15 minutes overview of how to use these features in Oracle SQL Developer: Get an Explain Plan Customize the display of the plan Get a cached plan Use DBMS_XPLAN Compare Plans Use Real Time SQL Monitoring Use AutoTrace. And if you want an awesome video, MUCH more in depth about how to read a plan, then I suggest this from …
SQL Developer 4.2 Oracle Execution Plans – More Columns Available
Someone on the Forums (yes, we read and respond!) noticed they couldn’t add Bytes or Time to their plan displays in Oracle SQL Developer. So we just made all of the columns available now, even if a few them might not make sense, i.e. TEMP_SPACE, OTHER. Preferences – Database – Autotrace/Explain Plan New things highlighted/boxed… So let’s look at a …
Force a Different Path with Automatic Plan Hints
Are you smarter than the optimizer? Are you hiding critical information from it? Perhaps your stats are missing, stale, or a bit misleading? I don’t want to get into whether hints are good or bad – they can only be used to accomplish good or bad things. They are often absused – so please don’t take this post as carte …
Demo: AutoTrace – Generate Hints and Compare Different Execution Plans & Stats
For some reason I procrastinated setting up my video software on my new work machine. Big mistake. I put together this animated GIF to show some new things in version 4.2: Updated formatter – better support for ANSI joins Opening objects referenced in your execution plans Inserting Hints Not new but underutilized: how to compare plans/AutoTraces One Last Thing… …don’t …
Labeling Your Query Blocks with Hints
SQL can be hard to read. Execution plans can be EVEN HARDER to read. It doesn’t get any easier when you are joining a table to itself. Or maybe you are having a hard time finding the portion of a plan to correlates to a subquery. We do have a solution! QB_NAME Hint (Docs) /*+ QB_NAME ( qb_name ) */ …
Why Is My SQL Slow & Go Faster Features
Yesterday I made my first presentation ever at the annual Hotsos conference. The topic: “All of the Performance Tuning Features in SQL Developer.” It went pretty well, and I’d like to share those slides now with y’all: Tuning & Diagnostics Features in Oracle SQL Developer from Jeff Smith Easier to Read Autotrace Execution Plans Apparently I said ‘explain plan’ too …
Explain Plan ‘Notes’ in Oracle SQL Developer
Oracle ACE Director, BI/data/all things cool and extraordinaire, Stewart Bryson had a bit of a complaint about our favorite tool today. He wants Explain Plans in SQL Developer to show the same notes you can see in SQL*Plus… @thatjeffsmith See… no execution… and the notes. With one little statement. pic.twitter.com/w3GYkIPaDY — Stewart Bryson (@stewartbryson) November 4, 2014 So how do …
30 SQL Developer Tips in 30 Days, Day 10: Compare Stuff Side By Side
We try to make comparing things easy to do. When you’re troubleshooting, you frequently need to know why A isn’t quite like B. So let’s look at a few scenarios. Execution Plans or Autotrace Runs Run a plan or autotrace. Pin it. Run another. Right-click on one, and compare with the other. Voila. Looking at Objects, Side By Side So …
Explain Plan and Autotrace Enhancements in Oracle SQL Developer 4
“Explain Plans are useless.” Yikes. Really? Don’t we spend all day looking at execution plans? To clarify, I would say that explain plans could be useless. If you do an Explain, you’re actually looking at a theoretical plan, not the ‘actual’ plan. From the docs: With the query optimizer, execution plans can and do change as the underlying optimizer inputs …