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Blog By Fahd Mirza Chughtai
Updated: 18 hours 9 min ago

From DBA to DBI

Mon, 2020-10-19 18:48

Recently Pradeep Parmer at AWS had a blog post about transitioning from DBA to DBI or in other words from database administrator to database innovator. I wonder what exactly is the difference here as any DBA worth his or her salt is an innovator in itself.

Administering a database is not about sleepily issuing backup commands or in terms of Cloud managed databases clicking here and there. Database administration has evolved over time just like other IT roles and is totally different what it was few years back. 

Regardless of the database engine you use, you have to have a breadth of knowledge about operating systems, networking, automation, scripting, on top of database concepts. With managed database services in cloud like AWS RDS or GCP Cloud SQL or Big Query many of the skills have become outdated but new ones have sprung up. That has always  been the case with DBA field. 

Taking the example of Oracle; what we were doing in Oracle 8i became obsolete in Oracle 11g and Oracle 19c  is a totally different beast. Oracle Exadata, RAC, various types of DR services, fusion middleware are in itself a new ballgame with every version. 

Even with managed database services, the role of DBA has become more involved in terms of migrations and then optimizing what's running within the databases from stopping the database costs going through the roof.

So the point here is that DBAs have always been innovators. They have always been trying to find out new ways to automate the management and healing of their databases. They always are under the pressure to eke out last possible optimization out of their system and that's still the case even if those databases are supposedly managed by cloud providers. 

With purpose built databases which are addressed different use case for different database technology the role of DBA has only become more relevant as they have to evolve to address all this graph, in-memory, and other cool nifty types of databases.

We have always been innovators my friend. 

Categories: DBA Blogs

What is Purpose Built Database

Mon, 2020-10-05 17:30

 In simple words, a general Database Engine is a big clunky piece of software with features for all the use cases, and its up to you to choose which features to use. Whereas in a purpose built database, you get a lean, specific database which is only suitable for the feature you want.

For instance, AWS offers 15 purpose-built database engines including relational, key-value, document, in-memory, graph, time series, and ledger databases. GCP also provides multiple databases types like Spanner, BigQuery etc. 

But the thing is that the one-size-fits-all monolithic databases aren't going anywhere. They are here to stay. A medium to large organization has way too many requirements and features to be used and having one database for every use case increases the footprint and cost. For every production database, there is a dev, test, and QA database so the foot print keeps increasing.

So the thing is that though having purpose built database notion is great it's not going to throw monilithic database out of the window. It just provides another option for the organization and they could just have a managed service for purpose built database for a specialized use case but for a general database requirement for OLTP and data warehouse, monilithic is still the way.

Categories: DBA Blogs

5 Important Steps Before Upgrading Oracle on AWS RDS

Sat, 2020-09-26 23:03

 Even though AWS RDS (relational database service) is a managed service which means that you won't have to worry about upgrades, patches and other tidbits, you still have the option of manually triggering the upgrade at time of your choice.

Upgrading an Oracle database is quite critical not only for the database itself but more importantly for the dependent applications. It's very important to try out any upgrade on RDS on a test representative system before hand to iron out any wrinkles and check the timings and any other potential issues. 

There are 5 important steps before upgrading Oracle on AWS RDS you can take to make this process more risk-free, speedy, and reliable:

  1. Check Invalid objects such as procedures, functions, packages etc in your database.
  2. Make a list of the objects which are still invalid and if possible delete them to remove clutter.
  3. Disable and remove audit logs if they are stored in database
  4. Convert dbms_jobs Jobs and other stuff to dbms_scheduler
  5. Take Snapshot of your production database right before you upgrade to speed up the upgrade process as then during upgrade only delta snapshot will be taken
I hope that helps.

Categories: DBA Blogs

Choice State in AWS Step Functions

Thu, 2020-09-17 02:47

Richly asynchronous server-less applications can be built by using AWS step functions. Choice State in AWS Step Functions is the newest feature which was long awaited.

In simply words, we define steps and their transitions and call it State Machine as a whole. In order to define this state machine, we use Amazon States Language (ASL). ASL is a JSON-based structured language that defines state machines and collections of states that can perform work (Task states), determines which state to transition to next (Choice state), and stops execution on error (Fail state). 

