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Freshers / Beginner level questions & answers

Ques 1. What is Redis Cache?

Redis is an open-source, advance key value data store and cache. It is also referred as a data structure server which keys not only contains strings, but also hashes, sets, lists, and sorted sets.

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Ques 2. What is the meaning of Redis?

Redis stands for REmote DIctionary Server.

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Ques 3. How is Redis different from other databases?

Redis is a NoSQL, Opensource, in-memory data-structure store. It follows the principle of key-value store.

It is extremely fast, persistent, portable and supports many languages such as C, C++, C#, Clojure, Common Lisp, D, Dart, Erlang, Go, Haskell, Haxe, Io, Java, JavaScript (Node.js), Julia, Lua, Objective-C, Perl, PHP, Pure Data, Python, R, Racket, Ruby, Rust, Scala, Smalltalk and Tcl.

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Ques 4. In which language Redis is written?

Redis is written in ANSI C and mostly used for cache solution and session management. It creates unique keys for store values.

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Ques 5. What is the usage of Redis?

Redis is a special key-value store database that can function as a NoSQL database or as a memory-cache store to improve performance when serving data that is stored in system memory.

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Ques 6. How to interect with Redis?

After the installation of the server you can run the Redis Client provided by redis installation or you can open the command prompt and use the following command:

redis-cli  

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Ques 7. Which are the most popular companies using Redis?

Twitter, Github, Stackoverflow etc. are the most popular companies using Redis.

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Ques 8. What are the main features of Redis?

Following are the main features of Redis:

  • Redis is very simple to install setup and manage.
  • Redis is very fast. It can execute 100000 queries per second.
  • Redis is fast because data is being persistent in memory as well as stored on the disk.
  • Redis is very fast because it loads the whole dataset in primary memory.
  • Redis operations working on different data types are atomic so these operations can be accomplished safely i.e. to set or increase a key, add or remove elements from a set or increase a counter.
  • It supports various types of data structure such as strings, hashes, sets, lists, sorted sets etc.
  • Redis supports a variety of languages i.e. C, C++, C#, Ruby, Python, Twisted Python, PHP, Erlang, Tcl, Perl, Lua, Java, Scala etc.
  • If your favorite language is not supported yet, you can write your own client library, as the Protocol is pretty simple.
  • Redis supports simple master to slave replication.
  • Redis is portable.

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Intermediate / 1 to 5 years experienced level questions & answers

Ques 9. Explain the Replication Features of Redis?

Replication is important in order to archive high level of availability in big data systems. The data needs to be replicated at n number of places. This follows the master-slave approach where the master copy is maintained by master-slave and replicated to n other nodes.

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Ques 10. What are the advantages of using Redis?

Following is a list of some important advantages of Redis:

  • Redis is very fast.
  • It supports a server-side locking.
  • It has a rich client side library.
  • It is a good counter.
  • It supports Atomic Operation.

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Ques 11. What are the disadvantages/limitations of using Redis?

Following are the disadvantages/ limitations of Redis:

  • It is single threaded.
  • It has got limited client support for consistent hashing.
  • It has significant overhead for persistence.
  • It is not deployed widely.

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Ques 12. What is the difference between Redis and RDBMS?

There are a lot of differences between Redis and RDBMS:

  • Redis is a NoSQL database while RDBMS is an SQL database.
  • Redis follows the key-value structure while RDBMS follows the table structure.
  • Redis extremely fast while RDBMS is comparatively slow.
  • Redis stores all the dataset in primary memory while RDBMS stores its dataset in secondary memory.
  • Redis is generally used to store small and frequently used files while RDBMS is used to store big files.
  • Redis provides only official support for Linux, BSD, Mac OS X, Solaris. It doesn?t provide official support for Windows currently while RDBMS provides support for both.

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Experienced / Expert level questions & answers

Ques 13. Differentiate Memcached and Redis?

