|Oracle® Database Administrator's Guide
12c Release 1 (12.1)
|PDF · Mobi · ePub|
This preface contains:
The following are changes in Oracle Database Administrator's Guide for Oracle Database 12c Release 1 (12.1).
The following features are new in this release:
Oracle Multitenant option
Oracle Multitenant option enables an Oracle database to function as a multitenant container database (CDB) that includes 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. All Oracle databases before Oracle Database 12c were non-CDBs. You can unplug a PDB from a CDB and plug it into a different CDB.
Resource Manager support for a multitenant environment
Resource Manager can manage resources on the CDB level and on the PDB level. You can create a CDB resource plan that allocates resources to the entire CDB and to individual PDBs. You can allocate more resources to some PDBs and less to others, or you can specify that all PDBs share resources equally.
Full transportable export/import
Full transportable export/import enables you to move a database from one database instance to another. Transporting a database is much faster than other methods that move a database, such as full database export/import. In addition, you can use full transportable export/import to move a non-CDB (or an Oracle Database 11g Release 2 (18.104.22.168) database) into a PDB that is part of a CDB.
New administrative privileges for separation of duties
Oracle Database now provides administrative privileges for tasks related to Oracle Recovery Manager (Oracle RMAN), Oracle Data Guard, and Transparent Data Encryption. Each new administrative privilege grants the minimum required privileges to complete tasks in each area of administration. The new administrative privileges enable you to avoid granting
SYSDBA administrative privilege for many common tasks.
Database Smart Flash Cache support for multiple flash devices
A database instance can access and combine multiple flash devices for Database Smart Flash Cache without requiring a volume manager.
Undo for temporary objects is stored in a temporary tablespace, not in the undo tablespace. Using temporary undo reduces the amount of undo stored in the undo tablespace and the size of the redo log. It also enables data manipulation language (DML) operations on temporary tables in a physical standby database with the Oracle Active Data Guard option.
Move a data file online
You can move a data file when the data file is online and being accessed. This capability simplifies maintenance operations, such as moving data to a different storage device.
Multiple indexes on the same set of columns
You can create multiple indexes on the same set of columns to perform application migrations without dropping an existing index and recreating it with different attributes.
Move a partition or subpartition online
DML operations can continue to run uninterrupted on a partition or subpartition that is being moved without using online table redefinition.
Online redefinition of a table in one step
You can use the
REDEF_TABLE procedure in the
DBMS_REDEFINITION package to perform online redefinition of a table's storage properties in a single call to the procedure.
Online redefinition of tables with multiple partitions
To minimize downtime when redefining multiple partitions in a table, you can redefine these partitions online in a single session.
Online redefinition of tables with Virtual Private Database (VPD) policies
To minimize downtime, tables with VPD policies can be redefined online.
New time limit parameter in the
dml_lock_timeout parameter in the
FINISH_REDEF_TABLE procedure in the
DBMS_REDEFINITION package can specify how long the procedure waits for pending DML to commit.
You can make individual table columns invisible. Any generic access of a table does not show the invisible columns in the table.
COLUMN with default value for nullable columns
A nullable column is a column created without using the
NULL constraint. For certain types of tables, when adding a nullable column that has a default value, the database can optimize the resource usage and storage requirements for the operation. It does so by storing the default value for the new column as table metadata, avoiding the need to store the value in all existing records.
Copy-on-write cloning of a database with CloneDB
When cloning a database with CloneDB, Oracle Database can create the files in a CloneDB database based on copy-on-write technology, so that only the blocks that are modified in the CloneDB database require additional storage on disk.
When the logging of DDL statements is enabled, DDL statements are recorded in a separate DDL log instead of the alert log.
See "DDL Log".
Some information that can be used to debug a problem is recorded in a separate debug log instead of the alert log.
See "Debug Log".
Full-word options for the Server Control (SRVCTL) utility
For improved usability, each SRVCTL utility option is a full word instead of single letter.
Transaction Guard and Application Continuity
Transaction Guard ensures at-most-once execution of transactions to protect applications from duplicate transaction submissions and associated logical errors. Transaction Guard enables Application Continuity, which is the ability to replay transactions after recoverable communication errors.
Enhanced statement queuing
Critical statements can bypass the parallel statement queue. You can set the resource plan directive
BYPASS_QUEUE for a high-priority consumer group so that parallel statements from the consumer group bypass the parallel statement queue.
New Job Types
Several new script jobs have been added that permit running custom user scripts using SQL*Plus, the RMAN interpreter, or a command shell for the computer platform.
See "Script Jobs".
The following features are deprecated in this release and may be desupported in a future release:
IGNORECASE argument of ORAPWD
To support strong authentication, Oracle recommends that you set
n or omit
IGNORECASE entirely. The default value of this optional ORAPWD argument is
See "Creating a Database Password File with ORAPWD" for further information.
Oracle Restart is a feature provided as part of Oracle Grid Infrastructure. Oracle Restart monitors and can restart Oracle Database instances, Oracle Net listeners, and Oracle ASM instances. Oracle Restart is currently restricted to manage single instance Oracle databases and Oracle ASM instances only, and is subject to desupport in future releases. Oracle continues to provide Oracle ASM as part of the Oracle Grid Infrastructure installation for Standalone and Cluster deployments.
Single-character options with Server Control (SRVCTL) utility commands
All SRVCTL commands have been enhanced to accept full-word options instead of the single-letter options. All new SRVCTL command options added in this release support full-word options only and do not have single-letter equivalents. The use of single-character options with SRVCTL commands might be desupported in a future release.
See "SRVCTL Command Reference for Oracle Restart" for further information.
FILE_MAPPING initialization parameter
FILE_MAPPING initialization parameter is deprecated. It is still supported for backward compatibility.
See Oracle Database Reference for information about the
FILE_MAPPING initialization parameter.
This view continues to be available for backward compatibility.
See "Specifying Scheduler Job Credentials" for further information.
See Also:Oracle Database Upgrade Guide