At Oracle Open World there was a number of presentation on the new features that we will see in the new release of the database, which is being called 12c, where c is for the cloud.
The 12c Database/Next Release was announce during Larry’s Sunday keynote speech.
Health Warning: As with all the presentations at OOW that talked about what may be in or may be in the next release, there is no guarantee that these features will actually be in the released version of the database. Here is the slide that gives the Safe Harbor statement.
In addition to this key note there was a few additional presentations on 12c with the main one, for me, by Tom Kyte on the Thursday morning.
- The 12c database will be a multi-tenant database. What does this mean? If means that we can have multiple databases running on the same server sharing the same memory and process management. Under the current configuration, when we create a new database on a server we create a separate set of processes and memory allocation. Oracle is calling this, Pluggable Databases
- MapReduce in the Database - MapReduce can be run from PL/SQL directly in the database.
- Improved default value management. We will be able to clearly how to allocate a value to or calculate a value as a default for a column. The first of these is that we will be able to assign a sequence to a column. Example x int default s.nextval primary key. We can then insert into a table and not worry about how to calculate a primary key value, insert into t(y) values ('hello world');. We will also be able to specify a default value when no value is being inserted into a column, z number default on null 42
- Increased size for VARCHAR2, NVARCHAR2 and RAW data types up to 32K in size. You will need to se the Max_SQL_String_Size in the init.ora to EXTENDED. But this new size limit is not supported in clustered and index organised tables.
- Some improvements to PARTITIONing, with asynchronous global index maintenance for DROP and TRUNCATE partition. New CASCADE functionality for TRUNCATE and EXCHANGE partition. You will be able to perform multiple partition operations with a single DDL command.
- There will be better Statistics for query performance including Hybrid Historgrams, Session Private Statistics and statistics will be gathered during data loads automatically.
- Temporary UNDO for objects will be handled in TEMP
- Greater insight of data usage i.e .what is being used or not being used and how frequently. This allows policies in table definition (new ILM clause) to compress or archive data after time.
ALTER TABLE orders
ILM ADD CompressionPolicy
COMPRESS Partitions for Query
AFTER 90 days from creation;
This post focused on the core database new features what may be coming in 12c.
In my next blog post I will look at some of the coding/development changes that are coming in 12c and associated Oracle development tools