MemcachedRedis
Memcached only does caching information.It provides some more functionalities like replication and persistence along with caching information.
Memcached supports the functionality of LRU (Least Recently Used) eviction of values.LRU is not supported by Redis.
In Memcached, when they overflow memory, the one you have not used recently (LRU- Least Recently Used) will get deleted.In Redis, there is a time set for each function, Three keys are maintained, the one, which is closest to expiry, will get deleted.
CAS (Check and Set) is supported by Memcached.CAS is not supported by Redis.
Array objects are needed to be serialized in order to get saved. We need to unserialize them for their retrieval.Redis has got stronger data structures; it can handle strings, binary safe strings, list of binary safe strings, sorted lists, etc.
Memcached has at most 250 bytes length.Redis has at most 2 GB key length.
It is Multi-threadedIt is single threaded.

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Ques 14. Mention Operation Keys of Redis.

  • TYPE key
  • TTL key
  • EXPIRE key seconds
  • EXPIREAT key timestamp
  • EXISTS key
  • DEL key

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Ques 15. Which are the different data types used in Redis?

There are mainly 5 types of data types supported by Redis:

  • Strings
  • Hashes
  • Lists
  • Sets
  • Sorted Sets

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Ques 16. Which are the most popular commands of the Redis database?

CommandDescription
APPEND key valueAppend a value to a key
AUTH passwordAuthenticate to the server
BGREWRITEAOFAsynchronously rewrite the append-only file
BGSAVEAsynchronously save the dataset to disk
BITCOUNT key [start end]Count set bits in a string
BITFIELD key [GET type offset] [SET type offset value] [INCRBY type offset increment] [OVERFLOW WRAP|SAT|FAIL]Perform arbitrary bitfield integer operations on strings
BITOP operation destkey key [key ...]Perform bitwise operations between strings
BITPOS key bit [start] [end]Find first bit set or clear in a string
BLPOP key [key ...] timeoutRemove and get the first element in a list, or block until one is available
BRPOP key [key ...] timeoutRemove and get the last element in a list, or block until one is available
BRPOPLPUSH source destination timeoutPop a value from a list, push it to another list and return it; or block until one is available
CLIENT KILL [ip:port] [ID client-id] [TYPE normal|master|slave|pubsub] [ADDR ip:port] [SKIPME yes/no]Kill the connection of a client
CLIENT LISTGet the list of client connections
CLIENT GETNAMEGet the current connection name
CLIENT PAUSE timeoutStop processing commands from clients for some time
CLIENT REPLY ON|OFF|SKIPInstruct the server whether to reply to commands
CLIENT SETNAME connection-nameSet the current connection name
CLUSTER ADDSLOTS slot [slot ...]Assign new hash slots to receiving node
CLUSTER COUNT-FAILURE-REPORTS node-idReturn the number of failure reports active for a given node
CLUSTER COUNTKEYSINSLOT slotReturn the number of local keys in the specified hash slot
CLUSTER DELSLOTS slot [slot ...]Set hash slots as unbound in receiving node
CLUSTER FAILOVER [FORCE|TAKEOVER]Forces a slave to perform a manual failover of its master.
CLUSTER FORGET node-idRemove a node from the nodes table
CLUSTER GETKEYSINSLOT slot countReturn local key names in the specified hash slot
CLUSTER INFOProvides info about Redis Cluster node state
CLUSTER KEYSLOT keyReturns the hash slot of the specified key
CLUSTER MEET ip portForce a node cluster to handshake with another node
