Blog | Pythian | Database (7)

Oracle

Understanding the Implications of Creating a New PDB Using CREATE_FILE_DEST

Overview When creating a new pluggable database, or PDB, you can optionally include the CREATE_FILE_DEST clause. Here’s ...

Cassandra

How to Perform (UDC) User-Defined Compactions in Cassandra

User-defined compactions allow us to manually select which files should be compacted. This enables us to reclaim space ...

Oracle

Post-Mortem Analysis Tools: Systemstate Dump

Previous Highlights Editor’s note: This “post-mortem analysis” series consists of four posts in total. Make sure you ...

Oracle

Enable Oracle Flash Cache on Red Hat Linux

The Oracle Smart Flash Cache feature was originally introduced in the 11gR2 version of Oracle Database. It works as an ...

Cassandra

Let’s deal with high read latencies in Cassandra

High latency values may indicate a cluster at the edge of its processing capacity, issues with the data model—such as ...

Oracle

Five Best Practices for Setting Dispatchers on Shared Connections

In this post I’d like to present five best practices/tips for setting dispatchers for database shared connections: 1. ...

Oracle

Change Port Number in Common Object Service (COS) Naming Service for Reports Server Discovery

Recently I received a request to change the port number used by an Oracle reports naming server. I looked into MOS and ...

Oracle

“The Cluster Upgrade State is [ROLLING PATCH]” with Correct Patch Level in all Nodes

I was performing a spot health check in a client environment, when I encountered this: [oracle@dbserver1 ~]$ crsctl ...

Oracle

How to Clean up Trace and Audit Files for Multiple Homes

I’ve been working on a simple method to clean up audit and trace files for multiple homes. Identifying Grid and ...

MySQL

Watch Out When Running Out of Disk Space With InnoDB Group Replication Cluster

Oracle MySQL Community Edition comes with a native, virtually synchronous, clustering solution called InnoDB Cluster. ...

Oracle

Automating APEX Applications Backup

In a previous post, I discussed that the APEXExport tool may be the best one to use when exporting APEX applications. ...

Oracle

WebLogic Admin Console 12.2.1.4.0 Is Not Starting Due to Coherence GE 12.2.1.4.0

In this post I’ll address the situation where, after installing Fusion Middleware (FMW) 12.2.0.4, the WebLogic Admin ...

Oracle

Post-Mortem Analysis Tools: ASH Dump

Editor’s note: This “post-mortem analysis” series consists of four posts in total. Make sure you also check out: ...

Oracle

Part One: Deploying High Available Applications in Oracle Cloud Infrastructure: Preparing Your Environment

This is Part One in a five-part series that covers the details around deploying a high available setup of Oracle ...

Oracle

Relying on Guaranteed Restore Points? Be careful!

Context Are you relying on guaranteed restore points (GRP) as a fallback plan for your migration or upgrade strategy? ...

Oracle

Moving APEX Applications Repository with APEXExport

Most likely you’ve landed here because you need to migrate APEX applications/workspaces from one database to another. ...

Oracle

Can Concurrent Processing Abort Help Automation and Predictable Maintenance?

On the surface concurrent processing (CP) looks simple; a new request is pending for a while, then it runs and is ...

Microsoft SQL Server

Graph Algorithms and Inference

Context If you’ve used Google Maps for directions or “friended” someone on Facebook, you’ve experienced graph theory. ...

Oracle

Resolving Data Guard ORA-16714: LogFileNameConvert Inconsistency

This seems like a simple message to fix, right? The parameter is different between the broker configuration and the ...

Oracle

AutoUpgrade: Plug Noarchive Non-CDB Database as Upgraded PDB

The Database AutoUpgrade utility has been slowly developing its capability to cover all possibilities of database ...

Oracle

Post-Mortem Analysis Tools: Hanganalyze

Post-mortem analysis tools: hanganalyze Editor’s note: This “post-mortem analysis” series consists of four posts in ...

Oracle

ORA-12537: TNS:connection closed – When Nothing Else Works!

When you’re sure all the TNS listener (SID_LIST_LISTENER in this case) services and db_domain are fine, but you still ...

Oracle

Opatchauto Failing On “CheckActiveFilesAndExecutables” during Prerequisite Check

Very recently, when applying the 2021 January CPU in a client environment, the following happened: The failure ...

Oracle

How to Use EM CLI to Verify Data Guard Configurations

EM CLI (Enterprise Manager Command Line Interface) allows users to access Enterprise Manager functionality from the ...

Cassandra

Mitigating the Problems Created by Tombstones

Got too many tombstones? This blog post will talk about how to deal with tombstones once you already have them. For ...

Oracle

Detect and Notify Linux Server Restart

When Oracle support performs maintenance for Exadata Cloud, communication can sometimes be a bit sparse. Typically, ...

Oracle

How To Rename Interval Partition with More Meaningful Name

Renaming oracle interval partitions for better readability When using interval partitioning, the database automatically ...

Oracle

AWS RDS: Read Oracle Traces from SQL*Plus

Today’s post is another dealing with AWS services. Let’s say you need to read trace files from RDS — how would you do ...

MySQL

Replicating MySQL to Snowflake with Kafka and Debezium—Part One: Data Extraction

What, Snowflake? Yes, Snowflake. While my core skills are based on the Oracle database, lately I’ve been working more ...

Oracle

SYSQL: SysAdmin Query Language

What is SYSQL? Recently Tanel Poder and I were discussing the use of Linux command pipelines for data analysis, and ...

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Understanding the Implications of Creating a New PDB Using CREATE_FILE_DEST

How to Perform (UDC) User-Defined Compactions in Cassandra

Post-Mortem Analysis Tools: Systemstate Dump

Enable Oracle Flash Cache on Red Hat Linux

Let’s deal with high read latencies in Cassandra

Five Best Practices for Setting Dispatchers on Shared Connections

Change Port Number in Common Object Service (COS) Naming Service for Reports Server Discovery

“The Cluster Upgrade State is [ROLLING PATCH]” with Correct Patch Level in all Nodes

How to Clean up Trace and Audit Files for Multiple Homes

Watch Out When Running Out of Disk Space With InnoDB Group Replication Cluster

Automating APEX Applications Backup

WebLogic Admin Console 12.2.1.4.0 Is Not Starting Due to Coherence GE 12.2.1.4.0

Post-Mortem Analysis Tools: ASH Dump

Part One: Deploying High Available Applications in Oracle Cloud Infrastructure: Preparing Your Environment

Relying on Guaranteed Restore Points? Be careful!

Moving APEX Applications Repository with APEXExport

Can Concurrent Processing Abort Help Automation and Predictable Maintenance?

Graph Algorithms and Inference

Resolving Data Guard ORA-16714: LogFileNameConvert Inconsistency

AutoUpgrade: Plug Noarchive Non-CDB Database as Upgraded PDB

Post-Mortem Analysis Tools: Hanganalyze

ORA-12537: TNS:connection closed – When Nothing Else Works!

Opatchauto Failing On “CheckActiveFilesAndExecutables” during Prerequisite Check

How to Use EM CLI to Verify Data Guard Configurations

Mitigating the Problems Created by Tombstones

Detect and Notify Linux Server Restart

How To Rename Interval Partition with More Meaningful Name

AWS RDS: Read Oracle Traces from SQL*Plus

Replicating MySQL to Snowflake with Kafka and Debezium—Part One: Data Extraction

SYSQL: SysAdmin Query Language

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