- Can Oracle TimesTen be used in conjunction with RAC? I hear that TimesTen will be compatible/integrated with 11g, but not exactly sure what that means.
- With the introduction of SecureFiles, are LOBs being phased off the long-term roadmap?
Monday, April 16th, 8:am
Ari Kaplan kicked things off, but quickly turned things over to Ken Jacob (Dr. DBA). He invited Andy Mendelsohn up to the stage, and finally Mark Zuckman ran the live demos. The big deal? 11g. I attended several other sessions that talked about the new features in more detail, so there may be some repetition, but here is what I wrote down.
Configuration Pack, which in my limited understanding, is kind of like an implementation of Project Lockdown - allows and enforces higher security. To that end, the Audit Vault is currently in Beta; Audit Vault allows audit information to be gathered in a remote database. Along with that feature, there will also be Database Vault, which allows one to set up "realms" of data; supposedly, it could be setup such that not even a DBA could access the data in a realm. I can see headaches on the horizon with that one.
Flashback transactions, via Flashback Archive, was introduced. Alledgly, one may be able to go back *years*. Of course, you know the storage requirements for that one are going to be pricey. *grin* This feature has been dubbed "Total Recall". Simple command to enable at table level; alter table &table_name flashback archive;
Next up, Information Lifecycle Management (ILM). This feature is somewhat like automatic partitioning, allow some data to be automatically archived to older (slower) mediums. For instance, given a historical table, data that is highly critical can be kept on ultra-fast disk, slightly older data can be stored on legacy disks, and even older data can sit on commodity drives.
Compression technology used for RMAN backups can now be utilized against live DML, causing a very small footprint in overhead and saving 2/3 the amount of space.
Partitioning has been enhanced to allow reference partitions (ie, foreign keys), interval partitions (month-by-month), and finally a comprehensive composite partition that incorporates all of 'em.
SecureFiles: the next evolutionary step of LOBs; faster & better.
Automatic self-management: promises for faster performance and more automation. A popular slide (popular because I saw it in several presentations) shows how things improved from 9i to 10g to 11g in areas like Memory, IO, Storage, etc. I am taking it with a large grain of salt due to the massive problems we had with 10g Memory auto management.
The ILM features allow a true workload to be captured on a source database (being backported to 10g) and fully replayed on a target database.
And SQL Plan Change Control was announced, but no details.
For me, the most cool part was afterwards. I remained behind to plan my next move (which I missed because....). Ken Jacobs, Andy Mendelsohn, Mark Zuckman, someone important named Richard (not Niemiec, but with Oracle), Leng Leng Tan and several IOUG board members congregated right in front of me. I was able to eavesdrop in on their candid discussions, which was really cool. I even piped up a couple times so as to unashamedly included myself in some small way. I was shocked to discover that Mr. Jacobs had some issues with the Enterprise Manager GUI (which was being demoed live, as I mentioned). A couple others agreed; most of the complaints centered around the size of fonts, complexity of layout and navigation, and lack of eye candy. I was amazed. I wish I could have jumped in and said, "Yeah, MySql looks so much better!" But that was probably not the right place for me to say that. =) They also talked about all the auto features, and how they have heard some small rumblings about DBAs possibly being automated out of job. I was glad to have traded that time for the sessions I missed.
Monday, April 16th, 10:30
RAC SIG Expert Panel
Moderated by Rich Niemiec
Panelists: Barb Lundhild (Oracle RAC PM), Erik Peterson (Oracle RAC Liaison), George Trujillo, Prabhaker Gongloor (aka GP, Oracle Grid Control Expert)
For some reason, I did not take many notes for this session; I think many of the questions asked of the group were general in nature. I am hoping that someone else who attended got more out of it then I did, and will be posting their thoughts.
Anyway, I was very impressed that the RAC SIG has such strong support. Not only the above list, but also big-name players like Alex Gorbachev and Christo Kutrovsky from the Pythian group, and Dan Norris and Matt Topper from ITConvergence.
Erik Peterson seemed very charismatic and eagerly wanting the RAC SIG to thrive; he wants RAC to be perceived as a great tool, and is willing to go above and beyond to help others in whatever difficulties they may have. At least, that is my impression.
My personal take-aways from the Expert panel were:
- Automate as much as possible
- Use EM and stop writing custom scripts
- Make the CBO smarter (how?), and try avoid using hints
- Low maintenance is key!
