A managed service called Amazon
Relational Database Service (Amazon RDS) makes it simple to set up, run, and
scale a relational database in the cloud. While managing time-consuming
database administration activities, it offers cost-effective and scalable capacity,
freeing you to concentrate on your applications and company.
You have access to the features of a well-known MySQL,
MariaDB, Oracle, SQL Server, or PostgreSQL database using Amazon RDS. This
indicates that Amazon RDS should function seamlessly with the code, apps, and
tools you now use with your existing databases. Your database can be
automatically backed up via Amazon RDS, and the most recent version of your
database software can always be used. You gain from the adaptability that comes
with being able to quickly scale the computing or storage resources connected
to your relational database instance. Additionally, for read-intensive database
workloads, Amazon RDS makes it simple to implement replication to increase
database availability, improve data durability, or extend beyond the
limitations of a single database instance. There are no upfront costs involved,
and you just pay for the resources you use, like with all Amazon Web Services.
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Ques. 1): What should I do if my queries appear to be taking
a while to execute?
Answer:
We recommend turning up Enhanced Monitoring for production
databases, which gives you access to more than 50 CPU, RAM, file system, and
disc I/O metrics. You can select the granularity and enable these
functionalities on an instance-by-instance basis (all the way down to 1
second). The performance of queries can be negatively impacted by high CPU
utilisation, so you might choose to scale your DB instance class in this
situation.
If your database uses RDS for MySQL or MariaDB, you can
examine the slow query logs to find out whether any SQL queries are performing
slowly and, if so, what their individual performance traits are. To review the
slow-moving SQL queries, you could set the "slow query log" DB
Parameter and query the mysql.slow log table. You can spot slow queries if
you're using RDS for Oracle by looking at the information in the Oracle trace
file. If you're using RDS for SQL Server, you can find slow queries using the
client side SQL Server traces.
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Ques. 2): How can you can examine the slow query logs to
find out whether any SQL queries are performing slowly?
Answer:
To review the slow-moving SQL queries, you could set the
"slow query log" DB Parameter and query the mysql.slow log table. You
can spot slow queries if you're using RDS for Oracle by looking at the
information in the Oracle trace file. If you're using RDS for SQL Server, you
can find slow queries using the client side SQL Server traces.
Using the AWS Management Console, Amazon RDS APIs, or AWS
Command Line Interface, creating DB instances is straightforward. Using the AWS
Management Console, click "RDS" and then the "Launch DB
Instance" button on the Instances tab to start a database instance. The
parameters for your database instance can then be specified, including the database
engine and version, licence model, instance type, storage type and quantity,
and principal user credentials.
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Ques. 3): When would I utilise Relational Database AMIs for
Amazon EC2 instead of Amazon RDS?
Answer:
For developers, Amazon Web Services offers a variety of database
substitutes. By offloading database administration, Amazon RDS enables you to
run a fully managed and feature-rich relational database. You may control your
own relational database in the cloud by utilising one of our many relational
database AMIs on Amazon EC2. These alternatives have significant differences
that could make one more suitable for your use case.
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Ques. 4): How do I load data into an instance of Amazon RDS
DB?
Answer:
You can import data into Amazon RDS in a number of
straightforward ways, including using the mysqldump or mysqlimport utilities
for MySQL; Data Pump, import/export, or SQL Loader for Oracle; the
Import/Export wizard, full backup files (.bak files), or Bulk Copy Program
(BCP) for SQL Server; or pg dump for PostgreSQL.
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Ques. 5): Can I test a new version of my database before
upgrading?
Answer:
Yes. To achieve this, you can take a database snapshot of
your current database instance, restore the database instance using the
database snapshot, then start a version upgrade for the newly created database
instance. Before determining whether or not to upgrade your original DB
instance, you can experiment securely on the upgraded duplicate of your DB
instance.
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Ques. 6): What benefits does the Amazon RDS AWS Free Tier
provide?
Answer:
The Bring-Your-Own-License (BYOL) licencing model for Oracle,
MySQL, MariaDB, PostgreSQL, and SQL Server Express Edition are supported under
the AWS Free Tier for Amazon RDS service. There is a monthly limit of 750
instance hours for the free use tier. Customers also get 20 GB of free backup
storage and 20 GB of general purpose (SSD) database storage each month.