So if the requirement is to add a branching logic like if-then-else or case statement in our state transition, then Choice state comes handy. The choice state introduces various new operators into the ASL and the sky is now limit with the possibilities. Operators for choice state include comparison operators like Is Null, IsString etc, Existence operators like Ispresent, glob wildcards where you match some string and also variable string comparison.

Choice State enables developers to simplify existing definitions or add dynamic behavior within state machine definitions. This makes it easier to orchestrate multiple AWS services to accomplish tasks. Modelling complex workflows with extended logic is now possible with this new feature.

Now one hopes that AWS introduces doing it all graphically instead of dabbling into ASL.

Categories: DBA Blogs

CloudFormation Template for IAM Role with Inline Poicy

Tue, 2020-08-18 21:10
I struggled with this a bit to create a cloudformation template for IAM role with inline policy with IAM user as principal. So here it is as a quick reference:


    AWSTemplateFormatVersion: 2010-09-09
Parameters:
vTableName:
Type: String
Description: the tablename
Default: arn:aws:dynamodb:ap-southeast-2:1234567:table/test-table
vUserName:
Type: String
Description: New account username
Default: mytestuser
Resources:
DynamoRoleForTest:
Type: 'AWS::IAM::Role'
Properties:
AssumeRolePolicyDocument:
Statement:
- Effect: Allow
Principal:
AWS:
- !Sub 'arn:aws:iam::${AWS::AccountId}:user/${vUserName}'
Action:
- sts:AssumeRole
Path: /
Policies:
- PolicyName: DynamoPolicy
PolicyDocument:
Version: 2012-10-17
Statement:
- Effect: Allow
Action:
- dynamodb:BatchGet*
- dynamodb:DescribeStream
- dynamodb:DescribeTable
- dynamodb:Get*
- dynamodb:Query
- dynamodb:Scan
Resource: !Ref vTableName
I hope that helps. Thanks.
Categories: DBA Blogs

How to Read Docker Inspect Output

Fri, 2020-08-14 21:52

Here is quick easy set of instructions as how to read docker inspect output:

First you run the command:

docker inspect <image id> or <container id>

and then it outputs in JSON format. Your normally are interested in what exactly is in this docker image which you have just pulled from web or inherited in your new job. 

Now copy this JSON output and put it in VSCode or any of online JSON editor of your choice. For a quick glance, look at the node "ContainerConfig." This node tells you what exactly was run within the temporary container which was used to build this image such as CMD, EntryPoint etc. 

In addition to the above, following is the description of all the important bits of information found in Inspect command output:

  • ID: It's unique identifier of the image.
  • Parent: A link to the identifier of the parent image of this image. 
  • Container: The temporary container created when the image was built.
  • ContainerConfig: Contains what happened in that temporary container.
  • DockerVersion: Version of Docker used to create the image

Virtual Size: Image size in bytes.

I hope that helps.

Categories: DBA Blogs

Installing Docker on Amazon Linux 2

Thu, 2020-08-13 00:50
Installing docker on Amazon Linux 2 is full of surprises which are not easy to deal with. I just wanted to test something within a container environment, so spun up a new EC2 instance from the following AMI:

Amazon Linux 2 AMI (HVM), SSD Volume Type - ami-0ded330691a314693 (64-bit x86) / ami-0c3a4ad3dbe082a72 (64-bit Arm)

After this Linux instance came up, I just did yum update to get all the latest stuff:

 sudo yum update

All good so far.
Then I installed/checked yum-utils and grabbed the docker repo, and all good there:

[ec2-user@testf ~]$ sudo yum install -y yum-utils
Loaded plugins: extras_suggestions, langpacks, priorities, update-motd
Package yum-utils-1.1.31-46.amzn2.0.1.noarch already installed and latest version
Nothing to do

[ec2-user@testf ~]$ sudo yum-config-manager \
>     --add-repo \
>     https://download.docker.com/linux/centos/docker-ce.repo
Loaded plugins: extras_suggestions, langpacks, priorities, update-motd
adding repo from: https://download.docker.com/linux/centos/docker-ce.repo
grabbing file https://download.docker.com/linux/centos/docker-ce.repo to /etc/yum.repos.d/docker-ce.repo
repo saved to /etc/yum.repos.d/docker-ce.repo


Now, it's time to install docker:

[ec2-user@testf ~]$ sudo yum install docker-ce docker-ce-cli containerd.io
Loaded plugins: extras_suggestions, langpacks, priorities, update-motd
amzn2-core                                                                                                               | 3.7 kB  00:00:00
docker-ce-stable                                                                                                         | 3.5 kB  00:00:00
(1/2): docker-ce-stable/x86_64/primary_db                                                                                |  45 kB  00:00:00
(2/2): docker-ce-stable/x86_64/updateinfo                                                                                |   55 B  00:00:00
Resolving Dependencies
--> Running transaction check
---> Package containerd.io.x86_64 0:1.2.13-3.2.el7 will be installed
--> Processing Dependency: container-selinux >= 2:2.74 for package: containerd.io-1.2.13-3.2.el7.x86_64
---> Package docker-ce.x86_64 3:19.03.12-3.el7 will be installed
--> Processing Dependency: container-selinux >= 2:2.74 for package: 3:docker-ce-19.03.12-3.el7.x86_64
--> Processing Dependency: libcgroup for package: 3:docker-ce-19.03.12-3.el7.x86_64
---> Package docker-ce-cli.x86_64 1:19.03.12-3.el7 will be installed
--> Running transaction check
---> Package containerd.io.x86_64 0:1.2.13-3.2.el7 will be installed
--> Processing Dependency: container-selinux >= 2:2.74 for package: containerd.io-1.2.13-3.2.el7.x86_64
---> Package docker-ce.x86_64 3:19.03.12-3.el7 will be installed
--> Processing Dependency: container-selinux >= 2:2.74 for package: 3:docker-ce-19.03.12-3.el7.x86_64
---> Package libcgroup.x86_64 0:0.41-21.amzn2 will be installed
--> Finished Dependency Resolution
Error: Package: containerd.io-1.2.13-3.2.el7.x86_64 (docker-ce-stable)
           Requires: container-selinux >= 2:2.74
Error: Package: 3:docker-ce-19.03.12-3.el7.x86_64 (docker-ce-stable)
           Requires: container-selinux >= 2:2.74
 You could try using --skip-broken to work around the problem
 You could try running: rpm -Va --nofiles --nodigest


and it failed. 

So googled the error Requires: container-selinux and every stackoverflow post and blogs say to download the new rpm from some centos or similar mirror but it simply doesn't work, no matter how hard you try. 

Here is the ultimate best solution which enabled me to get docker installed on Amazon Linux 2 on this EC2 server:

sudo rm /etc/yum.repos.d/docker-ce.repo

sudo amazon-linux-extras install docker

sudo service docker start

[ec2-user@~]$ docker --version

Docker version 19.03.6-ce, build 369ce74


That's it. I hope that helps.
Categories: DBA Blogs

Quick Intro to BOTO3

Mon, 2020-08-10 03:37

 I just published my very first tutorial video on youtube which lists down a quick introduction to AWS BOTO3 with a step by step walkthrough of a simple program. Please feel free to subscribe to my channel. Thanks. You can find video here.

Categories: DBA Blogs

Checklist While Troubleshooting Workload Errors in Kubernetes

Fri, 2020-08-07 02:21

 Following is the checklist while troubleshooting workload/application errors in Kubernetes:

1- First check how many nodes are there

2- What namespaces are present

3- In which namespace , the faulty application is

4- Now check faulty app belongs to which deployment

5- Now check which replicaset (if any) is party of that deployment

6- Then check which pods are part of that replicaset

7- Then check which services are part of that namespace

8- Then check which service correspond to the deployment where our faulty application is 

9- Then make sure label selectors in deployment to pod template are correct

10- Then ensure label selector in service to deployment are correct.

11- Then check that servicename if referred in any deployment is correct. For example, webserver pod is referring to database host (which will be the servicename of database) in env of pod template is correct.

12- Then check that ports are correct in clusterIP or nodeport services. 

13- Check if the status of pod is running

14- check logs of pods and containers

I hope that helps and feel free to add any step or thought in the comments. Thanks.

Categories: DBA Blogs

Different Ways to Access Oracle Cloud Infrastructure

Thu, 2020-08-06 09:00

This is a quick jot down of different ways you can access the ever-improving Oracle Cloud Infrastructure (OCI). Most types of Oracle Cloud Infrastructure resources have a unique, Oracle-assigned identifier called an Oracle Cloud ID (OCID).

