SIZE TIERED COMPACTION STRATEGY: The traditional suggested compaction technique is the Size Tiered Compaction Strategy (STCS), which is advised for workloads that involve a lot of writing. If no other compaction strategy is specified, this one is used by default. When Cassandra has amassed a… Read More
HOW TO CHOOSE SS TABLES TO COMPACT SSTables are separated by density leveling in levels determined by the fan factors of the compaction setup. The amount of SSTables on a level, however, cannot be used as a trigger because there may be non-overlapping SSTables, unlike… Read More
FUNCTIONS IN PYTHON FUNCTION: ▪️ A function is a block of code that performs a specific task. ▪️ Functions are defined by using the def keyword which follows by function name and parentheses which may have parameters. ▪️ Any function can accept zero or more… Read More
Exceptional Handling in python Exception handling allows developers to manage errors and unexpected situations. Exception handling is the process of managing errors and unexpected events that occur during the execution of a program. When a Python program encounters an error, it raises an exception, which… Read More
STRATEGIES OF COMPACTION ▪️ Unified Compaction Strategy (UCS) ▪️ Size-Tiered Compaction Strategy (STCS) ▪️ Leveled Compaction Strategy (LCS) ▪️ Time Window Compaction Strategy (TWCS) UNIFIED COMPACTION STRATEGY: For the majority of workloads, including mixed read-write, time-series, read-heavy, and write-heavy workloads, the UnifiedCompactionStrategy (UCS) is… Read More
CHANGE DATA CAPTURE When a configurable size-on-disk for the CDC log is reached, Change Data Capture (CDC) offers a technique to refuse writes to certain tables and flag them for archiving. By setting the table property cdc=true (either when creating the table or modifying it),… Read More
APACHE CASSANDRA INSTALLATIONS These are the guidelines for setting up the supported Apache Cassandra releases on Linux systems. Cassandra runs on a wide array of Linux distributions including (but not limited to): ⦁ Ubuntu, most notably LTS releases 16.04 to 18.04. ⦁ CentOS & RedHat… Read More
Built in Object Types in Python ▪️ All programming languages support a number of built-in variable types. These are the building blocks used for all the other variable types available within the language. ▪️ By combining or extending the basic variable, we can create some… Read More
BLOOM FILTERS WHAT ARE BLOOM FILTERS: Cassandra combines data from RAM (in memtables) and disk (in SSTables) in the read path. Cassandra uses a data structure called a bloom filter to avoid having to go through each and every SSTable data file to find the… Read More
Creating a new Docker Image/container from existing Container And run the new container. Step 1: Create an initial Base Container – for an App ▪️ Let’s get started by creating a running container. ▪️ So that we don’t get bogged down in the details of… Read More
CASSANDRA BACKUPS WHAT ARE BACKUPS: Immutable SSTable files are used by Apache Cassandra to store data. The backup copies of the database data that are kept as SSTable files in the Apache Cassandra database are called backups. There are various uses for backups, some of… Read More
OPERATORS IN PYTHON Operator: It is defined as a symbol which is responsible for a particular operation between two operands. Python supports different types of operators: 1. Arithmetic Operators 2. Assignment Operators 3. Logical Operators 4. Comparison Operators 5. Bitwise Operators 6. Identity Operators 7.… Read More
Creating Docker Container using Docker file: Use Case of Docker: ▪️ Consider a team working on a Java application. Various groups are involved in the Software Development lifecycle: designing, development, testing, production, deployment, etc. Step 1: The developer will create an environment that includes a Tomcat… Read More
Basics of Docker Containers: What are containers: ▪️ Containers are lightweight packages of your application code together with dependencies such as specific versions of programming language runtimes and libraries required to run your software services. ▪️ Containers make it easy to share CPU, memory, storage, and… Read More
String: ⦁ It is one of the built-in data structures in python. ⦁ String is a group of one or more characters which are enclosed in between single, double, triple quotes. ⦁ Strings can contain symbols, letters, numbers and special characters. ⦁ Strings are immutable… Read More
USER DEFINED DATA TYPES IN CQL Handling several fields of connected data in a table is made easier with the use of a user-defined type. By representing the linked fields of information using a user-defined type rather than storing them in separate tables, applications that… Read More
Handling SQL Error and Vulnerability BUG in JENKINS_job by SQLplus script runner plugin How to make Jenkins job as failure for SQL errors (SQL syntax or any SQL Error): Add the additional code in Jenkins SQL file or SQL user defined code. 👉To check the SQL failure.… Read More
Dictionary ▪️ Dictionary is the inbuilt data type in python which organizes data in a collection of key-value pairs, where each key is unique and maps to a specific value. ▪️ Each element in the dictionary is a key–value pair and one individual key value… Read More
DATATYPES IN CQL (2.0) CUSTOM DATA TYPE: A Custom datatype is defined by every Java class that extends the server-side Abstract Type class and can be loaded by Cassandra is called a custom type; as a result, it should be included in the CLASSPATH of every… Read More
Run SQL as JENKINS_PIPELINE_job by SQL plus script runner plugin. Running the SQL script – As Scripted pipeline job from Jenkins file in GIT repo Note: the SQL script placed in the same location as Jenkins file //Pipeline code (scripted pipe) in Jenkins file in GIT repo… Read More
