diff options
Diffstat (limited to 'src/include/access/nbtxlog.h')
| -rw-r--r-- | src/include/access/nbtxlog.h | 28 |
1 files changed, 18 insertions, 10 deletions
diff --git a/src/include/access/nbtxlog.h b/src/include/access/nbtxlog.h index 7ae5c98c2b8..3df34fcda2d 100644 --- a/src/include/access/nbtxlog.h +++ b/src/include/access/nbtxlog.h @@ -13,6 +13,7 @@ #ifndef NBTXLOG_H #define NBTXLOG_H +#include "access/transam.h" #include "access/xlogreader.h" #include "lib/stringinfo.h" #include "storage/off.h" @@ -52,7 +53,7 @@ typedef struct xl_btree_metadata uint32 level; BlockNumber fastroot; uint32 fastlevel; - TransactionId oldest_btpo_xact; + uint32 last_cleanup_num_delpages; float8 last_cleanup_num_heap_tuples; bool allequalimage; } xl_btree_metadata; @@ -187,7 +188,7 @@ typedef struct xl_btree_reuse_page { RelFileNode node; BlockNumber block; - TransactionId latestRemovedXid; + FullTransactionId latestRemovedFullXid; } xl_btree_reuse_page; #define SizeOfBtreeReusePage (sizeof(xl_btree_reuse_page)) @@ -282,9 +283,12 @@ typedef struct xl_btree_mark_page_halfdead #define SizeOfBtreeMarkPageHalfDead (offsetof(xl_btree_mark_page_halfdead, topparent) + sizeof(BlockNumber)) /* - * This is what we need to know about deletion of a btree page. Note we do - * not store any content for the deleted page --- it is just rewritten as empty - * during recovery, apart from resetting the btpo.xact. + * This is what we need to know about deletion of a btree page. Note that we + * only leave behind a small amount of bookkeeping information in deleted + * pages (deleted pages must be kept around as tombstones for a while). It is + * convenient for the REDO routine to regenerate its target page from scratch. + * This is why WAL record describes certain details that are actually directly + * available from the target page. * * Backup Blk 0: target block being deleted * Backup Blk 1: target block's left sibling, if any @@ -296,20 +300,24 @@ typedef struct xl_btree_unlink_page { BlockNumber leftsib; /* target block's left sibling, if any */ BlockNumber rightsib; /* target block's right sibling */ + uint32 level; /* target block's level */ + FullTransactionId safexid; /* target block's BTPageSetDeleted() XID */ /* - * Information needed to recreate the leaf page, when target is an - * internal page. + * Information needed to recreate a half-dead leaf page with correct + * topparent link. The fields are only used when deletion operation's + * target page is an internal page. REDO routine creates half-dead page + * from scratch to keep things simple (this is the same convenient + * approach used for the target page itself). */ BlockNumber leafleftsib; BlockNumber leafrightsib; - BlockNumber topparent; /* next child down in the subtree */ + BlockNumber leaftopparent; /* next child down in the subtree */ - TransactionId btpo_xact; /* value of btpo.xact for use in recovery */ /* xl_btree_metadata FOLLOWS IF XLOG_BTREE_UNLINK_PAGE_META */ } xl_btree_unlink_page; -#define SizeOfBtreeUnlinkPage (offsetof(xl_btree_unlink_page, btpo_xact) + sizeof(TransactionId)) +#define SizeOfBtreeUnlinkPage (offsetof(xl_btree_unlink_page, leaftopparent) + sizeof(BlockNumber)) /* * New root log record. There are zero tuples if this is to establish an |