You can access Oracle Cloud Infrastructure using the Console (a browser-based interface) or the REST API. To access the Console, you must use a supported browser. You can go to the sign-in page. You will be prompted to enter your cloud tenant, your user name, and your password. The Oracle Cloud Infrastructure APIs are typical REST APIs that use HTTPS requests and responses.

All Oracle Cloud Infrastructure API requests must be signed for authentication purposes. All Oracle Cloud Infrastructure API requests must support HTTPS and SSL protocol TLS 1.2. Oracle Cloud Infrastructure provides a number of Software Development Kits (SDKs) and a Command Line Interface (CLI) to facilitate development of custom solutions.

Software Development Kits (SDKs) Build and deploy apps that integrate with Oracle Cloud Infrastructure services. Each SDK provides the tools you need to develop an app, including code samples and documentation to create, test, and troubleshoot. In addition, if you want to contribute to the development of the SDKs, they are all open source and available on GitHub.

  • SDK for Java
  • SDK for Python
  • SDK for TypeScript and JavaScript
  • SDK for .NET
  • SDK for Go
  • SDK for Ruby

Command Line Interface (CLI) The CLI provides the same core capabilities as the Oracle Cloud Infrastructure Console and provides additional commands that can extend the Console's functionality. The CLI is convenient for developers or anyone who prefers the command line to a GUI.

Categories: DBA Blogs

Oracle 11g on AWS RDS Will Be Force Upgraded in Coming Months

Thu, 2020-08-06 00:51
To make a long story short: If you have Oracle 11g running on AWS RDS, then start thinking, planning, and implementing it's upgrade to a later version, preferably Oracle 19c. 

This is what AWS has to say about this:

Oracle has announced the end date of support for Oracle Database version 11.2.0.4 as December 31, 2020, after which Oracle Support will no longer release Critical Patch Updates for this database version. Amazon RDS for Oracle will end support for Oracle Database version 11.2.0.4 Standard Edition 1 (SE1) for License Included (LI) model on October 31, 2020. For the Bring Your Own License (BYOL) model, Amazon RDS for Oracle will end the support for Oracle Database version 11.2.0.4 for all editions on December 31, 2020. All 11.2.0.4 SE1 LI instances will be automatically upgraded to 19c starting on November 1, 2020. Likewise, the 11.2.0.4 BYOL instances will be automatically upgraded to 19c starting on January 1, 2021. We highly recommend you upgrade your existing Amazon RDS for Oracle 11.2.0.4 DB instances and validate your applications before the automatic upgrades begin. 

The bit which probably would apply to most of enterprise customers who are running Oracle 11g with BYOL license is this:

January 1, 2021Amazon RDS for Oracle starts automatic upgrades of DB instances restored from snapshots to 19c
Instead of leaving to the last minute, its better to upgrade it sooner. There are lots of things which need to be taken into consideration for this upgrade within and outside of the database. If you need any hand with that, feel free to reach out.
Categories: DBA Blogs

Oracle Cloud's Beefed Up Security

Wed, 2020-08-05 01:23
During the first few months of the COVID-19 pandemic, many organizations expected a slowdown in their digital transformation efforts. But surprisingly, things haven't slowed down in many places instead, many enterprises accelerated their use of cloud-based services to help them manage and address emerging priorities in the new normal, which includes a distributed workforce and new digital strategies. 

More and more companies, especially those in regulated industries, want to adopt the latest cloud technologies, but they often face barriers due to strict data privacy or compliance requirements. As cloud adoption grows, we’re seeing exponential growth in cloud resources. With this we’re also seeing growth in permissions, granted to humans and workloads, to access and change those resources. This introduces potential risks, including the misuse of privileges, that can compromise your organization’s security.

To mitigate these risks, ideally every human or workload should only be granted the permissions they need, at the time they need them. This is the security best practice known as “least privilege access.” Oracle Cloud Infrastructure Identity and Access Management (IAM) lets you control who has access to your cloud resources. You can control what type of access a group of users have and to which specific resources. 

Compartments are a fundamental component of Oracle Cloud Infrastructure for organizing and isolating your cloud resources. You use them to clearly separate resources for the purposes of measuring usage and billing, access (through the use of policies), and isolation (separating the resources for one project or business unit from another). A common approach is to create a compartment for each major part of your organization. 

