Unified Front


"The most important reason for going from one place to another is to see what's in between."
-- Norton Juster, The Phantom Tollbooth

In Oracle’s most recent release, the audit options have been expanded and modified to create the Unified Audit Trail, a ‘one-stop shop’ for recording and reporting audit information. A new view, UNIFIED_AUDIT_TRAIL, provides access to the audit details:


 Name                                                          Null?    Type
 ------------------------------------------------------------- -------- ----------------------------
 AUDIT_TYPE                                                             VARCHAR2(64)
 SESSIONID                                                              NUMBER
 PROXY_SESSIONID                                                        NUMBER
 OS_USERNAME                                                             (more...)

“It’s The Latest Version!”


"Expect everything, I always say, and the unexpected never happens."
-- Norton Juster, The Phantom Tollbooth

It’s inevitable that shops will eventually need to upgrade to Oracle 12.2.0.1 since 11.2.0.x is soon to be out of support and Oracle 18 (which would have been 12.2.0.2 but Oracle has decided to name new releases with the last two digits of the year of release) is looming (more...)

Go Big …


"You see, to tall men I'm a midget, and to short men I'm a giant;
to the skinny ones I'm a fat man, and to the fat ones I'm a thin man."
-- Norton Juster, The Phantom Tollbooth

For years DBAs (and users) have been searching for the elusive ‘go_faster’ initialization parameter in Oracle, only to be disappointed at every turn as no such setting exists, at least not with that name. Oracle has, (more...)

It’s From The Catalog


"Have you ever heard a blindfolded octopus unwrap a cellophane-covered bathtub?"
-- Norton Juster, The Phantom Tollbooth

Database upgrades aren’t terribly difficult in general, unless the upgrade is for an RMAN catalog database that has two catalogs with different versions. It’s completely ‘legal’ to have an 11.2.0.x RMAN catalog database with an additional 12.1.0.x catalog; this is where the going can get rough during an upgrade since the (more...)

Roll With It


"I know one thing for certain; it is much harder to tell whether you are lost than whether you were lost,
for, on many occasions, where you are going is exactly where you are. On the other hand, if you often find
that where you've been is not at all where you should have gone, and, since it's much more difficult to
find your way back from someplace you've never left, I suggest you go  (more...)

Parallel Reality


"Expect everything, I always say, and the unexpected never happens."
-- Norton Juster, The Phantom Tollbooth

The following question was recently posted in an Oracle forum:


hi Friends,
I see  this wait event latch: parallel query alloc buffer, when a job meant for doing some cleanup ran this query.
Why does this wait event come happen? , i searched google,MOS no exact hit for explanation of the exact same event.
Looking at query does  (more...)

That’s Not A Latch


"They all looked very much like the residents of any small valley to which you've never been."
-- Norton Juster, The Phantom Tollbooth

While investigating latches another interesting process popped up that’s smaller and lighter, that performs a similar function, called a mutex. So what is a mutex? By definition it’s a mutual exclusion object that locks memory structures to prevent concurrent sessions from changing the same object at the same time, so in (more...)

Latch, What Latch?!?


"I know one thing for certain; it is much harder to tell whether you are lost than whether you were lost, 
for, on many occasions, where you are going is exactly where you are. On the other hand, if you often find
that where you've been is not at all where you should have gone, and, since it's much more difficult to
find your way back from someplace you've never left, I suggest you go  (more...)

Extended Engagement


"You see, to tall men I'm a midget, and to short men I'm a giant; 
 to the skinny ones I'm a fat man, and to the fat ones I'm a thin man."
-- Norton Juster, The Phantom Tollbooth

Oracle offers, in release 12.1.0.2, the option of increasing the maximum string length from the standard 4000 to a whopping 32767; depending on the nls_length_semantics setting this could be in bytes or in (more...)

The BLOB


"Have you ever heard a blindfolded octopus unwrap a cellophane-covered bathtub?"
-- Norton Juster, The Phantom Tollbooth

An interesting question was posted on the Oracle General Database forums fairly recently, inquiring about creating a B-Tree index on a BLOB column to speed queries looking for NULLs in that BLOB. The conventional wisdom states that, because it’s a BLOB, NULLs shouldn’t be present. And because it’s a BLOB, containing binary data, creating sucn an index (more...)