Chainlink: Node Of The Decentralized Oracle Network & Off-chain

Chainlink 

Chainlink expands the capabilities of smart contracts by enabling access to real-world data and off-chain computation while maintaining the security and reliability guarantees inherent to blockchain technology.

This repo contains the Chainlink core node, operator UI and contracts. The core node is the bundled binary available to be run by node operators participating in a decentralized oracle network. All major release versions have pre-built docker images available for download from the Chainlink dockerhub. If you are interested in contributing please see our contribution guidelines. If you are here to report a bug or request a feature, please check currently open Issues. For more information about how to get started with Chainlink, check our official documentation. Resources for Solidity developers can be found in the Chainlink Hardhat Box.

Community

Chainlink has an active and ever growing community. Discord is the primary communication channel used for day to day communication, answering development questions, and aggregating Chainlink related content. Take a look at the community docs for more information regarding Chainlink social accounts, news, and networking.

Build Chainlink

1. Install Go 1.18, and add your GOPATH's bin directory to your PATH
   • Example Path for macOS export PATH=$GOPATH/bin:$PATH & export GOPATH=/Users/$USER/go
2. Install NodeJS & Yarn. See the current version in package.json at the root of this repo under the engines.node key.
   • It might be easier long term to use nvm to switch between node versions for different projects. For example, assuming $NODE_VERSION was set to a valid version of NodeJS, you could run: nvm install $NODE_VERSION && nvm use $NODE_VERSION
3. Install Postgres (>= 11.x).
   • You should configure Postgres to use SSL connection (or for testing you can set ?sslmode=disable in your Postgres query string).
4. Ensure you have Python 3 installed (this is required by solc-select which is needed to compile solidity contracts)
5. Download Chainlink: git clone https://github.com/smartcontractkit/chainlink && cd chainlink
6. Build and install Chainlink: make install
   • If you got any errors regarding locked yarn package, try running yarn install before this step
   • If yarn install throws a network connection error, try increasing the network timeout by running yarn install --network-timeout 150000 before this step
7. Run the node: chainlink help

For the latest information on setting up a development environment, see the Development Setup Guide.

Mac M1/ARM64 [EXPERIMENTAL]

Chainlink can be experimentally compiled with ARM64 as the target arch. You may run into errors with cosmwasm:

# github.com/CosmWasm/wasmvm/api
ld: warning: ignoring file ../../../.asdf/installs/golang/1.18/packages/pkg/mod/github.com/!cosm!wasm/wasmvm@v0.16.3/api/libwasmvm.dylib, building for macOS-arm64 but attempting to link with file built for macOS-x86_64
Undefined symbols for architecture arm64:# github.com/CosmWasm/wasmvm/api
ld: warning: ignoring file ../../../.asdf/installs/golang/1.18/packages/pkg/mod/github.com/!cosm!wasm/wasmvm@v0.16.3/api/libwasmvm.dylib, building for macOS-arm64 but attempting to link with file built for macOS-x86_64
Undefined symbols for architecture arm64:

In this case, try the following steps:

1. git clone git@github.com:mandrean/terra-core.git
2. cd terra-core; git checkout feat/multiarch
3. make install; cd ..
4. go work init /path/to/chainlink
5. go work use /path/to/terra-core

Ethereum Node Requirements

In order to run the Chainlink node you must have access to a running Ethereum node with an open websocket connection. Any Ethereum based network will work once you've configured the chain ID. Ethereum node versions currently tested and supported:

[Officially supported]

• Parity/Openethereum
• Geth
• Nethermind

[Unofficially supported]

• Besu
• Erigon

We cannot recommend specific version numbers for ethereum nodes since the software is being continually updated, but you should usually try to run the latest version available.

Running a local Chainlink node

NOTE: By default, chainlink will run in TLS mode. For local development you can disable this by setting the following env vars:

CHAINLINK_DEV=true
CHAINLINK_TLS_PORT=0
SECURE_COOKIES=false

Alternatively, you can generate self signed certificates using tools/bin/self-signed-certs or manually.