The first step in establishing least privilege is understanding which permissions a user has today and which have been used recently. Then, you need to understand which permissions this user is likely to need in the future, so you avoid getting into a manually intensive trial-and-error loop of assigning incremental permissions. Once you have that, you need to decide how to construct your identity and access management (IAM) policies so that you can reuse roles across several compartments.

In the Console, you view your cloud resources by compartment. This means that after you sign in to the Console, you'll choose which compartment to work in (there's a list of the compartments you have access to on the left side of the page). Notice that compartments can be nested inside other compartments. The page will update to show that compartment's resources that are within the current region. If there are none, or if you don't have access to the resource in that compartment, you'll see a message.

This experience is different when you're viewing the lists of users, groups, dynamic groups, and federation providers. Those reside in the tenancy itself (the root compartment), not in an individual compartment.

As for policies, they can reside in either the tenancy or a compartment, depending on where the policy is attached. Where it's attached controls who has access to modify or delete it. 
Categories: DBA Blogs

Oracle Cloud for Existing Oracle Workloads

Mon, 2020-07-27 19:57
As the technology requirements of your business or practice grow and change over time, deploying business-critical applications can increase complexity and overhead substantially. This is where Oracle Cloud can assist the organization in an optimum and cost effective way.


To help manage this ever-growing complexity, organizations need to select a cloud solution which is similar to their existing on-prem environments. Almost all the serious enterprise outfits are running some sort of Oracle workload and it only makes sense for them to select Oracle cloud in order to leverage what they already know in a better and modern way. And they can utilize this architecture best practices to help you build and deliver great solutions.

Cost management, operational excellence, performance efficiency, reliability, and security are hallmarks of Oracle cloud plus some more. Oracle databases are already getting complex and autonomous. They are now harder to manage and that is why it only make sense to migrate them over to the Oracle cloud and let Oracle handle all the nitty gritty.

Designing and deploying a successful workload in any environment can be challenging. This is especially true as agile development and DevOps/SRE practices begin to shift responsibility for security, operations, and cost management from centralized teams to the workload owner. This transition empowers workload owners to innovate at a much higher velocity than they could achieve in a traditional data center, but it creates a broader surface area of topics that they need to understand to produce a secure, reliable, performant, and cost-effective solution.

Every company is on a unique cloud journey, but the core of Oracle is same.



Categories: DBA Blogs

ADB-ExaC@C ? What in the Heck Oracle Autonomous Database is?

Sat, 2020-07-25 23:51
ADB-ExaC@C ? I would love to see the expressions on the face of Corey Quinn when he learns about this naming convention used by Oracle for their Exadata in Cloud offering.

Since Oracle 10g, we have been hearing about self-managed, self-healing, and self-everything Oracle database. Oracle 10g was touted as self-healing one and if you have managed Oracle 7,8i,9i, this was infarct true how much pain 10g had taken away.

But 10g was far from self-managed or autonomous in other words. Autonomous means that you wouldn't have to manage anything and database would run by itself. Once you switch it on (or it could even that by itself), it would be on it's own. This wasn't the case with 10g, 11g, 12c, 18c, etc. Database administrators were still in vogue.

With everything moving over to cloud, is that still the case? Or in other words, with this autonomous band wagon of Oracle plus their cloud offerings, is autonomous database a reality now?

So what in the heck Oracle autonomous database is? Autonomous Database delivers a machine-learning driven, self-managed database capability that natively builds in Oracle’s extensive technology stack and best practices for self-driving, self-securing and self-repairing operation.

Oracle says that their Autonomous Database is completely self-managed, allowing you to focus on business innovations instead of technology and is consumed in a true pay-per-use subscription model to lower operational cost. Yes, we have heard almost similar claims with previous versions, but one main difference here is that this one is in the cloud.

Well, if you have opted for Exadata in Oracle's cloud then its true up to a great extent. Oracle Autonomous Database on Exadata Cloud@Customer (ADB-ExaC@C) is here and as Oracle would be managing it, you wouldn't have to worry about its management. But if its autonomous why would anyone including Oracle would manage it? Shouldn't it be managing itself?

So this autonomous ADB-ExaC@C provides you something Architectural Identicality which can be easily achived by anything non-autonomous. They say its elastic as it can auto scale up and down. I think AWS Aurora, GCP Big Query is doing that for some time now. Security patching, upgrades, backups, are all behind the scene and automated for this ADB-ExaC@C. I am still at loss as what really makes it autonomous here.