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Ques. 7): What if I want to cover an existing database
instance with a reserved instance?
Answer:
Simply acquire a DB instance reservation in the same Region
as the DB instance you are presently running and want to reserve, with the same
DB instance class, DB engine, Multi-AZ option, and License Model. If the
reservation purchase is successful, Amazon RDS will immediately charge your
existing DB instance with the new hourly usage fee.
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Ques. 8): Are Multi-AZ deployments able to use reserved
instances?
Answer:
Yes. When purchasing a reserved instance, you can choose the
Multi-AZ option from the list of potential DB instance configurations.
Additionally, a Multi-AZ reserved instance will cover usage for two Single-AZ
DB instances if you are using a DB engine and licence model that enable
flexible reserved instance sizes.
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Ques. 9): Will my database instance be accessible after
scaling?
Answer:
You can increase the storage space allotted to your DB
Instance while still keeping it available. However, your database will be
briefly inaccessible when the DB instance class is changed if you want to scale
the compute resources that are available to your DB instance up or down. Unless
you specify that the adjustment should be done immediately, this brief period
of unavailability usually only lasts a few minutes and occurs during the
maintenance window for your DB Instance.
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Ques. 10): Does my DB Instance automatically do backups, or
do I need to turn them on?
Answer:
Your DB Instance can automatically be backed up with a 7-day
retention period via Amazon RDS by default. Only active DB Instances are
eligible for the free backup storage, which is capped at the size of your
supplied database. For instance, we will give you 100 GB-months of backup
storage for free if you have 100 GB of allocated database storage every month.
When creating a new DB Instance, you can use the console,
the CreateDBInstance API, or the ModifyDBInstance API to change the backup
retention duration (for existing instances). You can use these APIs to change
the RetentionPeriod parameter to any number from 0 (which will disable
automated backups) to the desired number of days. The value can't be set to 0
if the DB instance is a source to Read Replicas.
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Ques. 11): How does Amazon RDS function with Amazon Virtual
Private Cloud (VPC)?
Answer:
Establish a virtual networking environment with total
control over elements including private IP address ranges, subnets, routing
tables, and network gateways using Amazon VPC to create a private, isolated
area of the AWS cloud. By defining a virtual network topology and customising
the network configuration with Amazon VPC, you may make your virtual network
closely match an IP network that you might run in your own data centre.
When you want to preserve non-publicly accessible backend
servers on a private subnet while still running a public-facing web service,
VPC can be useful. You can create a public-facing subnet for your webservers
that has access to the Internet, and place your backend Amazon RDS DB Instances
in a private-facing subnet with no Internet access.
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Ques. 12): What security measures should I do to guarantee
that my application may access my DB Instances in VPC?
Answer:
To make sure that your DB instance can be reached from your
client instances in the VPC, it is your responsibility to adjust the routing
tables and networking ACLs in the VPC. Your client's EC2 instance and Amazon
RDS DB Instance may be in separate Availability Zones for Multi-AZ setups after
failover. You should set up your networking ACLs to permit communication across
AZs.
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Ques. 13): What is the difference between an AWS account and
an Amazon RDS primary user account?
Answer:
You must have a developer account with AWS in order to use
Amazon RDS. You will be asked to create one when you start the Amazon RDS
sign-up process if you don't already have one. A primary user account is
utilised exclusively in the context of Amazon RDS to manage access to your DB
Instance and is distinct from an AWS developer account (s). Your DB Instance
can be accessed via the principal user account, which is a native database user
account.
Each DB Instance can have a primary user name and password
specified when the DB Instance is created. Once you have created your DB
Instance, you can connect to the database using the primary user credentials.
Subsequently, you may also want to create additional user accounts so that you
can restrict who can access your DB Instance.
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Ques. 14): On my Amazon RDS databases, can I encrypt data in
transit?
Answer:
For all database engines supported by Amazon RDS, encryption
at rest is supported using keys managed by AWS Key Management Service (KMS). A
database instance running with Amazon RDS encryption encrypts all automated
backups, read replicas, snapshots, and data stored at rest in the underlying
storage. The handling of encryption and decryption is transparent.
