Oracle Team

20c: AWR now stores explain plan predicates

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(…)

Oracle Materialized View Refresh : Fast or Complete ?

In contrary of views, materialized views avoid executing the SQL query for every access by storing the result set of the query. When a master table is modified, the related materialized view becomes stale and a refresh is necessary to(…)

Migrating From Oracle Non-CDB 19c to Oracle 20c

By Mouhamadou Diaw With Oracle 20c, the non-multitenant architecture is no longer supported. So, people will have to migrate their databases to container if they want to use Oracle 20c. There are many methods to transform a non-cdb database to(…)

티베로 – The most compatible alternative to Oracle Database

By Franck Pachot . Do you remember that time where we were able to buy IBM PC clones, cheaper than the IBM PC but fully compatible? I got the same impression when testing Tibero, the TmaxSoft relational database compatible(…)

Oracle Support: Easy export of SQL Testcase

By Franck Pachot . Many people complain about the quality of support. And there are some reasons behind that. But before complaining, be sure that you provide all information. Because one reason for inefficient Service Request handling is the(…)

“Segment Maintenance Online Compress” feature usage

By Franck Pachot . On Twitter, Ludovico Caldara mentioned the #licensing #pitfall when using the Online Partition Move with Basic Compression. Those two features are available in Enterprise Edition without additional option, but when used together (moving online a(…)

Find the SQL Plan Baseline for a plan operation

By Franck Pachot . If you decide to capture SQL Plan Baselines, you achieve plan stability by being conservative: if the optimizer comes with a new execution plan, it is loaded into the SQL Plan Management base, but not(…)

Oracle recovery concepts

I’ve published a while ago a twitter thead on some Oracle recovery concepts. For those who are not following twitter, I’m putting the whole thread here:   🔴⏬ Here I start a thread(…)

Oracle disables your multitenant option when you run on EC2

I have installed Oracle 19.6 on an EC2 for our Multitenant Workshop training. And of course, during the workshop we create a lot of PDBs. If you don't have paid for the Enterprise Edition plus the(…)

Oracle 20c SQL Macros: a scalar example to join agility and performance

By Franck Pachot . Let’s say you have a PEOPLE table with FIRST_NAME and LAST_NAME and you want, in many places of your application, to display the full name. Usually my name will be displayed as ‘Franck Pachot’ and(…)