By Franck Pachot . In a previous post I introduced Tibero as The most compatible alternative to Oracle Database. Compatibility is one thing but one day you will want to compare the performance. I’ll not do any benchmark here but show you how you we can look at the performance with TPR – the Tibero Performance Repository – as an…
By Franck Pachot . In a previous post https://www.dbi-services.com/blog/awr-dont-store-explain-plan-predicates/ I explained this limitation in gathering filter and access predicates by Statspack and then AWR because of old bugs about reverse parsing of predicates. Oracle listens to its customers through support (enhancement requests), though the community (votes on database ideas), and through the product managers who participate in User Groups and…
By Franck Pachot . AWR collects segment statistics, and this can be used to quickly understand an abnormal database growth. Here is a script I use to get, from the AWR history, the segments that have grown by more than 1% of the database size, in one hour. First I must mention that this uses only the part of AWR…
By Franck Pachot . In a previous post I explained how the AWR views have changed between 12.1.0.1 and 12.1.0.2 and now in 12.2.0.1 they have changed again. This is a good illustration of multitenant object link usage. What’s new in 12cR2 is the ability to run AWR snapshots at CDB or PDB level. I really think that it makes…
By Franck Pachot . If you have read my latest blog posts, you know I’ve measured IOPS with SLOB to estimate ACFS overhead on a fast storage. This blog is about something I learned after wasting one hour on the result. Here is how I did my tests: Create a SLOB database in ACFS Run SLOB PIO tests and tag…
By Franck Pachot . Yesterday I was giving my ‘Interpreting AWR Reports’ Prezi at Oracle Midlands. There is a point where I explain that I always check the ‘Captured SQL account for …% of Total DB Time (s)’ in order to know whether I’ll get all details in the report or not. There are two main reasons why the most…
By Franck Pachot . When presenting ‘Interpreting AWR Reports – Straight to the Goal’ at UKOUG TECH15 I had a very good question about the Statspack report I read which had log file sync much smaller than user commits. I realized that this needs a longer explanation, and that my slide is very misleading because I divided log file sync…
Chacun d’entre nous à une façon bien différente d’appréhender le rapport AWR (Oracle Automatic Workload Repository). Nous utilisons nos propres processus de lecture et notre propre appoche. Dans ce blog je vous propose de découvrir AWR Formatter, un outil qui permet de concentrer les informations en quelques clics. Il s’agit d’un plug-in (AWR-Format.crx) pour Google Chrome fort sympatique, qui permet…
By Franck Pachot . Because people know that I really like Oracle AWR reports, they send them to me from time to time. Here is one I have received for Christmas with the following question: ‘Since our AIX server is virtualized, the response times are 4x longer. I feel that we are CPU bound, but cpu usage is mostly idle.…