By producing a DB snapshot, a copy of that snapshot, and a
KMS encryption key, you may also add encryption to a previously unencrypted DB
instance or DB cluster. After that, you can use the encrypted snapshot to
restore an encrypted database instance or database cluster. Amazon RDS for
Oracle and SQL Server support those engines' Transparent Data Encryption (TDE)
technologies.
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Ques. 15): How do I pick the appropriate setup settings for
my DB Instance(s)?
Answer:
By default, Amazon RDS selects the best configuration
settings for your DB Instance while taking the instance class and storage
capacity into consideration. The Amazon RDS APIs, the AWS Command Line
Interface, or the AWS Management Console can all be used to modify them,
though. Please be aware that altering configuration parameters from recommended
values can result in unanticipated consequences such as performance degradation
or system failures and should only be done by experienced users who are willing
to take these risks.
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Ques. 16): Will I be informed if there is an automated
failover?
Answer:
Yes, to let you know that an automatic failover took place,
Amazon RDS will broadcast a DB instance event. To retrieve details about events
pertaining to your DB instance, utilise the DescribeEvents API or the
"Events" component of the Amazon RDS Console. To receive notifications
when particular DB events happen, you may also use Amazon RDS Event
Notifications.
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Ques. 17): How does running a database instance as a read
replica work?
Answer:
For read-intensive database workloads, read replicas make it
simple to utilise supported engines' built-in replication functionality to
elastically expand out beyond the capacity restrictions of a single DB
instance.
With just a few clicks in the AWS Management Console using
the CreateDBInstanceReadReplica API, you may build a read replica. Database
updates on the source DB instance will be duplicated using a supported engine's
native, asynchronous replication once the read replica has been built. For a
specific source DB Instance, you can build multiple read replicas and divide
the read traffic from your application across them.
Read replicas are susceptible to the advantages and
disadvantages of the built-in replication of supported engines. The replication
lag might vary greatly, and in particular, updates are applied to your read
replica(s) after they happen on the source DB instance. Along with the improved
database write availability and data durability that Multi-AZ deployments
offer, read replicas can be used with Multi-AZ deployments to benefit from read
scaling.
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Ques. 18): How can I establish a connection to my read
replica?
Answer:
By retrieving the endpoint(s) for your read replica using
the DescribeDBInstance API or the AWS Management Console, you can connect to a
read replica in the same way that you would connect to a conventional DB
instance (s). Your application will decide how read traffic will be split
across your read replicas if you have more than one.
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Ques. 19): Can I utilise a read replica to increase write
availability in the database or to safeguard the data on my source DB instance
against failure scenarios?
Answer:
We advise running your DB instance as a Multi-AZ deployment
if you want to employ replication to boost database write availability and
safeguard recent database modifications against various failure scenarios.
Database writes occur on a read replica with Amazon RDS Read Replicas, which
leverage supported engines' native, asynchronous replication, after they have
already occurred on the source DB instance. This replication "lag"
might vary greatly.
In contrast, Multi-AZ installations use synchronous
replication, which allows all database writes to occur simultaneously on the
primary and standby. This safeguards your most recent database updates, which
need to be accessible on the standby in the event that a failover is necessary.
Replication is fully controlled with Multi-AZ setups as
well. In the event of an outage, Amazon RDS immediately initiates a failover to
the standby (or to a read replica, in the case of Amazon Aurora) and monitors
for DB instance failure conditions or Availability Zone failure.
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Ques. 20): Can I only perform database read operations on my
read replicas?
Answer:
Read traffic is intended to be served by read replicas.
Advanced users could, however, want to execute Data Definition Language (DDL)
SQL operations against a read replica in some use situations. Adding a database
index to a read replica that is used for business reporting without adding the
same index to the relevant source DB instance is one example.
You may set up Amazon RDS for MySQL to allow DDL SQL
statements against a read replica. Change the active DB parameter group for the
read replica by changing the "read only" parameter to "0"
if you want to enable operations other than reads for a specific read replica.
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