How transaction logs are implemented in ClickHouse?

In ClickHouse, transaction logs are implemented as a set of write-ahead logs (WALs) that are used to ensure durability and consistency of data in case of system failures or crashes. The WALs contain a sequential record of all changes made to the database, including inserts, updates, and deletes, in the order they were made. When […]

Rules for writing optimal SQL for performance

Writing Optimal SQL – What you should remember and avoid for writing high performance SQL applications? Performance is an important aspect of any database system, as it directly impacts the ability of a business to access and process its data in a timely and efficient manner. Some of the most critical areas where performance is […]

How checkpointing works in ClickHouse?

Understanding Checkpointing Process in ClickHouse Introduction – What is Checkpointing in Database Systems? Checkpointing is a process of periodically saving the state of a database system to disk, so that in the event of a failure, the system can be quickly restored to a known good state. In a database system, data is stored in […]

How query cache is implemented in Database Systems?

Understanding Query Cache Implementation in Database Systems In database systems, a query cache, also known as a result cache, is implemented by storing the result set of a query along with the query itself in a cache, so that if the same query is executed again, the cached result can be returned instead of executing […]