Blog | Pythian (35)

Oracle

Performance issues with the Sequence NEXTVAL call

Is SELECTing from a sequence your Oracle Performance Problem? The answer to that question is: it might be! You wouldn't ...

Oracle

ORA-28043: Invalid bind credentials for DB-OID connection

Problem Statement Have you ever encountered this error connecting to a DB using global authentication against OID? Was ...

Oracle

The power of the Oracle Database Proxy authenticated connections

We recently received this inquiry from a client: "C an an Oracle database account support two passwords at once so we ...

Oracle

OLTP type 64 compression and 'enq: TX - allocate ITL entry' on Exadata

Recently we've seen a strange problem with the deadlocks at the client database on Exadata, Oracle version 11.2.0.4. ...

Oracle

Using the ILOM for troubleshooting on ODA

I worked on root cause analysis for a strange node reboot on client's Oracle Database Appliance yesterday.

Oracle

Recovering an Oracle Database with Missing Redo

Background I ran into a situation where we needed to recover from an old online backup which (due to some issues with ...

Oracle

What does "backup restore throttle speed" wait mean?

After migrating a 10g database to 11g, I asked the Application team to start their tests in order to validate that ...

Oracle

Slimming Down Oracle RAC 12c's resource footprint

I've been working on setting up a demo for my upcoming presentation on application continuity at RMOUG training days ...

Oracle

Oracle Database 12c Patching: DBMS_QOPATCH, OPATCH_XML_INV, and datapatch

Background Oracle Database 12c brings us many new features including: the long needed ability to run OPatch and query ...

Cassandra

Monitoring Cassandra with Grafana and Influx DB

Hello, In this post I will explain how to set up Cassandra monitoring with influxDB and Grafana. This can also be used ...

Oracle

Oracle Database: script to purge aud$ table using dbms_audit_mgmt package

With an increase in requirements on database security, database auditing is part of most production databases nowadays. ...

Oracle

Alter session kill on steroids

Efficiently Handling Persistent "Killed" Sessions in Oracle Perhaps you have encountered something like this: A session ...

Infra Ops

Troubleshooting a Multipath Issue

Multipathing allows for the configuration of multiple paths from servers to storage arrays, providing I/O failover and ...

Oracle

Building a MariaDB Galera Cluster with Docker

There’s been a lot of talk about Docker for running processes in isolated userspace (or the cloud for that matter) ...

MySQL

Detecting source of MySQL Queries with comments

Background As a MySQL DBA I already know the data changes that happen on my system. I have logs for that. However, it’s ...

Oracle

How to migrate a Database using GoldenGate

There are many ways to migrate a database from A server to B server like Datapump, RMAN,etc. Using the combination of ...

Oracle

Fixing Windows RAC listener to listen on IP address of Hostname

Background Recently, there was an issue after a node was added to an existing Windows RAC cluster. After everything was ...

Microsoft SQL Server

SQL Server and OS Error 1117, Error 9001, Error 823

Introduction Along with other administrators, life of us, the DBAs are no different but full of adventure. At times, we ...

Data Warehouse

Calculating business days in HiveQL

Background One of the common tasks in data processing is to calculate the number of days between two given dates. You ...

Oracle

Merging Apps Patches in Oracle EBS R12.2

It’s public knowledge that the traditional patching tool in Oracle EBS “adpatch” is replaced with “adop” utility. It’s ...

How SQL Server browser service Works

Some of you may wonder the role SQL browser service plays in the SQL Server instance. In this blog post, I’ll provide ...

Microsoft SQL Server

SQL Server replication quick tips

There is a time in every SQL Server DBA career where a mail came in with a “replication is not working, please check” ...

Microsoft SQL Server

SQL server error: 18056, Severity: 20, State: 29

Introduction Howdy everyone, One of the most frequent error messages I come across when dealing with SQL Server, ...

Infra Ops

Debugging high CPU usage using Perf Tool and Vmcore Analysis

There are several tools and technologies available to debug deeper into high CPU utilization in a system; perf, sysrq, ...

Oracle

Performance problems with Dynamic Statistics in Oracle 12c

Test Case Preparation I’ve been making some tests recently with the new Oracle 12.1.0.2 In-Memory option and have been ...

Oracle

12c: How to Restore/Recover a Small Table in a Large Database

Introduction As a DBA, you will receive requests from developers or users, indicating that they deleted some data in a ...

MySQL

Benchmark: TokuDB vs. MariaDB / MySQL InnoDB compression

Introduction As the amount of data companies are interested in collecting grows, life becomes all the more difficult ...

Infra Ops

A (BIG) Trick Listing Windows updates using PowerShell

If you (like me) are using Microsoft.Update.Session for listing the installed windows updates, you might be surprised ...

Oracle

An introduction to extended data types in Oracle 12c

Introduction One of the lesser known new features that comes as a boon to many developers and DBAs is the provision of ...

Microsoft SQL Server

Data profile: better knowing your data

Problem Statement Have you ever needed to start a new data analysis project or create a report for the business users ...

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Using Multi-Agent Reasoning for NLP-to-SQL

As data-driven decision-making becomes essential, access to that data shouldn’t require deep technical ...

Analytics

Becky's BI Apps Corner: OBIA 11.1.1.10.2

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Analytics

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Performance issues with the Sequence NEXTVAL call

ORA-28043: Invalid bind credentials for DB-OID connection

The power of the Oracle Database Proxy authenticated connections

OLTP type 64 compression and 'enq: TX - allocate ITL entry' on Exadata

Using the ILOM for troubleshooting on ODA

Recovering an Oracle Database with Missing Redo

What does "backup restore throttle speed" wait mean?

Slimming Down Oracle RAC 12c's resource footprint

Oracle Database 12c Patching: DBMS_QOPATCH, OPATCH_XML_INV, and datapatch

Monitoring Cassandra with Grafana and Influx DB

Oracle Database: script to purge aud$ table using dbms_audit_mgmt package

Alter session kill on steroids

Troubleshooting a Multipath Issue

Building a MariaDB Galera Cluster with Docker

Detecting source of MySQL Queries with comments

How to migrate a Database using GoldenGate

Fixing Windows RAC listener to listen on IP address of Hostname

SQL Server and OS Error 1117, Error 9001, Error 823

Calculating business days in HiveQL

Merging Apps Patches in Oracle EBS R12.2

How SQL Server browser service Works

SQL Server replication quick tips

SQL server error: 18056, Severity: 20, State: 29

Debugging high CPU usage using Perf Tool and Vmcore Analysis

Performance problems with Dynamic Statistics in Oracle 12c

12c: How to Restore/Recover a Small Table in a Large Database

Benchmark: TokuDB vs. MariaDB / MySQL InnoDB compression

A (BIG) Trick Listing Windows updates using PowerShell

An introduction to extended data types in Oracle 12c

Data profile: better knowing your data

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