There was also mention of the various websites and forums. The forums seem to be doing particularly well! =)
Monday, April 16th, 2:15
Grid computing at Dell IT: Building the Megagrid
Logan has been the instigator of a 450 page/per month document, what he has affectionately labeled the "DBA Bible". Essentially, it is a comprehensive detail of all standards that apply to the DBAs job at Dell IT. Since Logan strongly believes in automation as the vehicle to adhere to standards, he feels that this massive encyclopedia is not only a "good thing" to have, but a requirement for all his DBAs. Logan also contends that automation removes the human-factor in errors, and allows the DBA to concentrate on more problem-solving and forecasting issues, opposed to the rote, dry hum-drum tasks of daily datatabase creations.
Enterprise Manager is highly advocated for monitoring and auditing standard compliance, especially in large environments with many databases.
Dell IT has implemented Shared Oracle Homes over NAS. I found this concept very intriguing and am wondering if it is feasible to apply this back home. It makes a lot of sense for particular scenarios; consolidates software trees, allows for a central area in which to do upgrades (or even downgrades, if one can retain older homes).
Dell IT has done a tremendous amount of research into various configurations with Linux and Oracle on Dell hardware. They have even gone to the extent of compiling a list of bug fixes that they feel are generally applicable for their validated configurations, allowing Dell IT to deliver recommendations to clients out of the box. As on Oracle Partner, they get their hands on the new toys, but more importantly, have a great working relationship with Oracle Support and developers, easing their research efforts.
Logan is a strong advocate of wrapping Oracle installs in RPMs, within Dell IT. I was not sure if he was recommending this for the general public or not, but it certainly seemed like a good idea if you have a package you want to deploy to RH boxes.
Monday, April 16th, 3:30
Virtualizing your development and test environments with VMWare
I had high hopes for this presentation, and was very excited about VMWare. However, none of the demos worked which really took the wind out of the sail for me. I think Matt had some good things to share, and I still think VMWare has a lot going for it in the realm of test and development.
Tuesday, April 17th, 7:30
Breakfast with the board
Mike Abbey announce a few things. Introduced Peter Smith, a IOUG volunteer newly elected to the IOUG board, and Steve Lemme, newly departing. He also mentioned the Savvy Survey, and that some of the answers were going to be available during the session (one big reason why I attended). Some IOUG member benefits were also made mention of:
- IOUG Best Practice Tip booklet
- IOUG Discounts if one joins a RUG
- OPEN (Oracle Professional Exchange Network)
I got to sit next to Peter, so that was kinda cool. Mike Abbey has a rough, sometimes dry sense of humor it seems. I talked to him after the breakfast and he came across really gruff. But I won that stinking survey, so I showed him. =) The survey was actually pretty interesting; covered several topics including facts about Las Vegas, Mandalay Bay, IOUG, Oracle and RUGs. I got a chance to quiz Ari Kaplan after the breakfast as well, and we were able to discuss other things, like how he is involved with some storage solutions at the U of I. I like Ari, he is friendly and easy to talk to. He is also a bit shorter then I expected, and almost soft-spoken.
Tuesday, April 17th, 9:45
ASM - A breakthrough in database storage management
I decided to attend this session at the last moment, as I was on my way to RAC Failover from the ITConvergence folks (Dan Norris and Matt Topper). I decided to do it because it had a lab, and I love labs. The funny thing is, they were having trouble getting the lab started due to problems with VMWare. What a coincidence; having just attended a session from Matt Topper the previous day *and* knowing that he was only a few doors away, I called him into the room. He had the problem fixed up in 5 minutes. Amazing!
On to ASM. I really enjoyed Arul's presentation. Ironically, I decided to not stay for the complete 2 hours, because there was another session I wanted to attend (next). Adding to the irony, some friends from CITES did stay, and they said the lab section sucked, because of all the problems they were having. The Lord moves in mysterious ways. *grin*
Arul did a great job at demystifying some things about ASM for the newbie. Or maybe it was simply one of those "Aha" moments for me, when things suddenly became a lot more clear. For starters, Arul showed how an ASM instance only requires a password file and a parameter file with two parameters (instance_name and instance_type). He made it very clear that there are no database files; no control files, no log files, no datafiles. He pointed out that one of the best practices (as pontificated by Arup Nanda) is to put ASM in its own Oracle Home (not shared), which allows the ASM to be patched independent of databases. There was some discussion of striping ASM over hardware striping. Arul has come to the conclusion that there will be 100% degradation due to dual-striping. However, Job Miller forwarded me a benchmark on ASM the week prior and it said that there is actually a slight performance *boost*. I am sure that I misread or misinterpreted something, so I have forwarded the white paper to Arul for his own determination. I need to go back myself and re-read the article to make sure I know what I am talking about.
