I figured I would give my top new features for the recently released Oracle 12c database. I think one of the most interesting new features is the Pluggable Database, but it seems like everyone is talking about that. So I’ll focus on other new features that I am interested in. This list is in no particular order.
- Default Values for Columns Based on Oracle Sequences – This will simplify coding since you won’t have to create a trigger for a new row. This leads to…
- IDENTITY Columns – I work with a lot of developers that come from a SQL Server background that may appreciate this functionality.
- Adaptive Query Optimization – The ability for the CBO to recognize that it got the plan wrong and switch to a new plan without DBA intervention is a big leap for Oracle’s SQL execution. This leads to…
- Dynamic Statistics – Oracle can detect that the stats led to a bad execution plan and use new stats the next time the query is executed. On many occasions, I find that the nightly Stats Gathering autotask is not updating tables’ stats because they are not considered “stale” yet they should be. Too many times, I fix poorly performing SQL simply by updating stats on a table and its indexes when it should be done automatically for me.
- Concurrent Execution of UNION and UNION ALL – The ability to parallel-ize these branches will lead to much faster executions. In my shop, we do use UNION and UNION ALL in many places in our application.
- Automatic Data Optimization (ADO) – The ability to automatically move older data to a different storage tier will reduce the DBA’s workload.
- In-Databaase Archiving – The ability to mark rows as “archived” and hide them from application users without moving will be well received for my company. We have a few processes were we move records from one table to another to archive them.
- LOGTIME parameter fro Data Pump – Timestamping log entries from a Data Pump run should have been included from the beginning.
- Move a Datafile Online – The ability to move a datafile while the tablespace is still ONLINE and READ WRITE will mean no downtime for that tablespace.
- Data Guard Fast Sync – This might just be the improvement which will allow us to implement the MAX PROTECT mode without impacting application performance. I haven’t played with this yet, but Active Data Guard Far Sync looks promising as well.
- PGA_AGGREGATE_LIMIT – to truly limit the total PGA size.
- Queryable Patch Inventory – No longer have to use ‘opatch lsinventory’ if you can query with DBMS_QOPATCH.
- Last Login Time – now available in SYS.USER$ is the time someone last logged in with that userid.
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I look forward to examining each of these in more detail.