CLUSTER NODESGet Cluster config for the node
CLUSTER REPLICATE node-idReconfigure a node as a slave of the specified master node
CLUSTER RESET [HARD|SOFT]Reset a Redis Cluster node
CLUSTER SAVECONFIGForces the node to save cluster state on disk
CLUSTER SET-CONFIG-EPOCH config-epochSet the configuration epoch in a new node
CLUSTER SETSLOT slot IMPORTING|MIGRATING|STABLE|NODE [node-id]Bind a hash slot to a specific node
CLUSTER SLAVES node-idList slave nodes of the specified master node
CLUSTER SLOTSGet array of Cluster slot to node mappings
COMMANDGet array of Redis command details
COMMAND COUNTGet total number of Redis commands
COMMAND GETKEYSExtract keys given a full Redis command
COMMAND INFO command-name [command-name ...]Get array of specific Redis command details
CONFIG GET parameterGet the value of a configuration parameter
CONFIG REWRITERewrite the configuration file with the in memory configuration
CONFIG SET parameter valueSet a configuration parameter to the given value
CONFIG RESETSTATReset the stats returned by INFO
DBSIZEReturn the number of keys in the selected database
DEBUG OBJECT keyGet debugging information about a key
DEBUG SEGFAULTMake the server crash
DECR keyDecrement the integer value of a key by one
DECRBY key decrementDecrement the integer value of a key by the given number
DEL key [key ...]Delete a key
DISCARDDiscard all commands issued after MULTI
DUMP keyReturn a serialized version of the value stored at the specified key.
ECHO messageEcho the given string
EVAL script numkeys key [key ...] arg [arg ...]Execute a Lua script server side
EVALSHA sha1 numkeys key [key ...] arg [arg ...]Execute a Lua script server side
EXECExecute all commands issued after MULTI
EXISTS key [key ...]Determine if a key exists
EXPIRE key secondsSet a key\\\'s time to live in seconds
EXPIREAT key timestampSet the expiration for a key as a UNIX timestamp
FLUSHALL [ASYNC]Remove all keys from all databases
FLUSHDB [ASYNC]Remove all keys from the current database
GEOADD key longitude latitude member [longitude latitude member ...]Add one or more geospatial items in the geospatial index represented using a sorted set
GEOHASH key member [member ...]Returns members of a geospatial index as standard geohash strings
GEOPOS key member [member ...]Returns longitude and latitude of members of a geospatial index
GEODIST key member1 member2 [unit]Returns the distance between two members of a geospatial index
GEORADIUS key longitude latitude radius m|km|ft|mi [WITHCOORD] [WITHDIST] [WITHHASH] [COUNT count] [ASC|DESC] [STORE key] [STOREDIST key]Query a sorted set representing a geospatial index to fetch members matching a given maximum distance from a point
GEORADIUSBYMEMBER key member radius m|km|ft|mi [WITHCOORD] [WITHDIST] [WITHHASH] [COUNT count] [ASC|DESC] [STORE key] [STOREDIST key]Query a sorted set representing a geospatial index to fetch members matching a given maximum distance from a member
GET keyGet the value of a key
GETBIT key offsetReturns the bit value at offset in the string value stored at key
GETRANGE key start endGet a substring of the string stored at a key
GETSET key valueSet the string value of a key and return its old value
HDEL key field [field ...]Delete one or more hash fields
HEXISTS key fieldDetermine if a hash field exists
HGET key fieldGet the value of a hash field
HGETALL keyGet all the fields and values in a hash
HINCRBY key field incrementIncrement the integer value of a hash field by the given number
HINCRBYFLOAT key field incrementIncrement the float value of a hash field by the given amount
