Common Commands in MongoDB

Check Size of Tables in a Database

To check the size of tables in a database, use the following command to access the desired database:

use database_name

• Replace the database_name with the actual name of the database you want to access, for example: use mdworkflow.

(() => {
  const getReadableSize = b => b === 0 ? '0.0 B' : 
    ((u=['B','kB','MB','GB','TB','PB'])[i=Math.floor(Math.log(b)/Math.log(1024))],
    `${(b/Math.pow(1024,i)).toFixed(1)} ${u[i]}`);

  const stats = db.getCollectionNames().map(n => {
    try {
      const s = db.getCollection(n).stats();
      return {
        ns: s.ns || `${db.getName()}.${n}`,
        count: s.count || 0,
        size: (s.storageSize || 0) + (s.totalIndexSize || 0)
      };
    } catch (e) { return null; }
  }).filter(s => s && s.size > 0).sort((a,b) => b.size - a.size);

  if (!stats.length) return print("No valid collection data");

  const [maxNs, maxCnt] = stats.reduce(([nl, cl], s) => [
    Math.max(nl, s.ns.length),
    Math.max(cl, s.count.toString().length)
  ], ['Collection'.length, 'Documents'.length]);

  const h = `Collection${' '.repeat(maxNs-10)} | Documents${' '.repeat(maxCnt-9)} | Total Size`;
  print(h + '\n' + '-'.repeat(h.length));
  stats.forEach(s => print(
    `${s.ns.padEnd(maxNs)} | ${s.count.toString().padEnd(maxCnt)} | ${getReadableSize(s.size)}`
  ));
})();

• After running the above command, it will display the size of tables in the current database.