A quick post to let you know about the two presentations that I’ll be doing at Oracle Open World 2014.
Session ID: UGF4482
Session Title: “Getting Started with SQL Pattern Matching in Oracle Database 12c“
Venue / Room: Moscone South – 301
Date and Time: 9/28/14, 13:30 – 14:15
Session ID: CON4493
Session Title: “Regular Expressions (more...)
Oracle’s 220.127.116.11 was released a few weeks ago (You can download it from OTN here: Oracle 18.104.22.168 Download). While technically a minor point release, it contains a couple of major features that would normally be rolled out in a more substantial version change like 12cR2 or perhaps V13. Of course the most highly anticipated feature is a new option (Oracle In-Memory Option) that provides a column (more...)
One of the really cool new features introduced in 22.214.171.124 is Attribute Clustering. This new table based attribute allows you to very easily cluster data in close physical proximity based on the content of specific columns. As I’ve discussed many times, indexes love table data that is physically clustered in a similar manner to the index […]
Over the last two weeks I’ve been working on a heartbeat monitoring solution for a client. This is not the normal heartbeat solution provided by Oracle as described in note 1299679.1; yet very similar. The approach that I configured is similar to a traditional heartbeat setup but uses the same extract and replicats already being used by the database/application. For simplicity reasons, I like to call this approach an Integrated Application Heartbeat.
In order (more...)
If you have done any play with the latest release of Oracle database 12c, you must have come across the concept of Common and Local users. I won’t rewrite what’s already there in the docs but for setting the context of the post, a Common user must be created with a prefix added to the username-C##. Miss that and you won’t be able to create one while being connected to the Container database. On (more...)
OTech Magazine – Summer 2014
The fourth issue of OTech Magazine, the independent magazine for Oracle professionals, is available. For the summer 2014 issue there are some more personal articles included. Titles vary from The Spiritual Programmer to The Next Generation: Oracle SOA Suite 12c and back via How to protect your sensitive data using Oracle Data Vault.
Download OTech Magazine – Summer 2014 here.
Just a quick post on a new Exadata feature called Zone Maps. They’re similar to storage indexes on Exadata, but with more control (you can define the columns and how the data is refreshed for example). People have complained for years that storage indexes provided no control mechanisms, but now we have a way to exert our God given rights as DBA’s to control yet another aspect of the database. Here’s a link to the (more...)
Counting the number of distinct values (NDV
) for a table column has important
applications in the database domain, ranging from query optimization to optimizing reports for large data warehouses. However the legacy
SQL method of using SELECT COUNT (DISTINCT <COL>) can be very slow
. This is a well known problem and Oracle 126.96.36.199 provides a new function APPROX_COUNT_DISTINCT implemented with a new-generation algorithm to address this issue by providing (more...)
Every once in awhile when I restart an extract, I see entries in the report file that reference “Bounded Recovery”. What exactly is “Bounded Recovery”?
First, keep in mind that “Bounded Recovery” is only for Oracle databases!
Second, according to the documentation, “Bounded Recovery” is a component of the general extract checkpointing facility. This component of the extract guarantees an efficient recovery after an extract stops for any reason, no matter how many uncommitted transactions (more...)
I was aware that up to Oracle 11g, a PL/SQL program wasn’t allowed use an associative array in a SQL statement. This is what happens when I try to do it.
SQL> drop table test_array purge;
SQL> create table test_array as
2 select level num_col from dual
3 connect by level <= 10;
SQL> select * from test_array;
On the 22nd of july, patchset 188.8.131.52 for Oracle 12c database was made generally available for Linux x86-64 and Solaris.
This patchset includes the eagerly awaited In-memory option which promises an application transparent performance boost by using column-format data storage in memory.
Database In – Memory uses an In-Memory column store (IM column store), which is a new component of the Oracle Database System Global Area (SGA), called the In-Memory Area. Data (more...)
There seems to me to be a relatively simple choice.
Either you except that the Oracle Optimizer has a wealth of complicated strategies and, in this complex effort to get the best executions it can, will inevitably either get it wrong sometimes (or take some extra executions to realise it’s wrong).
Or you stick your head in the sand and raise a bug for every unexpected poor execution or plan flip.
But let’s say that (more...)
Oracle Database 184.108.40.206 has finally been released and it has a number of really exciting goodies from an indexing perspective which include: Database In-Memory Option, which enables specific portions of the database to be in dual format, in both the existing row based format and additionally into an efficient memory only columnar based format. This in […]
After much anticipation the new Release 1 of Oracle 12c (220.127.116.11) is finally available! Get it here: http://www.oracle.com/technetwork/database/enterprise-edition/overview/index.html What does this mean: Oracle’s ground breaking In Memory Database is now available! As they say…this is BIG. Get more details about In Memory here: http://www.oracle.com/technetwork/database/in-memory/overview/index.html I am very excited about the possibilities of what we can […]
Just checked Tim’s latest post and guess what, Oracle database 12c’s latest release, 18.104.22.168 is available now for download. It is available as an OTN download as well as from E-Delivery. Seems like that there is no documentation update available yet as the New Features guide still doesn’t have 22.214.171.124 included in it. But I am sure that it’s coming soon!
So grab your copy now and happy downloads :=).
Replicating data can be a time consuming process to setup. Fortunately, Oracle GoldenGate provide a few tools to help ease the complexity of setup. One of these tools is the “macro”. Macros are used to simplify and automate the work associated with setting up and replicating data. So what exactly is a macro? Oracle defines a macro as:
A macro is a built-in automation tool that enables you to call a stored set of processing (more...)
Yesterday, Oracle released a new critical patch update (CPU Jul 2014) for July 2014. This CPU contains fixes for 5 database vulnerabilities. The most critical one, CVE-2013-3751, has a base score of 9.0 and affects Oracle 12.1 only. The same issue was already fixed for Oracle 11.2 in July 2013 (CPU Jul 2013).
After a short research on the web (google and twitter, less than 5 minutes) I found an (more...)
A few weeks ago we upgraded one of our production server, adding another CPU tray. This brought the number of CPU cores from 80 to 160, and took us from 2Tb of RAM to 4Tb (just in time for Oracle to announce the in-memory database in 126.96.36.199!).
However when I went to start things up, ASM wasn't starting up, giving me these errors:ORA-04031: unable to allocate 32 bytes of shared (more...)