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

Licensing Oracle in a public cloud: the CPU calculation impact

Introduction: The Virtual Core Discrepancy Update 2015-May-11: Jean-Michael dug up another Amazon Web Services document ...

Cassandra

Cassandra 101 : Understanding what Cassandra Is

An Introduction to Apache Cassandra As some of you may know, in my current role at Pythian I am tackling OSDB, and ...

Microsoft SQL Server

Disable Lock Escalation in SQL Server

Introduction If a lot of rows or pages are locked, the SQL Server escalates to a table-level lock, to save resources. ...

Oracle

Making existing SQLPLUS Scripts 12c and Container DB (PDB) compatible

Oracle 12c introduces new catalog features including CDB_ dictionary views (which include a CON_ID column) superseding ...

Oracle

EM12c : Login to GUI with the correct password causes authentication failure

Troubleshooting an EM12c Login "Authentication Failed" Error So the other day I was trying to log in to my EM12c R4 ...

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

Weblogic patch rollback issues in Oracle EBS R12.2

When you try to rollback a weblogic patch in Oracle EBS R12.2, you might run into issues similar to below:

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 ...

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 ...

Cassandra

My thoughts on the resilience of Cassandra

The Resilience of Apache Cassandra: An Introduction This blog is a part 1 of a 2 in a series. This will be different ...

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 ...

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 ...

MySQL

fsfreeze in Linux

Suspending and Resuming Access A filesystem can be frozen using following command: # /sbin/fsfreeze -f /data Now if you ...

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 ...

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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

Licensing Oracle in a public cloud: the CPU calculation impact

Cassandra 101 : Understanding what Cassandra Is

Disable Lock Escalation in SQL Server

Making existing SQLPLUS Scripts 12c and Container DB (PDB) compatible

EM12c : Login to GUI with the correct password causes authentication failure

Troubleshooting a Multipath Issue

Weblogic patch rollback issues in Oracle EBS R12.2

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

Calculating business days in HiveQL

My thoughts on the resilience of Cassandra

Merging Apps Patches in Oracle EBS R12.2

Debugging high CPU usage using Perf Tool and Vmcore Analysis

Performance problems with Dynamic Statistics in Oracle 12c

fsfreeze in Linux

Benchmark: TokuDB vs. MariaDB / MySQL InnoDB compression

A (BIG) Trick Listing Windows updates using PowerShell

An introduction to extended data types in Oracle 12c

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