in Tnsnames.
What does Sid mean in database?
A SID is a unique name that uniquely identifies the database instance where as a service name is the Database TNS Alias that is given when users remotely connect to the database.
What is the difference between Oracle base and Oracle home?
Difference between ORACLE BASE and ORACLE HOME Oracle BASE and Oracle HOME are the directories defined by the Oracle Flexible Architecture. Oracle Base is the top level directory or you can say root directory. Under Oracle Base you can have multiple Oracle versions with different Oracle HOME.
Why do we need to export Oracle Sid variable?
When that child process completes, it returns a code to the parent (success or failure) – AFAICR, – 0 is success, failure is anything else. So, the new bash process spawned by your shell (aka “the child”) takes its variables from your original (i.e. the spawning or parent) bash shell.
How do I set Oracle Sid in Bash?
Open an operating system command window. Ensure that the environment variables ORACLE_HOME and ORACLE_SID are set properly. The commands to use to set these environment variables depend on the shell you use to interface with the operating system. For example: (bash or ksh) export ORACLE_SID=orcl. (csh or tcsh) setenv ORACLE_SID orcl.
Why do I get Oracle not available when my Sid is not set?
If your Oracle_sid or Oracle_home is not set correctly, you’ll get “oracle not available” since we cannot attach to a shared memory segment that is identified by magic key. On NT, we don’t use shared memory but the SID is still important. We can have more then 1 database on the same oracle home so we need a way to id them.
Why do we need to export Oracle-Oracle-home?
I have always export my ORACLE_HOME and ORACLE_SID variable and e.g. using invoking sqlplus is no issue. I thought have thought that sqlplus is able to be invoked because it is in my PATH variable with $ORACLE_HOME/bin added to $PATH.