Monday, October 9, 2017
Tuesday, March 24, 2015
Monday, October 6, 2014
Tuesday, July 22, 2014
System Administration/ Unix ScriptsMonitoring CPU output on Solaris and report in excel
tail and grep tools for DBA
Good Linux / Unix System Admin Commands for DBA
Check Hardware configuration of Linux Box
grep next / previous few lines of key word
Collect and report Linux System Activity Information with sar
cpu vs core vs sockets - calculation
Useful Shell commands and Scripts
RAC , ASM
SQL, PL/SQL , Automation
Move table and dependant LOB to other tablespace
Converting Numbers to millions and more ...
Historical growth of tablespace
for the 1st time database users - How to start the database
Adding name of the table in the output from multiple tables
Performance TuningExplain plan for SQLs
Locks and Waits
Analyzing a Statspack Report
Schedule snapshot collection in Statspack reports
Local Indexes for Partitioning
Check maximum memory utilization for oracle Database
Identify Top CPU / Memory intensive process and map to corresponding Oracle Process/ Session
Identify Oracle Process ID and related SQL
check fragmentation of table
Identify session waiting on enq: TX - row lock contention
Identify Sessions using an Object/ many Objects
Detection of Deadlock errors and investigation
GeneralOracle DBA Interview Questions
Oracle 11gr2 Database Reference
Configure FGA ( Fine Grain Auditing)
Favorite Oracle Metalink Notes
Renaming table: How does that affect the associated objects?
How to read Alert and Listener logs from SQLPLUS
Resize datafile and enable autoextend
Check Object Inventory & recently created objects
Life Without AWR
Stopping Oracle Services on Windows
Startup failure ORA-00845: MEMORY_TARGET not supported on this system
Check Tablespace Utilisation
WeblogicFAILED_NOT_RESTARTABLE in WebLogic Server 11g
Wednesday, November 3, 2010
This page captures the brief view of cloud services
Following are some commonly used terms:
Cloud Computing (wikipedia)
Broadly, servers, virtualisation software, networking and storage are required to form cloud. Following components form a complete cloud:
· Scalable, powerful and cheap servers
· Integrated, virtualised, and hugely scalable storage
· Virtualised 10GbE network switching infrastructure
· Fibre Channel over Ethernet capability to link servers and storage across Ethernet
· Disaster recovery capabilities
· Service-quality tracking and control
· Management of a virtualised data centre
Cloud architecture was used by Web 2.0 but due to changing economies more enterprises are adopting it due to its pay-per-usage model. Virtualization enables cloud to offer more services than cloud could do without
virtualization, e.g. PaaS.
Smaller cloud than a conventional one. It is cloud like IT systems within a firewall offering similar services, but
to a closed internal network. A private cloud can be expanded to contain resources from within an enterprize (on premise) as well as from external cloud (off premise).
Cloud available to anyone over the internet. Examples are, Amazon Elastic Compute Cloud (EC2), IBM's Blue Cloud, Sun Cloud, Google AppEngine and Windows Azure Services Platform.
Entity providing cloud services to others.
Entity consuming a cloud service.
There are various cloud services:
Infrastructure as a Service (IaaS) (wikipedia)
Service user gets infrastructure to run application without spending on hardware (saving CapEx),
e.g. a configured VM.
e.g. a configured VM.
Platform as a Service (PaaS) (wikipedia)
Service user gets platform to develop/run applications on cloud without spending on cloud infrastructure, e.g. Azure, Google AppEngine, Force.com
Software as a Service (SaaS) (wikipedia)
Service user gets a software to use without spending on software license and hardware, e.g. eXpresso, Google Apps
Storage as a Service (STaaS)
Service user gets storage to use without spending on storage hardware, e.g. Synaptic, Mozy, Box.net, also T-systems, BT, etc offer storage services for enterprizes.
NOTE: Synaptic service is offered by AT&T, a telco. It makes perfect sense for a telco to offer such a service because they already have network to deliver the service. So, they can offer better value for money for the subscribers.