Oracle Database 23c on a Mac with an M-Series Chip
Starting Position I got my MacBook Pro 16″ with an Apple M1 Max chip with 10 cores, 64 GB RAM and 4 TB disk in November 2021. At that time, the M1 chip had already been on the market for a year and I knew…
IslandSQL Episode 4: Expressions
Introduction In the last episode, we extended the IslandSQL grammar covering the complete lock table statement. However, the support for expressions was very limited. It was not possible to use a date literal or to_date function to determine a partition to be locked. Time to fix…
IslandSQL Episode 4: Expressions
Introduction In the last episode, we extended the IslandSQL grammar covering the complete lock table statement. However, the support for expressions was very limited. It was not possible to use a date literal or to_date function to determine a partition to be locked. Time to fix…
IslandSQL Episode 3: Lock Table
Introduction In the last episode we extended the IslandSQL grammar to cover all DML statements as single lexer token. Now it’s time to handle the complete grammar for one DML statement. The simplest one is lock table. A good reason to start with it and lay…
IslandSQL Episode 2: All DML Statements
Introduction In the last episode we build the initial version of IslandSQL. An Island grammar for SQL scripts covering select statements. In this blog post we extend the grammar to handle the remaining DML statements. The full source code is available on GitHub and the…
IslandSQL Episode 1: Select Statement
Introduction An island grammar focuses only on a small part of a grammar. The island represents the small, interesting part and the sea the rest. In this blog post, I explain the components of an island grammar for SQL scripts named IslandSQL. In the first…
optimizer_secure_view_merging and plsql_declarations
The Original Problem A customer is currently upgrading some Oracle databases from 11.2 to 19c. One query was extremely slow on the new test system and my job was to find out why. The root cause was that the database parameter optimizer_secure_view_merging was set to…
Quoted Identifiers #JoelKallmanDay
Background and TL;DR Connor McDonald wrote a blog post named Cleaner DDL than DBMS_METADATA. Back then he asked me if it would be possible to let the formatter remove unnecessary double quotes from quoted identifiers. Yes, of course. Actually, the current version of the PL/SQL…
DOAG2022 Highlights
Nobody knows what kind of restrictions we will experience later this year. That’s why the DOAG Conference + Exhibition 2022 took place in September instead of November. The organizers wanted an in-person event. While you can access some chosen content remotely an in-person event has…
Deleting Rows With Merge
The merge statement allows you to insert, update and delete rows in the target table in one go. This is great. However, the delete part does not work as expected. Is it a bug? No, it works exactly as documented. Nonetheless, I was not aware…