recent WAL entry related to this page. They are followed by three 2-byte integer fields (pd_lower, pd_upper, and pd_special). These contain byte offsets from the page start to the start of unallocated space end of unallocated space, and to the start of the special space. The last 2 bytes of the page header, pd_pagesize_version, store both the page size and 1. Actually, index access methods need not use this Type Length Description pd_lsn XLogRecPtr 8 bytes LSN: next byte after last byte of xlog record for last change to this page pd_tli TimeLineID 4 bytes TLI of last change pd_lower LocationIndex 2 bytes

recent WAL entry related to this page. They are followed by three 2-byte integer fields (pd_lower, pd_upper, and pd_special). These contain byte offsets from the page start to the start of unallocated space end of unallocated space, and to the start of the special space. The last 2 bytes of the page header, pd_pagesize_version, store both the page size and a version indicator. Beginning with PostgreSQL 8.0 the Type Length Description pd_lsn XLogRecPtr 8 bytes LSN: next byte after last byte of xlog record for last change to this page pd_tli TimeLineID 4 bytes TLI of last change pd_lower LocationIndex 2 bytes

recent WAL entry related to this page. They are followed by three 2-byte integer fields (pd_lower, pd_upper, and pd_special). These contain byte offsets from the page start to the start of unallocated space end of unallocated space, and to the start of the special space. The last 2 bytes of the page header, pd_pagesize_version, store both the page size and a version indicator. Beginning with PostgreSQL 8.1 the Type Length Description pd_lsn XLogRecPtr 8 bytes LSN: next byte after last byte of xlog record for last change to this page pd_tli TimeLineID 4 bytes TLI of last change pd_lower LocationIndex 2 bytes

recent WAL entry related to this page. They are followed by three 2-byte integer fields (pd_lower, pd_upper, and pd_special). These contain byte offsets from the page start to the start of unallocated space end of unallocated space, and to the start of the special space. The last 2 bytes of the page header, pd_pagesize_version, store both the page size and a version indicator. Beginning with PostgreSQL 8.1 the Type Length Description pd_lsn XLogRecPtr 8 bytes LSN: next byte after last byte of xlog record for last change to this page pd_tli TimeLineID 4 bytes TLI of last change pd_lower LocationIndex 2 bytes

to be modified have standard layout, and in particular that there is no useful data between pd_lower and pd_upper. • Since you are modifying copies of buffer pages, GenericXLogStart() does not start a is a 2-byte field containing flag bits. This is followed by three 2-byte integer fields (pd_lower, pd_upper, and pd_special). These contain 1 Actually, index access methods need not use this page format end of unallocated space, and to the start of the special space. The next 2 bytes of the page header, pd_pagesize_version, store both the page size and a version indicator. Beginning with PostgreSQL 8.3 the

to be modified have standard layout, and in particular that there is no useful data between pd_lower and pd_upper. • Since you are modifying copies of buffer pages, GenericXLogStart() does not start a is a 2-byte field containing flag bits. This is followed by three 2-byte integer fields (pd_lower, pd_upper, and pd_special). These contain byte offsets from the page start to the start of unallocated space end of unallocated space, and to the start of the special space. The next 2 bytes of the page header, pd_pagesize_version, store both the page size and a version indicator. Beginning with PostgreSQL 8.3 the

to be modified have standard layout, and in particular that there is no useful data between pd_lower and pd_upper. 2278 Chapter 60. Generic WAL Records • Since you are modifying copies of buffer pages is a 2-byte field containing flag bits. This is followed by three 2-byte integer fields (pd_lower, pd_upper, and pd_special). These contain byte offsets from the page start to the start of unallocated space end of unallocated space, and to the start of the special space. The next 2 bytes of the page header, pd_pagesize_version, store both the page size and a version indicator. Beginning with PostgreSQL 8.3 the

to be modified have standard layout, and in particular that there is no useful data between pd_lower and pd_upper. • Since you are modifying copies of buffer pages, GenericXLogStart() does not start a is a 2-byte field containing flag bits. This is followed by three 2-byte integer fields (pd_lower, pd_upper, and pd_special). These contain byte offsets from the page start to the start of unallocated space end of unallocated space, and to the start of the special space. The next 2 bytes of the page header, pd_pagesize_version, store both the page size and a version indicator. Beginning with PostgreSQL 8.3 the

\set offset 256 postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset AS lsn FROM pg_split_walfile_name(:'file_name') pd, pg_show_all_settings() ps WHERE ps.name = to be modified have standard layout, and in particular that there is no useful data between pd_lower and pd_upper. • Since you are modifying copies of buffer pages, GenericXLogStart() does not start a is a 2-byte field containing flag bits. This is followed by three 2-byte integer fields (pd_lower, pd_upper, and pd_special). These contain byte offsets from the page start to the start of unallocated space

\set offset 256 postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset AS lsn FROM pg_split_walfile_name(:'file_name') pd, pg_show_all_settings() ps WHERE ps.name = to be modified have standard layout, and in particular that there is no useful data between pd_lower and pd_upper. 2451 Generic WAL Records • Since you are modifying copies of buffer pages, GenericXLogStart() is a 2-byte field containing flag bits. This is followed by three 2-byte integer fields (pd_lower, pd_upper, and pd_special). These contain byte offsets from the page start to the start of unallocated space