Tuesday, April 17th, 11:am
Understanding Oracle RAC internals
Barb Lundhild, Product Manager
As I was preparing for IOUG, I read a few of the RAC papers. Many of them referenced Barb Lundhild's papers, so I thought I could not loose by attending one of her sessions. And I was right. =)
From talking with others, it seems she used a previous 10g presentation, and added some 11g features (which means she cannot post the presentation "as is").
For starters, 11g has enhanced the code for Split Brain conditions (when half or more of the nodes break off from the other half or less). Unfortunately, I did not take very good notes on this section for some reason. But 11g also adds the ability to dynamically increase the number of voting disks. Disk timeout is now a bit higher; I believe it used to be on the order of a second. I cannot read what I wrote, but disk timeout is also higher than another timeout (network? Something count), which means that the voting disk is the final arbitrator of split brain decisions (or node eviction).
Barb talked about a x$ view. I was not sure if it was new (and have been too lazy to check it out), but took down notes just in case. x$ksxpia has information on the interconnect information. In the context of bonded NICs, name_ksxpia would have the name of the network interface (whether bonded or not).
The LMS process responsible for reading/writing blocks to the interconnect. Oracle highly recommends a maximum of 2 cpus for each RAC instance (I believe 1 cpu can also be 1 core in the context, but not a Sun hyperthread). You need to guarantee that LMS will be given cpu time (otherwise known as real time). Another reason why folks give srong warnings about running VMWare for RAC, which does *not* guarantee real time.
When tuning the Grid, you want to make sure that you never see "GC CR block lost" (or any kind of lost block, for that matter). This event represents significant problems in the interconnect if it increases.
The topic of svrctl came up. I am really confused why Oracle decided so strongly to downplay svrctl in 8i and 9i, and then bring it back with a vengeance for the Grid. Are we also going to get a instctl or sidctl? =) Anyway, Barb emphasized that when you stop a database in svrctl, that will stop the instance *and* the service. However, starting the database does not necessarily do the same thing.
New with 10.2.0.3, if the VIP (Virtual/Private IP) goes away, only the listener and the service will die, *not* the instance! I guess before everything was biting the bullet. I am thinking that this "feature" ties into the voting disk being the final arbitrator, otherwise node eviction might get a little tricky with the instance running but no VIP.
I wrote down that "Application VIP" is new 10gR2. I am not sure if I meant R3, but since I never heard of it, I cannot be sure. Apparently, it registers resources to the clusterware.
She dropped some acronyms which are probably old hat for those who use RAC already (which would exclude me).
ONS is the Oracle Notification System.
FAN is Fast Application Notification.
ONS used by FAN to publish and subscribe.
Finally, one last tidbit about 11g; OCI session pools subscribe to Load Balancing for runtime stats.
Tuesady, April 17th, 12:15
RUG Business meeting
Peter Smith actually recommended this meeting to me, and while I found it interesting, I wish I would have spent my time elsewhere. I was introduced to some large User Groups like Rocky Mountaint and Utah, but personally I had absolutely no interest in growing my RUG. It was good to meet Tony Jedlinski and Megan Price; they had some good, practical things to share in a private conversation.
The rest of Tuesday
I made some poor decisions about which sessions to attend in the afternoon. I started with another 11g presentation (High Availability) by Ashish Ray. While Ashish is a good presenter, I found too much of the information to be review; he spent a lot of time on building the big picture from 9i to 10g. Probably spent less then 20 minutes total on 11g, and even that I had already heard in other sessions (ie, General Session, Barb Lundhild's RAC class). I wish I had done Alex Gorbachev's "Change Block Tracking inside out" as I initially planned; at least I have his paper. I next went to the RAC SIG Roundtable. This was a mixed bag for me; I felt way out of my league. =) For starters, I have zero experience with RAC. But it was cool to hobnob with the Pythian Group, Kyu-Mok Strickland from Boeing, Logan McLeod, Dan Norris, Erik Peterson, an intelligent fellow from GE Healthcare (Ryan? Brian?), and a couple other sharp folks whom I did not get names for. I kinda wish I had gone to Arup Nanda's "Performance Tuning in RAC", even if only to meet him and hear him speak. There were two other RAC sessions, but both were 2 hours long, and there is no way I had the mental stamina for a 2-hour session that late in the day.
