How to read a 20 GB file if you only have 10 GB of RAM?

To read a 20 GB file with only 10 GB of RAM, you need to use a partial data loading approach — read the file in chunks.

For example, in JavaScript for the frontend, you can use FileReader with the slice method to read the file in parts:

const CHUNK_SIZE = 1024 * 1024 * 10; // 10 MB
let offset = 0;

function readChunk(file) {
  const slice = file.slice(offset, offset + CHUNK_SIZE);
  const reader = new FileReader();
  reader.onload = function(e) {
    const chunkData = e.target.result;
    // Process chunk data
    offset += CHUNK_SIZE;
    if (offset < file.size) {
      readChunk(file);
    }
  };
  reader.readAsArrayBuffer(slice);
}

// call: readChunk(file);

This approach allows processing large files sequentially without exceeding memory limits.