What is the difference between tablespace and datafile?
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What is the difference between tablespace and datafile?
An Oracle database consists of one or more logical storage units called tablespaces, which collectively store all of the database’s data. Each tablespace in an Oracle database consists of one or more files called datafiles, which are physical structures that conform to the operating system in which Oracle is running.
What is V datafile?
V$DATAFILE displays datafile information from the control file. See Also: “V$DATAFILE_HEADER”, which displays information from data file headers. Column. Datatype.
What is different about V datafile and Dba_data_files?
Moreover, dba_data_file is a data dictionary view which is static and will hold the data across startup and shutdown while v$datafile is a dynamic performance view which is populated with the new information at each startup. Information in the dynamic performance views comes from control file and memory structures.
Where is datafiles in Oracle for tablespace?
View Tablespace and datafile Information SELECT * from DBA_TABLESPACES; To view all the datafiles of a particular tablespace, execute the following command. This command will display all the datafiles that as currently associated with thegeekstuff tablespace. This will also display the size of the datafiles in MB.
How many datafiles can a database have?
This is the default type of tablespace in Oracle database. Small file tablespace can have multiple datafiles and each datafile can be as much as 222 data blocks in size. A small file tablespace can have maximum up to 1022 data files but this number depends on your Operating system also.
How do I add a datafile to tablespace?
To add datafiles to a tablespace, use either the Add Datafile dialog box of Enterprise Manager/GUI, or the SQL command ALTER TABLESPACE. You must have the ALTER TABLESPACE system privilege to add datafiles to a tablespace.
What is V PDBS Oracle?
V$PDBS displays information about PDBs associated with the current instance. Column. Datatype.
What is size of the datafile?
With Oracle 10g a new feature was introduced called BIGFILES. BIGFILE tablespaces allow for one very large datafile per tablespace instead of multiple smaller files….Database/tablespace block size.
| Block size | Maximum datafile size | Maximum database size |
|---|---|---|
| 8 K | 32,768 GB | 2,147 PB |
| 16 K | 65,536 GB | 4,294 PB |
| 32 K | 131,072 GB | 8,589 PB |
What is the difference between tablespace and schema?
A schema is a namespace – a logical thing. It is used to organize the names of database objects. It has nothing to do with the way the data is stored. A tablespace is a physical thing.
How many datafiles can be created in a single tablespace?
A tablespace belongs to only one database and has at least one datafile that is used to store data for the associated tablespace. We can also define tablespaces as logical storage units made up of one or more datafiles. One tablespace can have up to 1022 datafiles.
How many datafiles can a tablespace have in Oracle?
A smallfile tablespace is a traditional Oracle tablespace, which can contain 1022 datafiles or tempfiles, each of which can contain up to approximately 4 million (222) blocks. Dependent on the operating system. An external table can be composed of multiple files.
How do you create a tablespace?
Introduction to the CREATE TABLESPACE statement
- First, specify the name of the tablespace after the CREATE TABLESPACE keywords. In this example, the tablespace name is tbs1 .
- Second, specify the path to the data file of the tablespace in the DATAFILE clause.
- Third, specify the size of the tablespace in the SIZE clause.
How do I assign a user to a tablespace?
1 Answer
- Tablespaces are not owned by users, but you can grant quota on a tablespace to a user with the QUOTA ON TABLESPACE command, e.g. ALTER USER username QUOTA UNLIMITED ON tablespacename;
- To create a table or index, privileges required are CREATE TABLE and CREATE INDEX , respectively.
What is the difference between V session and GV 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 V database Oracle?
V$DATABASE displays information about the database from the control file. Column. Datatype.
How do I check my PDBS status?
Check Startup, uptime and creation time of PDB database
- Check startup time of PDB database. col name for a8.
- 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.