To start your Chainlink node, simply run:

chainlink node start

By default this will start on port 6688. You should be able to access the UI at http://localhost:6688/.

Chainlink provides a remote CLI client as well as a UI. Once your node has started, you can open a new terminal window to use the CLI. You will need to log in to authorize the client first:

chainlink admin login

(You can also set ADMIN_CREDENTIALS_FILE=/path/to/credentials/file in future if you like, to avoid having to login again).

Now you can view your current jobs with:

chainlink jobs list

To find out more about the Chainlink CLI, you can always run chainlink help.

Check out the doc pages on Jobs to learn more about how to create Jobs.

Configuration

Node configuration is managed by a combination of environment variables and direct setting via API/UI/CLI.

Check the official documentation for more information on how to configure your node.

External Adapters

External adapters are what make Chainlink easily extensible, providing simple integration of custom computations and specialized APIs. A Chainlink node communicates with external adapters via a simple REST API.

For more information on creating and using external adapters, please see our external adapters page.

Development

Running tests

Install Yarn

Install gencodec and jq to be able to run go generate ./... and make abigen

Install mockery

make mockery

Using the make command will install the correct version.

1. Build contracts:

yarn
yarn setup:contracts

2.   Generate and compile static assets:

go generate ./...

3.   Prepare your development environment:

export DATABASE_URL=postgresql://127.0.0.1:5432/chainlink_test?sslmode=disable

Note: Other environment variables should not be set for all tests to pass

4.   Drop/Create test database and run migrations:

go run ./core/main.go local db preparetest

If you do end up modifying the migrations for the database, you will need to rerun

5.   Run tests:

go test ./...

Notes

• The parallel flag can be used to limit CPU usage, for running tests in the background (-parallel=4) - the default is GOMAXPROCS
• The p flag can be used to limit the number of packages tested concurrently, if they are interferring with one another (-p=1)
• The -short flag skips tests which depend on the database, for quickly spot checking simpler tests in around one minute

Race Detector

As of Go 1.1, the runtime includes a data race detector, enabled with the -race flag. This is used in CI via the tools/bin/go_core_race_tests script. If the action detects a race, the artifact on the summary page will include race.* files with detailed stack traces.

It will not issue false positives, so take its warnings seriously.

For local, targeted race detection, you can run:

GORACE="log_path=$PWD/race" go test -race ./core/path/to/pkg -count 10
GORACE="log_path=$PWD/race" go test -race ./core/path/to/pkg -count 100 -run TestFooBar/sub_test 

https://go.dev/doc/articles/race_detector

Fuzz tests

As of Go 1.18, fuzz tests func FuzzXXX(*testing.F) are included as part of the normal test suite, so existing cases are executed with go test.

Additionally, you can run active fuzzing to search for new cases:

go test ./pkg/path -run=XXX -fuzz=FuzzTestName

https://go.dev/doc/fuzz/

Solidity

Inside the contracts/ directory:

1. Install dependencies:

yarn

2.  Run tests:

yarn test

Code Generation

Go generate is used to generate mocks in this project. Mocks are generated with mockery and live in core/internal/mocks.

Nix Flake

A flake is provided for use with the Nix package manager. It defines a declarative, reproducible development environment.

To use it:

1. Nix has to be installed with flake support.
2. Run nix develop. You will be put in shell containing all the dependencies. Alternatively, a direnv integration exists to automatically change the environment when cd-ing into the folder.
3. Create a local postgres database:

cd $PGDATA/
initdb
pg_ctl -l $PGDATA/postgres.log -o "--unix_socket_directories='$PWD'" start
createdb chainlink_test -h localhost
createuser --superuser --no-password chainlink -h localhost

4.   Start postgres, pg_ctl -l $PGDATA/postgres.log -o "--unix_socket_directories='$PWD'" start

Now you can run tests or compile code as usual.

Tips

For more tips on how to build and test Chainlink, see our development tips page.