I found my notes from Ashish's 11g HA presentation; don't know where they went.
- automagically repairs corrupt blocks that are mirrored
- fast resync of mirrored copy from transient errors (uses changed blocks)
- rolling upgrades for ASM instances
Flashback: back out transaction and all subsequent conflicts
Data Archive: archive cannot be modified, data has a retention policy
Data Recovery Advisor: diagnosis based on symptoms
RMAN: intra-file parallelization; duplicate/clone/standby over-the-wire
Dataguard: read-only physical standby; logical standby is even more flexible
Snapshot Standby: Redo data still shipped, but not applied. Rolls back standby using flashback
Fast-Start Failover: supports ASYNC log transport (MAX PERFORMANCE)
At one point, Ashish was pressed for time so he summarized a few slides by saying "Everything is faster."
- Source & Target compare & converge
- Split/merge for Hubs
- Cross-database LCR tracking
Online patching of one-off patches. Does not require RAC or dataguard.
Rolling upgrades via transent logical standby
Wednesday, April 18th, 8:30
Your 10g Tuning Arsenal: AWR, ADDM, ASH, Metrics and Advisors
One of the main reasons I attended this session was that I wanted to meet John, but I was also interested in his tuning techniques since he is well-known in this area. Unfortunately, I felt like I did not learn much from this presentation, mostly because I already use most of those tools and the session was more of an introduction than I was expecting. I am glad I met John; I ran into him several times after that and was able to talk with him.
Wednesday, April 18th, 9:45
Oracle Executive Session: Edward Screven, Chief Oracle Architect
Unfortunately, Mr. Screven could not make it, so two well-experienced Oracle specialists stood in for him; Tammy Bednar and Jack Brinson. Jack rubbed me the wrong way. =) Their presentation focused mostly on security features of 11g, which was good, but I was really hoping for some high-level pictures from Oracle's direction.
Take-away from this session:
- Database Vault is being backported all the way to 18.104.22.168; Oracle has never done this before
- Auditing best practices coming out soon
Most of the rest of the stuff had already been hinted at, or I simply was not interested in. I already had a picture of what Database Vault and Audit Vault were, and while the presentation had a couple more slides, there was not a whole lot of low-level detail.
Wednesday, April 18th, 11:am
Oracle Database 11g: Flashback
Daniel Liu (Oracle Principle Solution Architect)
Overall, I thought Daniel spent way too much time reviewing Flashback for 9i and 10g. I can understand that 11g builds on existing technology, but for a presentation that is meant to expose new features, we sure covered a lot of old territory. As a result, I did not come out of this session with much new information. I had already heard about Flashback Archive; the RVWR process was new to me. It works basically the same as LGWR, but writes the information in Reverse (hence the RV I believe).
Daniel also mentioned that it would be possible to flashback a standby database, but I was not able to ascertain exactly how that was done. As I learned from a different session, the standby databases in general have some nice features, and the ramifications of a Flashback Archive will be very interesting. For instance, 11g will make it rather easy to have a snapshot clone that you can write to, then flash it back to a point in time and re-synchronize with Production. Rinse and repeat.
Wednesday, April 18th, 12:15
Lunch and Learn
I had already had a private meeting with Wolfgang on Sunday, so I did not feel like I *had* to go to the Lunch and Learn. But I thought it would be very interesting. Our conversation topics were not necessarily geared towards Wolfgang's specialty that much (10053 trace, stats, histograms and PeopleSoft), but I did get a chance to talk with John Kanagaraj and Kyu-Mok Stricklin (Boeing) a bit. I felt good about doing some networking. And we had some excellent things to share with each other; at least, I hope what I shared was on the good side of "ok". =)
Wednesday, April 18th, 1:30
Oracle Database 11g: Next Generation Self-management and Change Assurance
Leng Leng Tan (Oracle VP for Database Management)
Mughees Minhas (Oracle, but I did not get his title)
I am kicking myself for not introducing myself to Mughees; Job Miller has told me a bit about him and has passed on some papers that I respected and appreciated.
Leng Tan did the presentation, and I got a lot of out it. This was my best choice of the day! =)
ADDM for RAC - identifies global performance problems:
- instance response time skew
- cache fusion interconnect issues
- lock manager issues
- hot blocks
- global high-load SQL
I am curious why RAC would not have these seemingly essential qualities all the way from 9i. It is rather odd that these great features are making a debut 2 versions later. Wow. At least they are finally coming out.