Don't get me wrong. I am huge fan of Exadata despite of its blood-curdling price. Putting Exadata in Cloud and offering it as a service is a great idea too as this would enable many businesses to use it. My question is simple: ADB-ExaC@C is a managed service for sure, but what makes it autonomous?
Categories: DBA Blogs

What's Different About Oracle's Cloud

Sat, 2020-07-25 23:28
Cloud infrastructure is the foundation to powering your SaaS applications. The cloud infrastructure supporting a SaaS application is the engine that provides the security, scale, and performance for your business applications. It includes the database, operating systems, servers, routers, and firewalls (and more) required to process billions of application transactions every day.


In the words of Larry Ellison, "The main economic benefit of Oracle’s Gen 2 Cloud Infrastructure is its autonomous capability, which eliminates human labor for administrative tasks and thus reduces human error. That capability is particularly important in helping prevent data theft against increasingly sophisticated, automated hacks."

But with an outdated, overly complex ERP system, the organization found it a challenge to efficiently provide financial information. For one thing, its heavily manual processes resulted in a lack of confidence in data, making it hard to drive productivity and service improvements. By insisting on zero customization of its Oracle Cloud applications, organizatons across the world ensure that regular updates are simple and that its processes are integrated and scalable. As a result, the utility has shortened its order lead times significantly, reduced customer complaints, and boosted overall customer satisfaction levels.

Oracle’s second-generation cloud offers autonomous operations that eliminate human error and provide maximum security, all while delivering truly elastic and serverless services with the highest performance—available globally both in the public cloud and your data centers.
Categories: DBA Blogs

ERP in Oracle's Cloud

Sat, 2020-07-25 23:27
Gain resilience and agility, and position yourself for growth. Oracle Fusion Cloud ERP gives you the power to adapt business models and processes quickly so you can reduce costs, sharpen forecasts, and innovate more.


Many companies have started to migrate to Cloud. Zoom selects Oracle as a cloud infrastructure provider for its core online meeting service. Zoom deploys Oracle Cloud within hours; enables millions of meeting participants within weeks.

Oracle Cloud is a Generation 2 enterprise cloud that delivers powerful compute and networking performance and includes a comprehensive portfolio of infrastructure and platform cloud services. Built from the ground up to meet the needs of mission-critical applications, Oracle Cloud supports all legacy workloads while delivering modern cloud development tools, enabling enterprises to bring their past forward as they build their future.

Oracle's generation 2 Cloud is the only one built to run Oracle Autonomous Database, the industry's first and only self-driving database. Oracle Cloud offers a comprehensive cloud computing portfolio, from application development and business analytics to data management, integration, security, artificial intelligence (AI), and blockchain. Oracle customers are using Oracle Autonomous Database to transform their businesses by redefining database management through machine learning and automation.

Reduce operational costs by up to 90% with a multimodel converged database and machine learning-based automation for full lifecycle management. Oracle Autonomous Database runs natively on Oracle Cloud Infrastructure while providing workload-optimized cloud services for transaction processing and data warehousing. Oracle Database is the market leader and ranks #1 in the 2019 Gartner Critical Capabilities for Operational Database Management Systems report.

You can protect sensitive and regulated data automatically, patch your database for security vulnerabilities, and prevent unauthorized access—all with Oracle Autonomous Database. You can detect and protect from system failures and user errors automatically and provide failover to standby databases with zero data loss. Autonomous Data Warehouse is a cloud database service optimized for analytical processing. It automatically scales compute and storage, delivers fast query performance, and requires no database administration.

Categories: DBA Blogs

Database Management in Oracle Cloud

Sat, 2020-07-25 23:27
Autonomous Data Warehouse
Oracle Autonomous Data Warehouse Cloud Service is a fully automated, high-performance, and elastic service. You will have all of the performance of market-leading Oracle Database in a fully automated environment that is tuned and optimized for data warehouse workloads.


Autonomous Transaction Processing
Oracle Autonomous Transaction Processing is a fully automated database service tuned and optimized for transaction processing or mixed workloads with the market-leading performance of Oracle Database. The service delivers a self-driving, self-securing, self-repairing database service that can instantly scale to meet demands of mission-critical applications.

