> For the complete documentation index, see [llms.txt](https://docs.tibero.com/prosync/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.tibero.com/prosync/administration/llob/llob-process.md).
# Llob Process
## Process 설명
Llob 프로세스는 Apply 프로세스의 요청에 따라 Source DB의 Long, Clob, Blob 등의 대용량 데이터를 전달하는 동작을 수행한다.
그림1. Llob 프로세스
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## Threads
### Control Thread
기동 시 다른 Thread 시작, 메시지 수신 및 전송 등의 작업을 수행한다. Apply Thread의 요청이 오는 경우, 적절한 Read Thread에 전달한다.
### Read Thread
Apply Thread의 요청에 따라 Source DB에 **flashback query**를 통해 llob 데이터를 조회하고 이를 Control Thread를 통해 요청한 Apply 프로세스에 전달한다.
해당 시점으로 **flashback query**를 할 수 없다면, 현재 시점의 데이터를 조회한다.
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