Contributing

Chainlink's source code is licensed under the MIT License, and contributions are welcome.

Please check out our contributing guidelines for more details.

Thank you!

Download details:

Author: smartcontractkit
Source code: https://github.com/smartcontractkit/chainlink
License: MIT license

#smartcontract #blockchain #oracle #chainlink #golang #solidity

What is GEEK

Buddha Community

Oracle Kills 402 Bugs in Massive October Patch Update

Business software giant Oracle is urging customers to update their systems in the October release of its quarterly Critical Patch Update (CPU), which fixes 402 vulnerabilities across various product families.

Well over half (272) of these vulnerabilities open products up to remote exploitation without authentication. That means that the flaw may be exploited over a network without requiring user credentials.

The majority of the flaws are in Oracle Financial Services Applications (53), Oracle MySQL (53), Oracle Communications (52), Oracle Fusion Middleware (46), Oracle Retail Applications (28) and Oracle E-Business Suite (27). But overall, 27 Oracle product families are affected by the flaws. Users can find a patch availability document for each product, available here.

“Oracle continues to periodically receive reports of attempts to maliciously exploit vulnerabilities for which Oracle has already released security patches,” according to the company’s release on Tuesday. “In some instances, it has been reported that attackers have been successful because targeted customers had failed to apply available Oracle patches. Oracle therefore strongly recommends that customers remain on actively-supported versions and apply Critical Patch Update security patches without delay.”

While details of the flaws themselves are scant, two of the critical vulnerabilities disclosed by Oracle rank the highest severity score – 10 out of 10 – on the CVSS scale.

These include a flaw in the self-service analytics component of Oracle Healthcare Foundation, which is a unified healthcare-analytics platform that is part of the Oracle Health Science Applications suite. The flaw (CVE-2020-1953), which can be remotely exploited without requiring any user credentials, requires no user interaction and is easy to exploit, according to Oracle. Affected supported versions include 7.1.1, 7.2.0, 7.2.1 and 7.3.0.

The second severe flaw (CVE-2020-14871) exists in the pluggable authentication module of Oracle Solaris, its enterprise operating system for Oracle Database and Java applications (part of the Oracle Systems risk matrix). The flaw is also remotely exploitable without user credentials, requires no user interaction and is a “low-complexity” attack. Versions 10 and 11 are affected.

Sixty-five of the vulnerabilities also had a CVSS base score of 9.8 (and six had a score of 9.4) out of 10, making them critical in severity.

Oracle did offer some workarounds, advising that for attacks that require certain privileges or access to certain packages, removing the privileges or the ability to access the packages from users that do not need the privileges may help reduce the risk of successful attack. Users can also reduce the risk of successful attack by blocking network protocols required by an attack.

However, both these approaches may break application functionality, and Oracle does not recommend that either approach be considered a long-term solution as neither corrects the underlying problem.

“Due to the threat posed by a successful attack, Oracle strongly recommends that customers apply Critical Patch Update security patches as soon as possible,” according to the company.

Oracle releases its CPUs on the Tuesday closest to the 17th day of January, April, July and October.

Previous quarterly updates have stomped out hundreds of bugs across the company’s product lines, including one in April that patched 405. There are also out-of-band updates; in June for instance, Oracle warned of a critical remote code-execution flaw in its WebLogic Server being actively exploited in the wild.

#vulnerabilities #web security #cpu #critical patch update #cve-2020-14871 #cve-2020-1953 #oracle #oracle communications #oracle e-business suite #oracle financial services applications #oracle fusion middleware #oracle mysql #oracle retail applications #quarterly patch update #remote code execution #security update

Chainlink: Node Of The Decentralized Oracle Network & Off-chain

Chainlink 

Chainlink expands the capabilities of smart contracts by enabling access to real-world data and off-chain computation while maintaining the security and reliability guarantees inherent to blockchain technology.

