Base struct for log records that touch multi-pages. More...

#include <logrec.h>

Inheritance diagram for multi_page_log_t:

Public Member Functions
	multi_page_log_t (PageID page2_pid)

Public Attributes
lsn_t	_page2_prv

PageID	_page2_pid

uint32_t	_fill4

Detailed Description

Base struct for log records that touch multi-pages.

Such log records are so far always single-log system transaction that touches 2 pages. If possible, such log record should contain everything we physically need to recover either page without the other page. This is an important property because otherwise it imposes write-order-dependency and a careful recovery. In such a case "page2" is the data source page while "page" is the data destination page.

Note: a REDO operation of multi-page log must expect either of page/page2 are given. It must first check if which page is requested to recover, then apply right changes to the page.

Constructor & Destructor Documentation

§ multi_page_log_t()

multi_page_log_t::multi_page_log_t ( PageID page2_pid )

inline

Member Data Documentation

§ _fill4

uint32_t multi_page_log_t::_fill4

for alignment only.

§ _page2_pid

PageID multi_page_log_t::_page2_pid

Page ID of another page touched by the operation.

The documentation for this struct was generated from the following file:

src/sm/logrec.h