The needless repetition. Makes it really hard to read imho. It's note a language issue but one of concise thought. I'd argue you can reduce the amount of text by 50% while retaining almost all of the information.
e.g., instead of:
Transaction logs are an essential part of databases because they ensure that no data is lost even when a system failure occurs. They are a history log of all changes and actions in a database system. This ensures that no data is lost due to failures, such as a power failure or a server crash. The log contains sufficient information about each transaction that has already been executed, so the database server can recover the database cluster by replaying the changes and actions in the transaction log in the event of a server crash.
something like:
Transaction logs keep a record of all changes in a database. This allows data recovery in case of system failures like power outages or server crashes. They store enough information to replay transactions. This can restore the database to its last consistent state.
e.g., instead of:
Transaction logs are an essential part of databases because they ensure that no data is lost even when a system failure occurs. They are a history log of all changes and actions in a database system. This ensures that no data is lost due to failures, such as a power failure or a server crash. The log contains sufficient information about each transaction that has already been executed, so the database server can recover the database cluster by replaying the changes and actions in the transaction log in the event of a server crash.
something like:
Transaction logs keep a record of all changes in a database. This allows data recovery in case of system failures like power outages or server crashes. They store enough information to replay transactions. This can restore the database to its last consistent state.