“The Best-laid Plans…”


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

Oracle version 12 introduced the hybrid histogram as a performance improvement — such histograms are based on some ‘rules’ set forth in version 12.1. Those ‘rules’ are:

        1) a value should not be found in more than one bucket
        2) the bucket size is allowed to be extended in order to contain all instances of the same  (more...)

Tuning Time


"“You see,” he continued, beginning to feel better, “once there was no time at all, and people found it very inconvenient.
They never knew whether they were eating lunch or dinner, and they were always missing trains. So time was invented to
help them keep track of the day and get places when they should. When they began to count all the time that was available,
what with 60 seconds in a minute and 60  (more...)

Well, That Didn’t Work …


"There are no wrong roads to anywhere."
-- Norton Juster, The Phantom Tollbooth

Interesting behavior with the unified audit trail has been reported by Jeff Hunter and verified on at least two platforms, Solaris 10 and RedHat Enterprise Linux 6. While other ports of Oracle behave as expected (Windows and Oracle Enterprise Linux 7, to name two that I’ve tested) the problem platforms fail to return data from V$SESSION because the AUDSID values apparently (more...)

Eviction Notice


"Expectations is the place you must always go to before you get to where you're going. Of course,
some people never go beyond Expectations, but my job is to hurry them along whether they like it or not."
-- Norton Juster, The Phantom Tollbooth

Oracle has decided that Solaris needs to retire, giving those who are running Oracle on Solaris roughly two years to move to another operating system. A possible choice involves commodity (more...)

Export – Import Business, Again


"At first it was difficult to tell just what had changed—it all looked the same
and it all smelled the same—but, for some reason, nothing sounded the same."
-- Norton Juster, The Phantom Tollbooth

Doing things just because “they’ve always been done that way” may not be the best reason to stick with old and accepted processes and utilities. Oracle has changed significantly over the years and those improvements shouldn’t be ignored simply because (more...)

Here We Go, Again


"There are no wrong roads to anywhere."
-- Norton Juster, The Phantom Tollbooth

Every once in a while someone decides that Oracle functionality isn’t fast enough and makes a valiant attempt to correct these perceived deficiencies. Most of the time such efforts are anything but successful. From ‘home-grown’ referential integrity (which doesn’t work) to trying to speed up existing functionality the efforts are amazing and dismal at the same time. But that doesn’t keep (more...)

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...)