đa ta bây

1️⃣ What is the primary advantage of using Golang memdb?

• A. Persistence on disk

• B. Eliminates disk access for faster response

• C. Automatic indexing in SQL

• D. Built-in transactions across servers

2️⃣ What is a key limitation of memdb?

• A. No transaction support

• B. Vulnerability to data loss on server crash

• C. Very slow for lookups

• D. Requires external database driver

3️⃣ Which use case is not ideal for memdb?

• A. Session store

• B. Realtime analytics

• C. High-traffic spike apps

• D. Long-term archival storage

4️⃣ In memdb schema, StringFieldIndex{Field: "Email"} implies:

• A. Sorting by email auto on disk

• B. Unique index on Email for lookups

• C. Non-unique index for range queries

• D. Email will be stored as binary

5️⃣ What does txn.LowerBound("person", "age", 25) return?

• A. Objects with age <= 25

• B. Objects with age ≥ 25, ordered by age

• C. First object with age exactly 25

• D. None

6️⃣ Why does memdb use First(table, "id", value)?

• A. To update existing records

• B. To fetch the first matching object by index

• C. To delete the first record

• D. To perform full table scan

7️⃣ How do you insert or update an object in memdb?

• A. txn.Update(...)

• B. txn.Insert(...)

• C. txn.Put(...)

• D. txn.Save(...)

8️⃣ Which statement about range scans is correct?

• A. They require sorting by name index

• B. LowerBound uses an index and iterates until break

• C. They only work on string indexes

• D. They delete items in the range

9️⃣ After calling txn.Commit(), what happens if transaction context was write mode?

• A. Changes are persisted to disk

• B. Changes become part of in-memory state

• C. Data is printed to stdout

• D. All pending reads are canceled

10️⃣ To prevent memoRy leaks, you should do what after txn = db.Txn(false)?

• A. Always call txn.Commit()

• B. Always call txn.Abort()

• C. Call txn.DeleteAll()

• D. No need to close anything