Database Cloud Service: Bare Metal
The dense I/O configuration consists of a single Oracle 11g, 12c, or 18c Database instance on 2 OCPUs, with the ability to dynamically scale up to 52 OCPUs without downtime. Available storage configurations range from 5.4 to 51.2 TB of NVMe SSD local storage, with 2- and 3-way mirroring options available.

Database Cloud Service: Virtual Machine
The virtual machine configurations consists of a single Oracle 11g, 12c, or 18c Database instance. Choose from a single OCPU virtual machine with 15 GB of RAM up to a RAC-enabled virtual machine with 48 OCPUs with over 600 GB of RAM. Storage configurations range from 256 GB to 40 TB.

Exadata Cloud Service
Oracle Exadata Cloud Service enables you to run Oracle Databases in the cloud with the same extreme performance and availability experienced by thousands of organizations which have deployed Oracle Exadata on premise. Oracle Exadata Cloud Service offers a range of dedicated Exadata shapes.

Exadata Cloud@Customer
Oracle Exadata Cloud@Customer is a unique solution that delivers integrated Oracle Exadata hardware and Oracle Cloud Infrastructure software in your data center with Oracle Exadata infrastructure managed by Oracle experts. Oracle Exadata Cloud@Customer is ideal for customers who desire cloud benefits but cannot yet move their databases to the public cloud.

Oracle NoSQL Database Cloud Service
A NoSQL Database Cloud Service with on-demand throughput and storage-based provisioning that supports document, columnar, and key-value data models, all with flexible transaction guarantees.

Oracle MySQL Database Service
MySQL Database Service is a fully managed database service that enables organizations to deploy cloud native database applications using the world’s most popular open source database. It is 100% developed, managed, and supported by the MySQL Team.
Categories: DBA Blogs

ORA-1652

Mon, 2020-07-06 22:01
If you are wondering what might be the reasons to have ORA-1652, then you can use the following query to get the idea:



select sql_id,  sum(temp_space_allocated)/1024/1024

from dba_hist_active_sess_history

where sample_time between timestamp '2020-06-25 19:30:00' and timestamp '2020-06-25 20:00:00'

group by sql_id

order by 2 desc;

Also check out the control real-time monitoring of the sessions and v$tempseg_usage, maybe some other query who is using temp and rapidly filling it.

Also check this view V$TEMPSEG_USAGE which describes temporary segment usage.
Categories: DBA Blogs

FiveTran Auth Error in Connecting Oracle RDS Database

Mon, 2020-07-06 21:49
Fivetran toolpromises to reduce technical debt with scalable connectors managed from source to destination. Model your business logic in any destination using SQL, the industry standard. Change data capture delivers incremental updates for all your sources. Built with analysts in mind, our connectors allow data teams to concentrate on asking the right questions.


I was trying to connect from fivetran to Oracle database hosted on AWS RDS and was getting Auth error while connecting through ssh tunnel. I was following fivetran instructions to create ssh user, give its rights set up the keys etc but even then Auth error was appearing.

The solution is to allow fivetran user and its group in /etc/ssh/sshd_config file and restart the ssh daemon.

Only then you would be able to connect.


Categories: DBA Blogs

Oracle Cloud is Rich with Spatial

Fri, 2020-05-29 03:47
Spatial is the technology of future. Massive amount of data will be generated, cleansed and stored. Oracle's autonomous databases in Oracle's cloud are ready to take on the challenge with a bang with a solid database offering, which is time tested.

Machine learning and graph are just the elementary building blocks of this spatial offering from Oracle.

Oracle Database includes native spatial data support, rich location query and analysis, native geocoding and routing, and map visualization, to support location-enabled business intelligence applications and services.With a network data model, raster and gridded data analysis, 3D and point cloud operations, a location tracking server, and topology management, Oracle Database provides a comprehensive platform for GIS.

It’s easy for developers to add spatial capabilties to applications – with standards-based SQL and Java APIs, JSON and REST support, and integration with Database tools, Oracle Business Intelligence, and Applications. With dramatically fast spatial index and query performance, Exadata integration, and support for Database features such as partitioning, security, distributed transactions, and sharding,

Oracle Database powers the most demanding, large scale geospatial applications – from cloud-based location services to transportation, utilities, agriculture, asset managmeent, LiDAR analysis, energy and natural resouces, and planning.

With 12.2, Oracle continues to deliver the most advanced spatial and graph database platform for applications from geospatial and location services to Internet of Things, social media, and big data.

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