There was a lot of information for Automatic SQL tuning as well; pretty amazing stuff. They are finally moving down the path of having the database automatically tune all the sql that is being thrown at it. I say "finally" because they sold 10g as doing this, but the fine print spelled out that 10g really just lays the foundation to make automation possible. 11g actually implements it. What I consider to be a slightly downside, the automatic tuning seems to concentrate on SQL Profiles; while I think that is a considerable and effective solution, it is more like putting a band aid on the problem, while not fixing the root problem itself. If I recall correctly, the new tuning features will be analyzing all SQL statements out of the box, and can report on known issues (bad indexes, poorly written query, etc). Another aspect of this idea which I thought was a good decision is that even though the analytical part of the feature will happen all the time, the actual implementation part (ie, making the Profile "real") is purely optional. The tuned sql will be stored in AWR, and Robert Freeman mentioned that they will be retained for about a year. I find that hard to believe, but will be interested in seeing the real thing.
There are some new advancements for partitions; aside from having a truly comprehensive composite key, we are also getting a interval partition, along with functionality to automatically create new partitions based on that interval. Since we have a need for that exact feature now (and I am sure others as well; Tom Kyte mentioned that he uses rolling partitions based on date), I am really looking forward to this.
Database Replay; Wow, this is going to be big, I think. It will be a database option, and has the ability to capture a true workload into flatfiles. Yes, strange choice there, why flatfiles? Not sure about that. Again, this is building on one of the promises of 10g; when the introduced AWR with 10g, there was a lot of hype about capture workloads, but I never saw a real implementation of it. Now we can run the application and actually capture everything necessary to replay it back, verbatim, on any database. The replay part is an Oracle delivered client which reads the flat file; I was not able to extract more information about what that client actually was, but it will come from Oracle. It has features to match the timings from the recorded session, and does not need to be parallelized externally. I am still wanting more details, like how will it handle an underpowered target database, and how does it simulate data output (what do you do with 50 million rows returned to the screen?).
Along the same lines, there will be an option for SQL Performance Analyzer, which works very similarly to Replay, but replays everything linearly, with no concurrency. I am confused why this is needed if you are already using the Automatic SQL tuner; perhaps to benchmark queries that the auto-tuner cannot further tune? I will have to research that a little more.
Leng Tan threw in a couple slides about new provisioning features (available in 10gR3); I thought they were out of place, but I'll mention it like I wrote it down. Apparently, one can stage a "gold image", allowing for easy scaling (either up or down) in a RAC. I should have taken more notes on this feature.
Along with the Automagically tuned SQL, Oracle is finally giving us much better Plan Management. It is actually this feature that allows plans to be stored for a year or so in the AWR. Features support Plan Baseline and subsequent comparisons, which ties into the Auto Tuner; apparently the auto-tuner will test all new plans and actually verify they are better. Of course, we have all been bit by "better" low-cost plans that run slow than "worse" high-cost plants. I am curious if that will be addressed. I do not want the CBO to globally discard plans simply because the cost is higher.
There will be an Automatic Diagnostic Workflow, which will be responsible for automatically create an incident when you hit an ora-600 (or other bugs?), and will do a "first failure capture" of all relevant trace files, alert log, etc. I got the impression it was like Configuration Manager with RDA rolled in. Leng presented some interesting pictures, which I am sure will be making the rounds on the 'net sooner or later; the process flow seems very attractive.
Some new features in Patch Automation are also be making a debut in 10gR3; I have not yet tried it, but apparently there is support for rolling patches. In 11g, there are also proactive advisories from Metalink and complete support for online, one-off patches (including the Diagnostic ones). Leng explicitly pointed out that they have a long-term goal of making the CPU patches (yes, I hate the redundancy of terms) fully online.
Some enhancements in Enterprise Manager; one will be able to group targets, along with functionality to act at a group-level. One will also be able to establish hierarchies within groups, and can rollup hierarchies into "systems". It seems like there is great interest in managing *everything* about an enterprise-wide database installation. =)
Thursday, April 19th, 8:30
Case Study: Migration of ASM for RAC and non-RAC
I had high expectations for this presentation, but I guess they were too high. While Sumit seemed very knowledgeable, I found most of the material to be duplicated from other sessions. The number of sessions offered on Thursday were very limited, and not much I was interested in attending.
