What is the difference between container database and pluggable database?
Container Database (CDB): This is the database that is created when that database supports Oracle’s multitenant option. It’s also called the ROOT container and is the CDB$ROOT within the data dictionary views of the CDB. Pluggable Database (PDB): These are the databases that are stored within the CDB.
Can databases be containerized?
Database server containers are gaining popularity because they are fast, simple-to-use, and very compatible with automation tools. This helps automate delivery of production data environments for Dev and QA, with a significant reduction in the number of Database server hosts being used.
How do I connect to a pluggable database?
Establishing a connection using user defined services involves the following steps:
- Create a database service with PDB property using the SRVCTL utility.
- Create an entry in the tnsnames. ora file for the service created.
- Start the service.
- Connect to the database using the service with the pdb property, created in step a.
How do I know the size of my pluggable database?
Check the Size of Oracle Database and PDB databases
select sum(bytes)/1024/1024 size_in_mb from dba_data_files; Check the total space used by data. select sum(bytes)/1024/1024 size_in_mb from dba_segments; Check the size of User or Schema in Oracle.
How do I find my pluggable database name?
Starting Oracle 12.2 sys_context(‘USERENV’,’DB_NAME’) will show the name of the Database in CDB$ROOT and the name of the PDB inside the PDB.
How do I know if my database is PDB or CDB?
You can query the CDB column in the V$DATABASE view to see if a database is CDB. If the current database is CDB, the column value will be YES, otherwise the CDB column value will be NO.
How do I open a PDB database?
Using a trigger to open all pluggable databases.
- sqlplus ‘/ as sysdba’
- SQL> CREATE OR REPLACE TRIGGER pdb_startup AFTER STARTUP ON DATABASE.
- SQL> BEGIN.
- SQL> EXECUTE IMMEDIATE ‘alter pluggable database all open‘;
- SQL> END pdb_startup;
- SQL> /
What is the difference between CDB and PDB in Oracle?
A CDB includes zero, one, or many customer-created pluggable databases (PDBs). A PDB is a portable collection of schemas, schema objects, and nonschema objects that appears to an Oracle Net client as a non-CDB.
How do I check my PDB status?
Check Startup, uptime and creation time of PDB database
- Check startup time of PDB database. col name for a8. col open_time for a33.
- Check uptime of PDB database. col name for a8.
- Check creation time and status of PDBS. select pdb_name,creation_time,status from dba_pdbs;
- Check size of PDBS. select name,open_mode,restricted,creation_time,total_size from v$PDBS;
How do I start PDB automatically?
Pluggable Database (PDB) Automatic Startup
Prior to 12.1. 0.2, when the CDB is started, all PDBs remain in mounted mode. There is no default mechanism to automatically start them when the CDB is started. The way to achieve this is to use a system trigger on the CDB to start some or all of the PDBs.
How do I check if a DB is container DB?
Check if the database is a CDB database or not it is an operation quite simple. You can check this by querying the v$database using the CDB field as the example below: ?
How do I open a pluggable database automatically?
Oracle Pluggable Database Automatic Startup
- Restart the container database:
- Check the status of PDBS: We can see the PDBS are in MOUNTED stage after starting CDB.
- Open the PDBS:
- Save the PDB state:
- check the saved state in dba_pdb_saved_states.
- Bounce the container database, to check the PDB state:
What is pluggable database?
A pluggable database (PDB) is a portable collection of schemas, schema objects, and nonschema objects that appears to an Oracle Net client as a non-CDB. PDBs can be plugged into to CDBs. A CDB can contain multiple PDBs. Each PDB appears on the network as a separate database.
How do you drop a container in database?
SQL> drop pluggable database PDB_TECHNO keep datafiles; Pluggable database dropped. In this way we can drop any pluggable database, dropping container database is like dropping any other database but we have to be sure before dropping it as it will drop all pluggable databases including seed PDB present under it.
How do I stop a PDB database?
Use the below queries to shutdown an individual PDB. We can also use close immediate clause as below: SQL> alter pluggable database PDB1 close IMMEDIATE; once we execute shutdown command, pdb will always stay in mount status.
How do I list PDBs?
DBA_PDBS views will list you the pluggable databases and their current state. PDB$SEED will be listed, but it’s not one of your pluggable databases, not one that you would worry about anyway.
What are the components of an Oracle instance?
An Oracle instance consists of three main parts: System Global Area (SGA), Program Global Area (PGA), and background processes. The SGA is a shared memory structure allocated when the instance started up and released when it is shut down.