What is Sid and serial in Oracle?

The oracle reference has this to say: SID Session identifier. SERIAL# Session serial number. Used to identify uniquely a session’s objects. Guarantees that session-level commands are applied to the correct session objects if the session ends and another session begins with the same session ID.

How do I find my Oracle SID serial number?

To identify the session index number (sid) and serial number of a session, query the V$SESSION dynamic performance view as shown below. The value of the STATUS column will be ACTIVE when the session is making a SQL call to Oracle. It will be INACTIVE if it is not making a SQL call to Oracle.

What is the difference between GV session and V session?

V$ views contain statistics for one instance, whereas GV$ views contain information from all the active instances. Each GV$ view contains an INST_ID column of type NUMBER, which can be used to identify the instance associated with the row data.

What is Last_call_et in V session in Oracle?

LAST_CALL_ET. NUMBER. If the session STATUS is currently ACTIVE , then the value represents the elapsed time (in seconds) since the session has become active. If the session STATUS is currently INACTIVE , then the value represents the elapsed time (in seconds) since the session has become inactive.

What is the difference between Sid and schema?

A schema and a user are pretty much the same in Oracle. When you create a user, a schema with the same name is automatically created. There is no concept of a “database” the way there is in Sybase or SQL Server. The SID is the identifier for an instance which is something completely different.

What is difference between Sid and service name 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.

How do I block a blocked session?

Avoiding Blocks

1. Reduce the length of time your application holds locks.
2. If possible, access heavily accessed (read or write) items toward the end of the transaction.
3. Reduce your application’s isolation guarantees.
4. Consider your data access patterns.

How can I unlock a locked table in Oracle?

Unlock An Oracle Table

1. Get the object ID of the locked table: SELECT object_id FROM dba_objects WHERE object_name=’YOUR TABLE NAME’;
2. Get the SID values for this ID: SELECT sid FROM v$lock WHERE id1=OBJECT ID FROM STEP1.
3. Get the session values for these SIDs:
4. Kill the sessions causing the lock:

What is difference between Sid and database name?

database name is the name of the database. SID is short for session id – a unique identifier for each session in a database.

What is database SID?

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. The Service name is recorded in the tnsnames.

What is the difference between Sid and service name in Oracle?

Sid= SID(system identifier) is a unique name for an Oracle database instance. DB Name(database name) = Name of the database (database can be shared between multiple instances ) Instance Name = it is same as Oracle SID. service name =SERVICE NAMES specifies one or more names for the database service to which this instance connects.

What is the Sid of a database?

“SID = identifies the database instance (database name + instance number). So if your database name is somedb and your instance number is 3, then your SID is somedb3.” is wrong. There is no such catenation of identity or name.

Where can I find the Sid (service name)?

The SID is included in the CONNECT DATA parts of the connect descriptors in a TNSNAMES.ORA file, and in the definition of the network listener in the LISTENER.ORA file. Also known as System ID. Oracle Service Name may be anything descriptive like “MyOracleServiceORCL”.

What is serservice_name in Oracle 8i?

SERVICE_NAME is the new feature from oracle 8i onwards in which the database can register itself with the listener. If the database is registered with the listener in this way, then you can use the SERVICE_NAME parameter in tnsnames.ora otherwise – use SID in tnsnames.ora.