Jure Bratina

Jure Bratina is an experienced Oracle DBA currently working as a Database Consultant with The Pythian Group. The areas he most likes to work on are troubleshooting and performance tuning of Oracle databases. Jure is also a member of the Executive Committee at the Slovenian Oracle User Group (SIOUG).

Oracle

Oracle PDB Default Service Limiting SQL Parallelism

While investigating a parallel query related performance problem in an 19.24 Oracle RACOne node database, I encountered ...

Oracle

DML Part of a Parallel INSERT Suddenly Started to Execute Serially in Oracle

This post is about investigating a non obvious reason an INSERT running in parallel suddenly started taking longer to ...

Oracle

Oracle Database Migrated to Cloud Starts Experiencing "log file sync" Waits

A client was moving an Oracle 11.2.0.4 database from their data center to one of the major cloud providers' ...

MySQL

Query Statspack's "SQL ordered by" Sections Over a Time Period

In this post, I'll present the statspack_top_sqls.sql script, which returns SQL performance statistics by mining the ...

Oracle

Mining Statspack and AWR Repositories for Historical Trends

There are various ways that we can approach the analysis of a past database performance problem. The initial steps ...

Oracle

Issues With Database Service Names Starting With Pluggable Database (PDB) Name

In this post I'll describe a problem which occurs when creating and using a database service name which starts with the ...

Oracle

Statspack vs. AWR: Wrong number of SQL Executions

This post is about a Statspack anomaly I discovered while analyzing execution trends of a particular SQL on one of our ...

Oracle

Investigating a Chain of Events Resulting in Occasional Query’s Degraded Performance in Oracle

Introduction A client asked us to verify why an INSERT AS SELECT statement, which was part of a scheduled ETL job ...

Oracle

Database Upgrade Fails With “unexpected error in validate_credentials”

This is a blog post about an issue that can occur during a database upgrade and produces a misleading error message. If ...

Oracle

After logon trigger in user schema and FRA full situation hang the database

This blog post is about a scenario where a combination of a logon trigger performing DML operations at user login time ...

Oracle

Interesting variations in outcome when cloning a CDB with a subset of PDBs in Oracle

Background Recently I was working on a client request where a CDB along with a subset of its PDBs had to be cloned to a ...

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Jure Bratina

Posts by Jure Bratina

Oracle PDB Default Service Limiting SQL Parallelism

DML Part of a Parallel INSERT Suddenly Started to Execute Serially in Oracle

Oracle Database Migrated to Cloud Starts Experiencing "log file sync" Waits

Query Statspack's "SQL ordered by" Sections Over a Time Period

Mining Statspack and AWR Repositories for Historical Trends

Issues With Database Service Names Starting With Pluggable Database (PDB) Name

Statspack vs. AWR: Wrong number of SQL Executions

Investigating a Chain of Events Resulting in Occasional Query’s Degraded Performance in Oracle

Database Upgrade Fails With “unexpected error in validate_credentials”

After logon trigger in user schema and FRA full situation hang the database

Interesting variations in outcome when cloning a CDB with a subset of PDBs in Oracle

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