This repo contains the Chainlink core node, operator UI and contracts. The core node is the bundled binary available to be run by node operators participating in a decentralized oracle network. All major release versions have pre-built docker images available for download from the Chainlink dockerhub. If you are interested in contributing please see our contribution guidelines. If you are here to report a bug or request a feature, please check currently open Issues. For more information about how to get started with Chainlink, check our official documentation. Resources for Solidity developers can be found in the Chainlink Hardhat Box.

Community

Chainlink has an active and ever growing community. Discord is the primary communication channel used for day to day communication, answering development questions, and aggregating Chainlink related content. Take a look at the community docs for more information regarding Chainlink social accounts, news, and networking.

Build Chainlink

1. Install Go 1.18, and add your GOPATH's bin directory to your PATH
   • Example Path for macOS export PATH=$GOPATH/bin:$PATH & export GOPATH=/Users/$USER/go
2. Install NodeJS & Yarn. See the current version in package.json at the root of this repo under the engines.node key.
   • It might be easier long term to use nvm to switch between node versions for different projects. For example, assuming $NODE_VERSION was set to a valid version of NodeJS, you could run: nvm install $NODE_VERSION && nvm use $NODE_VERSION
3. Install Postgres (>= 11.x).
   • You should configure Postgres to use SSL connection (or for testing you can set ?sslmode=disable in your Postgres query string).
4. Ensure you have Python 3 installed (this is required by solc-select which is needed to compile solidity contracts)
5. Download Chainlink: git clone https://github.com/smartcontractkit/chainlink && cd chainlink
6. Build and install Chainlink: make install
   • If you got any errors regarding locked yarn package, try running yarn install before this step
   • If yarn install throws a network connection error, try increasing the network timeout by running yarn install --network-timeout 150000 before this step
7. Run the node: chainlink help

For the latest information on setting up a development environment, see the Development Setup Guide.

Mac M1/ARM64 [EXPERIMENTAL]

Chainlink can be experimentally compiled with ARM64 as the target arch. You may run into errors with cosmwasm:

# github.com/CosmWasm/wasmvm/api
ld: warning: ignoring file ../../../.asdf/installs/golang/1.18/packages/pkg/mod/github.com/!cosm!wasm/wasmvm@v0.16.3/api/libwasmvm.dylib, building for macOS-arm64 but attempting to link with file built for macOS-x86_64
Undefined symbols for architecture arm64:# github.com/CosmWasm/wasmvm/api
ld: warning: ignoring file ../../../.asdf/installs/golang/1.18/packages/pkg/mod/github.com/!cosm!wasm/wasmvm@v0.16.3/api/libwasmvm.dylib, building for macOS-arm64 but attempting to link with file built for macOS-x86_64
Undefined symbols for architecture arm64:

In this case, try the following steps:

1. git clone git@github.com:mandrean/terra-core.git
2. cd terra-core; git checkout feat/multiarch
3. make install; cd ..
4. go work init /path/to/chainlink
5. go work use /path/to/terra-core

Ethereum Node Requirements

In order to run the Chainlink node you must have access to a running Ethereum node with an open websocket connection. Any Ethereum based network will work once you've configured the chain ID. Ethereum node versions currently tested and supported:

[Officially supported]

• Parity/Openethereum
• Geth
• Nethermind

[Unofficially supported]

• Besu
• Erigon

We cannot recommend specific version numbers for ethereum nodes since the software is being continually updated, but you should usually try to run the latest version available.

Running a local Chainlink node

NOTE: By default, chainlink will run in TLS mode. For local development you can disable this by setting the following env vars:

CHAINLINK_DEV=true
CHAINLINK_TLS_PORT=0
SECURE_COOKIES=false

Alternatively, you can generate self signed certificates using tools/bin/self-signed-certs or manually.

To start your Chainlink node, simply run:

chainlink node start

By default this will start on port 6688. You should be able to access the UI at http://localhost:6688/.

Chainlink provides a remote CLI client as well as a UI. Once your node has started, you can open a new terminal window to use the CLI. You will need to log in to authorize the client first:

chainlink admin login

(You can also set ADMIN_CREDENTIALS_FILE=/path/to/credentials/file in future if you like, to avoid having to login again).