HKEYS keyGet all the fields in a hash
HLEN keyGet the number of fields in a hash
HMGET key field [field ...]Get the values of all the given hash fields
HMSET key field value [field value ...]Set multiple hash fields to multiple values
HSET key field valueSet the string value of a hash field
HSETNX key field valueSet the value of a hash field, only if the field does not exist
HSTRLEN key fieldGet the length of the value of a hash field
HVALS keyGet all the values in a hash
INCR keyIncrement the integer value of a key by one
INCRBY key incrementIncrement the integer value of a key by the given amount
INCRBYFLOAT key incrementIncrement the float value of a key by the given amount
INFO [section]Get information and statistics about the server
KEYS patternFind all keys matching the given pattern
LASTSAVEGet the UNIX time stamp of the last successful save to disk
LINDEX key indexGet an element from a list by its index
LINSERT key BEFORE|AFTER pivot valueInsert an element before or after another element in a list
LLEN keyGet the length of a list
LPOP keyRemove and get the first element in a list
LPUSH key value [value ...]Prepend one or multiple values to a list
LPUSHX key valuePrepend a value to a list, only if the list exists
LRANGE key start stopGet a range of elements from a list
LREM key count valueRemove elements from a list
LSET key index valueSet the value of an element in a list by its index
LTRIM key start stopTrim a list to the specified range
MGET key [key ...]Get the values of all the given keys
MIGRATE host port key|\\\"\\\" destination-db timeout [COPY] [REPLACE] [KEYS key [key ...]]Atomically transfer a key from a Redis instance to another one.
MONITORListen for all requests received by the server in real time
MOVE key dbMove a key to another database
MSET key value [key value ...]Set multiple keys to multiple values
MSETNX key value [key value ...]Set multiple keys to multiple values, only if none of the keys exist
MULTIMark the start of a transaction block
OBJECT subcommand [arguments [arguments ...]]Inspect the internals of Redis objects
PERSIST keyRemove the expiration from a key
PEXPIRE key millisecondsSet a key\\\'s time to live in milliseconds
PEXPIREAT key milliseconds-timestampSet the expiration for a key as a UNIX timestamp specified in milliseconds
PFADD key element [element ...]Adds the specified elements to the specified HyperLogLog.
PFCOUNT key [key ...]Return the approximated cardinality of the set(s) observed by the HyperLogLog at key(s).
PFMERGE destkey sourcekey [sourcekey ...]Merge N different HyperLogLogs into a single one.
PING [message]Ping the server
PSETEX key milliseconds valueSet the value and expiration in milliseconds of a key
PSUBSCRIBE pattern [pattern ...]Listen for messages published to channels matching the given patterns
PUBSUB subcommand [argument [argument ...]]Inspect the state of the Pub/Sub subsystem
PTTL keyGet the time to live for a key in milliseconds
PUBLISH channel messagePost a message to a channel
PUNSUBSCRIBE [pattern [pattern ...]]Stop listening for messages posted to channels matching the given patterns
QUITClose the connection
RANDOMKEYReturn a random key from the keyspace
READONLYEnables read queries for a connection to a cluster slave node
READWRITEDisables read queries for a connection to a cluster slave node
RENAME key newkeyRename a key
RENAMENX key newkeyRename a key, only if the new key does not exist
RESTORE key ttl serialized-value [REPLACE]Rename a key, only if the new key does not exist
RESTORE key ttl serialized-value [REPLACE]Create a key using the provided serialized value, previously obtained using DUMP.
