You are designing a schema for a database that needs to support real-time analytics. What factors would you consider to optimize the read performance of the database?
- Indexing relevant columns for faster retrieval.
- Implementing caching mechanisms to reduce database load.
- Using NoSQL databases for flexibility.
- Denormalizing data for quicker query performance.
When designing a schema for real-time analytics, indexing relevant columns is crucial as it speeds up data retrieval. Option (2) is also valid, as caching can significantly reduce database load. Option (3) might be a consideration but isn't the primary factor. Option (4) can be a trade-off, and it depends on the specific use case.
How can you access the properties of an object in JavaScript?
- object.property
- object.getProperty()
- object.getProperty
- getProperty(object)
To access the properties of an object in JavaScript, you use dot notation like object.property. This is the most common and straightforward way to access object properties. The other options are not standard ways to access object properties.
To optimize write-intensive workloads in a database, it's crucial to minimize the use of ________.
- Indexes
- Locks
- Transactions
- Constraints
To optimize write-intensive workloads in a database, it's crucial to minimize the use of "Locks." Locks can lead to contention and slow down write operations, especially in scenarios with high concurrent writes.
The Buffer.isBuffer(obj) method in Node.js is used to determine if an object is a ______.
- string
- buffer
- stream
- file
The Buffer.isBuffer method is used to determine if an object is a buffer in Node.js. It helps identify whether a given object is a Buffer instance or not.
To avoid blocking the Event Loop with CPU-bound tasks, developers can offload such tasks to ________.
- Worker Threads
- Callbacks
- Promises
- Timers
To avoid blocking the Event Loop with CPU-bound tasks, Node.js developers can offload such tasks to "Worker Threads." This allows for concurrent execution of tasks, ensuring that the Event Loop remains responsive for handling other I/O operations and events.
What will happen if you try to destructure properties not present in the object?
- The properties will be assigned undefined, and no error will be thrown.
- It will throw a "Property not found" error.
- The properties will be ignored, and no action will be taken.
- The code will fail to compile.
When destructuring properties not present in the object, they will be assigned undefined, and no error will be thrown. This is useful for handling optional properties or providing default values.
How can composite indexing be optimized to enhance query performance in relational databases?
- Use covering indexes
- Increase the number of indexed columns
- Avoid indexing on frequently updated columns
- Use B-tree indexes only
Composite indexing can be optimized by using covering indexes, which include all the columns required by a query. This reduces the need for additional table lookups and can significantly enhance query performance. Increasing the number of indexed columns may not always be beneficial as it can increase index maintenance overhead. Indexing frequently updated columns should be avoided to prevent write performance degradation. B-tree indexes are just one type of composite index, and the choice of index type depends on the specific use case.
What is the significance of the tilde (~) symbol in a version number, like ~1.2.3, in semantic versioning?
- It allows upgrades to the specified version and any future versions, including breaking changes.
- It signifies that downgrades are allowed.
- It restricts upgrades to only the specified version.
- It allows upgrades to the specified version and any future backward-compatible versions.
The tilde (~) symbol allows upgrades to the specified version and any future backward-compatible versions while keeping you within the same major version. It's more restrictive than the caret (^).
What does a 0 as the major version (e.g. 0.1.2) signify in semantic versioning?
- It indicates an unstable or experimental version with no guarantees of backward compatibility.
- It signifies the absence of a major version.
- It means that the software is in its initial release and is highly stable.
- It represents a pre-release version.
A 0 as the major version signifies an unstable or experimental version with no guarantees of backward compatibility. It's often used for initial development phases.
When utilizing closures, it is crucial to manage memory effectively to avoid ________.
- memory leaks
- buffer overflows
- infinite loops
- syntax errors
When utilizing closures, it is crucial to manage memory effectively to avoid memory leaks. If closures capture references to objects that are no longer needed, those objects will not be garbage collected, leading to memory leaks. Properly managing references and being mindful of what is captured in closures is essential to prevent this issue.