Now you can view your current jobs with:

chainlink jobs list

To find out more about the Chainlink CLI, you can always run chainlink help.

Check out the doc pages on Jobs to learn more about how to create Jobs.

Configuration

Node configuration is managed by a combination of environment variables and direct setting via API/UI/CLI.

Check the official documentation for more information on how to configure your node.

External Adapters

External adapters are what make Chainlink easily extensible, providing simple integration of custom computations and specialized APIs. A Chainlink node communicates with external adapters via a simple REST API.

For more information on creating and using external adapters, please see our external adapters page.

Development

Running tests

Install Yarn

Install gencodec and jq to be able to run go generate ./... and make abigen

Install mockery

make mockery

Using the make command will install the correct version.

1. Build contracts:

yarn
yarn setup:contracts

2.   Generate and compile static assets:

go generate ./...

3.   Prepare your development environment:

export DATABASE_URL=postgresql://127.0.0.1:5432/chainlink_test?sslmode=disable

Note: Other environment variables should not be set for all tests to pass

4.   Drop/Create test database and run migrations:

go run ./core/main.go local db preparetest

If you do end up modifying the migrations for the database, you will need to rerun

5.   Run tests:

go test ./...

Notes

• The parallel flag can be used to limit CPU usage, for running tests in the background (-parallel=4) - the default is GOMAXPROCS
• The p flag can be used to limit the number of packages tested concurrently, if they are interferring with one another (-p=1)
• The -short flag skips tests which depend on the database, for quickly spot checking simpler tests in around one minute

Race Detector

As of Go 1.1, the runtime includes a data race detector, enabled with the -race flag. This is used in CI via the tools/bin/go_core_race_tests script. If the action detects a race, the artifact on the summary page will include race.* files with detailed stack traces.

It will not issue false positives, so take its warnings seriously.

For local, targeted race detection, you can run:

GORACE="log_path=$PWD/race" go test -race ./core/path/to/pkg -count 10
GORACE="log_path=$PWD/race" go test -race ./core/path/to/pkg -count 100 -run TestFooBar/sub_test 

https://go.dev/doc/articles/race_detector

Fuzz tests

As of Go 1.18, fuzz tests func FuzzXXX(*testing.F) are included as part of the normal test suite, so existing cases are executed with go test.

Additionally, you can run active fuzzing to search for new cases:

go test ./pkg/path -run=XXX -fuzz=FuzzTestName

https://go.dev/doc/fuzz/

Solidity

Inside the contracts/ directory:

1. Install dependencies:

yarn

2.  Run tests:

yarn test

Code Generation

Go generate is used to generate mocks in this project. Mocks are generated with mockery and live in core/internal/mocks.

Nix Flake

A flake is provided for use with the Nix package manager. It defines a declarative, reproducible development environment.

To use it:

1. Nix has to be installed with flake support.
2. Run nix develop. You will be put in shell containing all the dependencies. Alternatively, a direnv integration exists to automatically change the environment when cd-ing into the folder.
3. Create a local postgres database:

cd $PGDATA/
initdb
pg_ctl -l $PGDATA/postgres.log -o "--unix_socket_directories='$PWD'" start
createdb chainlink_test -h localhost
createuser --superuser --no-password chainlink -h localhost

4.   Start postgres, pg_ctl -l $PGDATA/postgres.log -o "--unix_socket_directories='$PWD'" start

Now you can run tests or compile code as usual.

Tips

For more tips on how to build and test Chainlink, see our development tips page.

Contributing

Chainlink's source code is licensed under the MIT License, and contributions are welcome.

Please check out our contributing guidelines for more details.

Thank you!

Download details:

Author: smartcontractkit
Source code: https://github.com/smartcontractkit/chainlink
License: MIT license

#smartcontract #blockchain #oracle #chainlink #golang #solidity

5 Steps To Get An Oracle Database Certification

So, do you have to become Oracle Certified? it has been a debatable issue for a short time, but one thing is certain: the Oracle Certification provides an accurate measure of your technical abilities.

