Blog | Pythian | Database (23)

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

Tracking ASM Metrics

Collecting ASM IO Metrics If you are an Oracle DBA, then it is quite likely that Oracle ASM is used as the storage ...

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 ...

Microsoft Azure

Three hidden Azure SQL database gotchas

Context Azure SQL Database is Microsoft’s Database as a Service (DBaaS) platform offering. It allows end users to ...

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

RMAN 11g : How to restore / duplicate to a more recent patchset

In an Oracle DBA's life, you'll be regularly asked to work on applying a new patchset on a database and then you will ...

Oracle

Migration of Oracle Database to Amazon RDS using Golden Gate

Migrating Oracle to Amazon RDS with Minimal Downtime Amazon RDS is a web service used to manage databases, like Oracle, ...

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. ...

MongoDB

Difference between Oracle's table and Mongo's collection

Roughly speaking, the notion of 'Tables' in Oracle is similar to MongoDB's 'Collections'. They are NOT identical ...

Oracle

asmcmd> a better "du"

I discovered ASM with a 10.1.0.3 RAC running on Linux Itanium and that was a big adventure. At this time there was no ...

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 ...

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 ...

Cloud

Permissions in Redshift administration

As with any database administration strategy, management of Redshift requires setting and revoking permissions. When ...

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 ...

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 ...

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

Tracking ASM Metrics

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

Three hidden Azure SQL database gotchas

Licensing Oracle in a public cloud: the CPU calculation impact

RMAN 11g : How to restore / duplicate to a more recent patchset

Migration of Oracle Database to Amazon RDS using Golden Gate

Cassandra 101 : Understanding what Cassandra Is

Disable Lock Escalation in SQL Server

Difference between Oracle's table and Mongo's collection

asmcmd> a better "du"

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

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

Weblogic patch rollback issues in Oracle EBS R12.2

Detecting source of MySQL Queries with comments

How to migrate a Database using GoldenGate

Permissions in Redshift administration

My thoughts on the resilience of Cassandra

Merging Apps Patches in Oracle EBS R12.2

Performance problems with Dynamic Statistics in Oracle 12c

fsfreeze in Linux

An introduction to extended data types in Oracle 12c

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