ROLEReturn the role of the instance in the context of replication
RPOP keyRemove and get the last element in a list
RPOPLPUSH source destinationRemove the last element in a list, prepend it to another list and return it
RPUSH key value [value ...]Append one or multiple values to a list
RPUSHX key valueAppend a value to a list, only if the list exists
SADD key member [member ...]Add one or more members to a set
SAVESynchronously save the dataset to disk
SCARD keyGet the number of members in a set
SCRIPT DEBUG YES|SYNC|NOSet the debug mode for executed scripts.
SCRIPT EXISTS sha1 [sha1 ...]Check existence of scripts in the script cache.
SCRIPT FLUSHRemove all the scripts from the script cache.
SCRIPT KILLKill the script currently in execution.
SCRIPT LOAD scriptLoad the specified Lua script into the script cache.
SDIFF key [key ...]Subtract multiple sets
SDIFFSTORE destination key [key ...]Subtract multiple sets and store the resulting set in a key
SELECT indexChange the selected database for the current connection
SET key value [EX seconds] [PX milliseconds] [NX|XX]Set the string value of a key
SETBIT key offset valueSets or clears the bit at offset in the string value stored at key
SETEX key seconds valueSet the value and expiration of a key
SETNX key valueSet the value of a key, only if the key does not exist
SETRANGE key offset valueOverwrite part of a string at key starting at the specified offset
SHUTDOWN [NOSAVE|SAVE]Synchronously save the dataset to disk and then shut down the server
SINTER key [key ...]Intersect multiple sets
SINTERSTORE destination key [key ...]Intersect multiple sets and store the resulting set in a key
SISMEMBER key memberDetermine if a given value is a member of a set
SLAVEOF host portMake the server a slave of another instance, or promote it as master
SLOWLOG subcommand [argument]Manages the Redis slow queries log
SMEMBERS keyGet all the members in a set
SMOVE source destination memberMove a member from one set to another
SORT key [BY pattern] [LIMIT offset count] [GET pattern [GET pattern ...]] [ASC|DESC] [ALPHA] [STORE destination]Sort the elements in a list, set or sorted set
SPOP key [count]Remove and return one or multiple random members from a set
SRANDMEMBER key [count]Get one or multiple random members from a set
SREM key member [member ...]Remove one or more members from a set
STRLEN keyGet the length of the value stored in a key
SUBSCRIBE channel [channel ...]Listen for messages published to the given channels
SUNION key [key ...]Add multiple sets
SUNIONSTORE destination key [key ...]Add multiple sets and store the resulting set in a key
SWAPDB index indexSwaps two Redis databases
SYNCInternal command used for replication
TIMEReturn the current server time
TOUCH key [key ...]Alters the last access time of a key(s). Returns the number of existing keys specified.
TTL keyGet the time to live for a key
TYPE keyDetermine the type stored at key
UNSUBSCRIBE [channel [channel ...]]Stop listening for messages posted to the given channels
UNLINK key [key ...]Delete a key asynchronously in another thread. Otherwise it is just as DEL, but non blocking.
UNWATCHForget about all watched keys
WAIT numslaves timeoutWait for the synchronous replication of all the write commands sent in the context of the current connection
WATCH key [key ...]Watch the given keys to determine execution of the MULTI/EXEC block
ZADD key [NX|XX] [CH] [INCR] score member [score member ...]Add one or more members to a sorted set, or update its score if it already exists
ZCARD keyGet the number of members in a sorted set