Additionally, it gives you a foothold over people competing for the database administration positions you desire. Join Oracle online certification course and get complete guidance

Here are the steps to getting an Oracle Database certification:

1. Associate Certification

The first step to getting your Oracle is getting the Associate Certification, which needs that the person passes two tests to become an Oracle Certified Associate (OCA). With this qualification, you’ll add junior management as a team member or an application developer. to urge the associate certification, you’ve got to pass in one among the three tests explained below and therefore the final “Oracle Database 11g: Administration I” test.Join best Oracle online training program to improve your skills.

Step 1: Take one among the subsequent three courses

Oracle Database 12c: SQL Fundamentals 1Z0-061

The examination tests ability to make, retrieve, maintain, and edit data during a database. Mainly, this involves a grasp of important database administration concepts like an electronic database. Additionally, the necessity to know and use SQL is extremely important, because the test would require you to demonstrate your SQL programming skills.

Oracle Database SQL Expert 1Z0-047

In general, this is often a complicated version of the “Introduction to Oracle9i SQL” test. you’ll need proficiency in 76 topics to achieve this exam. you would like to possess a high understanding of database objects, control privileges, and system-level queries. The questions require a deep understanding of SQL, and are multiple parts in nature, requiring the application of concepts instead of mere memorization of answers. Experience in database administration will offer you a notable advantage during this test.

Oracle Database 11g: SQL Fundamentals I 1Z0-051

This test is an improved version of the “Introduction to Oracle9i SQL” test. The content is newer and includes set and conditional operators, which are absent within the older version. Therefore, you’d be happier choosing this test over the previous.

Step 2: Oracle Database 11g: Administration I 1Z0-052

The test requires knowledge on the way to found out database environments and secure Oracle instances in any network environment. Other concepts needed to pass this exam include understanding of database backup and recovery, Oracle Database Architecture, also as the configuration of security instances. The questions require the application of concepts, not just memorization of data.

2. Professional Certification

The professional certification allows you to manage large databases and develop large-scale database applications. In summary, to become an Oracle Certified Professional (OCP), you’ve got to require an instructor-led course, an exam, and a hands-on course.

Step 1: Be an Oracle Certified Associate

You must have the OCA certification as a pre-requisite for this course.

Step 2: Take an Exam

The second step within the OCP certification process is to require a course from a variety of about 50 courses and sit an exam. The list of those courses is out there on the Oracle site. The broad selection means you’ll choose the course that most accurately fits your training requirements. Note that you simply cannot meet the wants of this course through self-study; you’ve got to require an instructor-led class, a virtual class, or learn through training-on-demand.

Step 3: Submission of an Already Completed Course

In this step, you’re required to submit a previously completed course from an inventory of 21 courses. Alternatively, Oracle allows submissions from courses taken within the previous step.

Step 4: Oracle Database 11g: Administration II 1Z0-053

This is the ultimate exam within the OCP certification process. Once you pass this exam, you’ll proceed to the ultimate process.

Step 5: Submit a course completion form
Once you pass this exam, you only need to complete a course submission because of the final step within the OCP certification process.

Master Certification

This is the very best Oracle certification you’ll get. With this qualification, you’ll well-suited to figure in senior levels in IT departments handling sensitive database system issues and applications. you’ll need an OCP certification to urge started. then you’ll take a two-day exam then a hands-on course.

Conclusion:
In general, Oracle Certified database administrators have the knowhow to run databases both at the junior and senior levels, counting on the certification level. Some people might argue that there’s little point to being certified because the process involves the memorization of theoretical concepts and taking a multiple-choice test. However, while there’s credence to the very fact that certification does little to catch up on the shortage of technical competence obtained through experience, it does give validity to such claims. As an Oracle Certified database services, potential employers and clients are more easily convinced of your capabilities within the field.

