Tag Archives: Oracle Database 12c

Longer Identifiers in Oracle Database 12c Release 2

Prior to Oracle Database 12c Release 2, all object names had been limited to just 30 bytes. This limitation lead to some interesting problems, especially if you wanted to use descriptive names for the database objects you were creating.

Take for example the dictionary tables we wanted to create in 12.1 to help manage SQL Plan Directives. The first table was DBA_SQL_PLAN_DIRECTIVES, with 23 characters, which wasn’t problem. However, the second table we wanted was DBA_SQL_PLAN_DIRECTIVES_OBJECTS. Continue reading

Posted in New Features, Oracle Database 12c New Features | Tagged , | 2 Comments

12.2 and Tim Tams

Yesterday saw Oracle complete the release of Oracle database 12c Release 2 when the software became available for download on Oracle.com for both Linux & SPARC. Earlier this year I was lucky enough to have an opportunity to grab a … Continue reading

Posted in AskTom, Oracle Database 12c New Features | Tagged , | 1 Comment

Oracle Database 12c Release 2 Available Everywhere!

Today Oracle Database 12c Release 2 became available for download on Oracle.com for both Linux & SPARC. So anyone who wasn’t ready to try 12.2 in the Cloud can now play around with it, in the comfort of their own environment.

With each new release of the Oracle Database come fundamental architectural changes, driven by new technologies and user requirements. This has never been more evident than with Oracle Database 12c, which has 3 marquee features: Continue reading

Posted in Database In-Memory, Multitenant, Oracle Database 12c New Features, Sharding | Tagged , , , | 2 Comments

Histogram sample size and Online Statistics Gathering

I got a great follow up question to my earlier blog on Online Statistics Gathering; that I thought might be of interest to other and worthy of a short post of its own.

The question related to sample size used to gather histograms on a table that originally had its statistics gathered via a direct path load operation.

Let’s look at any example: Continue reading

Posted in AskTom, Optimizer, Oracle Database 12c New Features | Tagged , , | 1 Comment