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Ques 17. We all know that Reds is fast, but is it also durable?

In Redis, there is always a trade-of between durability and speed. In the case of system failure, it may lose data which is not stored.

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Ques 18. How can you enhance the durability of Redis?

  • Whenever a new command is added to the append log file, call Fsysnc() each time.
  • Keep calling Fsysnc() in every second. Despite of the 1 second data lose in the case of system fails.

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Ques 19. What are the concerned things while using Redis?

  • Consistent method selection in order to name and prefix the keys. Namespace management.
  • Make key prefixes registry which can map every documents to their owner applications.
  • Designing, implementing and testing the Garbage collection mechanism for each class we keep into the redis architecture.
  • Maintain a sharding library before investing so much into the application.

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Ques 20. How can you use Redis with .Net application?

To use Redis in .Net applications, follow these steps:

  • First, Download Redis Server.
  • Install Redis Server.
  • Download Redis Client.
  • Set Configuration into Web.config File.
  • Use Redis Client Class.

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Tableau interview questions and answers - Total 20 questions
Kubernetes interview questions and answers - Total 30 questions
Microservices interview questions and answers - Total 30 questions
Adobe AEM interview questions and answers - Total 50 questions
Fashion Designer interview questions and answers - Total 20 questions
Desktop Support interview questions and answers - Total 30 questions
IAS interview questions and answers - Total 56 questions
OOPs interview questions and answers - Total 30 questions
PHP OOPs interview questions and answers - Total 30 questions
Linked List interview questions and answers - Total 15 questions
SharePoint interview questions and answers - Total 28 questions
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Dynamic Programming interview questions and answers - Total 30 questions
CICS interview questions and answers - Total 30 questions
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Behavioral interview questions and answers - Total 29 questions
School Teachers interview questions and answers - Total 25 questions
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Apache Spark interview questions and answers - Total 24 questions
Full-Stack Developer interview questions and answers - Total 60 questions
Statistics interview questions and answers - Total 30 questions
System Design interview questions and answers - Total 30 questions
VISA interview questions and answers - Total 30 questions
IIS interview questions and answers - Total 30 questions
ANT interview questions and answers - Total 10 questions
SEO interview questions and answers - Total 51 questions
Cloud Computing interview questions and answers - Total 42 questions
BPO interview questions and answers - Total 48 questions
Google Analytics interview questions and answers - Total 30 questions
HR Questions interview questions and answers - Total 49 questions
REST API interview questions and answers - Total 52 questions
Control System interview questions and answers - Total 28 questions
Agile Methodology interview questions and answers - Total 30 questions
SAS interview questions and answers - Total 24 questions
Content Writer interview questions and answers - Total 30 questions
Hadoop interview questions and answers - Total 40 questions
Blockchain interview questions and answers - Total 29 questions
Mainframe interview questions and answers - Total 20 questions
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Technical Support interview questions and answers - Total 30 questions
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Nature interview questions and answers - Total 20 questions
Docker interview questions and answers - Total 30 questions
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Cryptography interview questions and answers - Total 40 questions
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RPA interview questions and answers - Total 26 questions
College Teachers interview questions and answers - Total 30 questions
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GIT interview questions and answers - Total 30 questions
Blue Prism interview questions and answers - Total 20 questions
JCL interview questions and answers - Total 20 questions
JavaScript interview questions and answers - Total 59 questions
Ajax interview questions and answers - Total 58 questions
Express.js interview questions and answers - Total 30 questions
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ES6 interview questions and answers - Total 30 questions
Electron.js interview questions and answers - Total 24 questions
RxJS interview questions and answers - Total 29 questions
NodeJS interview questions and answers - Total 30 questions
jQuery interview questions and answers - Total 22 questions
ExtJS interview questions and answers - Total 50 questions
Vue.js interview questions and answers - Total 30 questions
Svelte.js interview questions and answers - Total 30 questions
Shell Scripting interview questions and answers - Total 50 questions
Next.js interview questions and answers - Total 30 questions
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Knockout JS interview questions and answers - Total 25 questions
PowerShell interview questions and answers - Total 27 questions
Terraform interview questions and answers - Total 30 questions
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Cyber Security interview questions and answers - Total 50 questions
PII interview questions and answers - Total 30 questions
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BGP interview questions and answers - Total 30 questions
Tomcat interview questions and answers - Total 16 questions
Glassfish interview questions and answers - Total 8 questions
Ubuntu interview questions and answers - Total 30 questions
Linux interview questions and answers - Total 43 questions
Unix interview questions and answers - Total 105 questions
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QTP interview questions and answers - Total 44 questions
Cucumber interview questions and answers - Total 30 questions
TestNG interview questions and answers - Total 38 questions
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SDET interview questions and answers - Total 30 questions
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UiPath interview questions and answers - Total 38 questions
Mobile Testing interview questions and answers - Total 30 questions
API Testing interview questions and answers - Total 30 questions
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ETL Testing interview questions and answers - Total 20 questions
CSS interview questions and answers - Total 74 questions
Ruby On Rails interview questions and answers - Total 74 questions
Angular interview questions and answers - Total 50 questions
Yii interview questions and answers - Total 30 questions
PHP interview questions and answers - Total 27 questions
Oracle JET(OJET) interview questions and answers - Total 54 questions
Zend Framework interview questions and answers - Total 24 questions
Frontend Developer interview questions and answers - Total 30 questions
RichFaces interview questions and answers - Total 26 questions
HTML interview questions and answers - Total 27 questions
Flutter interview questions and answers - Total 25 questions
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React Native interview questions and answers - Total 26 questions
CakePHP interview questions and answers - Total 30 questions
Angular JS interview questions and answers - Total 21 questions
Angular 8 interview questions and answers - Total 32 questions
Web Developer interview questions and answers - Total 50 questions
Dojo interview questions and answers - Total 23 questions
GWT interview questions and answers - Total 27 questions
Symfony interview questions and answers - Total 30 questions
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