#oracle online training #oracle online course #oracle online certification course #oracle certification course #oracle course #oracle training

Hire Dedicated Node.js Developers - Hire Node.js Developers

If you look at the backend technology used by today’s most popular apps there is one thing you would find common among them and that is the use of NodeJS Framework. Yes, the NodeJS framework is that effective and successful.

If you wish to have a strong backend for efficient app performance then have NodeJS at the backend.

WebClues Infotech offers different levels of experienced and expert professionals for your app development needs. So hire a dedicated NodeJS developer from WebClues Infotech with your experience requirement and expertise.

So what are you waiting for? Get your app developed with strong performance parameters from WebClues Infotech

For inquiry click here: https://www.webcluesinfotech.com/hire-nodejs-developer/

Book Free Interview: https://bit.ly/3dDShFg

#hire dedicated node.js developers #hire node.js developers #hire top dedicated node.js developers #hire node.js developers in usa & india #hire node js development company #hire the best node.js developers & programmers

Top 5 New Features of Oracle 18c Database

Any of the developments are fairly minor and incremental. For example, in previous versions of App Express, the end date within a range was removed from the list. In version 5.1, it is including with Oracle 18c, the range end date is included as it is with all other elements of Application Express. Now, version 5.1 also enables end-users to access their scheduling with the arrow keys on the keyboard, an update to the interface that is tiny but usefully intuitive.
In the updated Oracle, other improvements are more important and can have a greater impact on your everyday operations. These five impacts us as has been the most important.

Integration with Microsoft Active Directory
The database will authenticate and authorize users from Microsoft’s Active Directory, beginning with Oracle 18c, without any intermediate directories being needed.
This is a modern, easier way for Active Directory to integrate. Intermediary software such as Oracle Enterprise Public Participation was needed in previous versions to achieve integration.
This new function is called Centrally Managed Users (CMU) and allows you to manage Oracle application access authorization for Active Directory users. When clients are authenticated in this way, Active Directory account policies are implemented by the Oracle database.
Schema Only Accounts
In the past, as a user profile that held certain objects, a schema could be linked more closely. But this also meant that a user could log in and have control over all artifacts in the schema.
With schema accounts only, clients are still unable to login to the schema directly. These kinds of profiles can be developed without a password and, much like a normal user profile, allowances or tasks can be allocated.
Server Draining Ahead of Planned Maintenance
The database will now fail over the sessions to another service or node in a RAC area, Oracle 18c. For example, if a service is transferred to another node, the database labels existing drainage sessions so that the application is not disturbed. Any new sessions will be guided to another usable operating service.
The database uses a collection of rules to assess the end of a session and can be deleted from the server. These rules include custom SQL link checks and access limits where no request is active or operation is finished and the session has one or more recoverable states that can be reconstructed during failover.
Automatic In-Memory
As a manner to improve performance by maintaining columnar-compressed database segments in storage, Oracle In-Memory was implemented in version 12c. In 18c, Oracle promotes in-memory development by introducing Automatic In-memory (AIM). By creating a heat map of the in-memory enabled items, Target operates and creates opportunities for more commonly used applications objects. Only when there isn’t enough space to add another item to the memory store will Goal kick in.
SQL Cancel
In previous versions of Oracle, it was determined to destroy the session that was operating SQL if a database administrator tried to cancel a SQL query. This meant the session had to be removed from the database and a new connection had to be started. In Oracle 18c, the SQL statement itself can now be deleted and scaled back.
*If you want to learn Oracle DBA Training in Chennai and FITA Academy is one of the best Oracle DBA Training Institutes in Chennai. We are giving the placement assistance and also giving the advanced level of techniques of oracle DBA. We also giving Oracle Training in Coimbatore, Oracle Training in Chennai and Oracle Training in Bangalore. If you want to kick start your career with Oracle then this is the correct ace to learn about the Oracle database. *

#oracle dba training in chennai #oracle training #oracle training in chennai #oracle #oracle dba #training