Thursday, April 19th, 9:45
The Answer to Free Memory, Swap, Oracle and Everything
I am glad I attended at least one presentation by the Pythian group (have I mentioned them enough?). And anyone who starts off with a reference to Douglas Adam's has got to be cool anyway. *smile* Christo's explanation and observations about memory were very valuable well conceived. He painted a picture that painfully describes how expensive memory on disk is, and how much faster cpu registers are. This paved the path for HugePages, a page table scheme that significantly increases the size of the pages. By such a drastic increase in size, he showed a 512 times reduction in the number of page tables, and a huge improvement in memory allocation.
The one possible downside is that you have to allocate the memory up front when the OS starts. HugePages do not swap! They are pinned in physical memory. In retrospect, I am thinking to myself that anytime you pin something in memory and decrease the number visits to disk, you are going to see increases in performance unless, of course, your memory is too small. *grin*
He wrapped it up by talking about the benefits of using direct_io, and due to the bugs in Oracle releases 22.214.171.124 and lower, he highly recommends using 126.96.36.199 or higher. Not sure about the 10g code base, but I assume there is a similar story there.
Christo was also kind enough to share his blog: pythian.com/blogs/authors/kutrovksy. (NOTE: the blog he put on his presentation was sans-authors, I believe, but you get a 404 Page not found if you try that)
Thursday, April 19th, 11:am
Nothing. Nada. There were only 3 sessions to choose from, and only one looked even remotely interesting. I used the time to go over my notes and start my review of the week at IOUG.
Thursday, April 19th, 12:15
IOUG Closing Session - The great tool debate
Moderated by Mike Abbey
I was shocked and underwhelmed at how sparse and poorly attended the closing session was. My guess is that many folks either skipped the whole day or left early in the morning. A poor way to end such a prominent convention. Plus, the closing session was a bit weird, for a closing session. I have to admit, the one and only reason I stuck around was to find out the results of the Savvy Survey. Even that was a bit lackluster; was I one of three people that even attempted it? I and another guy (Frank Ponds) earned boasting privs at the end of it all, which included a backpack of little goodies (Oracle Wait Interface, PL/SQL Programming, 3 IOUG shirts, a mini usb mouse, a Oracle usb Hub, a IOUG pen and a CD of all the posted papers), and a fee waiver for a IOUG 2008 University session. Considering that the University sessions are a bit exorbitant (in price), that is nothing to sneeze at, but chances are I will not even be going next year. I kinda feel sorry for Mike Abbey. He totally gave me a bad first impression, but to have the closing session and Savvy Survey with so few numbers was a little disheartening.
But wait, what about the Great Tool Debate?!? Oh yeah, almost forgot that. =) I really like what George Trujillo emphasized again and again. No matter what tool you use, in the end it comes down to knowledge and experience, and today's typical shop has done a great disservice to application deployment in general by severely segregating the DBAs from the Developers. His comments got me to thinking that perhaps we should exercise a bit more cross-training. I come from a programming background, and have tried numerous times to get a foot in with the developers in their world. However, the one big bad dragon I stay away from is our ERP, a nasty beasty called Banner from SunGard/SCT. That should probably change.
Rich Niemiec has a court jester side to him; his personal presentation of himself is confident and authoritative (the black suite, black, slick-backed hair) but he often has something humorous to inject, sometimes delivered in a very dry, non-sense way that may catch you off guard. My favorite comment of his; ".Net (dot Net) is .dying (dot dying)". I was not familiar with the others, who represented APEX, PeopleSoft and Java shops. A number of people (most notably Rich) said Ruby on Rails is going to be the wave of the future next. For me, I don't really care; a tool is a tool, and as someone stated (George?), you have to use the right tool for the job, there is no silver-bullet here.
There were many sessions I wish I had attended. And I am really excited about going back and reading presentation notes from other folks who attended Collaborate07, not to mention trying to work my way through some of the posted presentations and papers. There is just so much! As this was my first major Oracle event, and only the second convention of my career, I feel that I could have done a better job preparing; mostly in the form of deciding for sure exactly which sessions I wanted to attend, and why. I had a list of "primary" and "secondary" choices, but that all went out the window as I reconsidered my options. For example, I completely did not factor in the fact that no 11g papers would be available, so if you wanted the information, you pretty much had to go to the session. Unless you have friends in high places. *grin* Additionally, one of my colleagues attended the convention, not to mention several friends from a sister department; I wish I could have collaborated with them a bit more, both before and during.