diff options
Diffstat (limited to 'innobase/include/trx0undo.h')
| -rw-r--r-- | innobase/include/trx0undo.h | 48 |
1 files changed, 43 insertions, 5 deletions
diff --git a/innobase/include/trx0undo.h b/innobase/include/trx0undo.h index 20002076cc3..bd7337e4f90 100644 --- a/innobase/include/trx0undo.h +++ b/innobase/include/trx0undo.h @@ -14,6 +14,7 @@ Created 3/26/1996 Heikki Tuuri #include "mtr0mtr.h" #include "trx0sys.h" #include "page0types.h" +#include "trx0xa.h" /*************************************************************************** Builds a roll pointer dulint. */ @@ -36,7 +37,7 @@ trx_undo_decode_roll_ptr( ibool* is_insert, /* out: TRUE if insert undo log */ ulint* rseg_id, /* out: rollback segment id */ ulint* page_no, /* out: page number */ - ulint* offset); /* out: offset of the undo entry within page */ + ulint* offset); /* out: offset of the undo entry within page */ /*************************************************************************** Returns TRUE if the roll pointer is of the insert type. */ UNIV_INLINE @@ -239,6 +240,18 @@ trx_undo_set_state_at_finish( trx_t* trx, /* in: transaction */ trx_undo_t* undo, /* in: undo log memory copy */ mtr_t* mtr); /* in: mtr */ +/********************************************************************** +Sets the state of the undo log segment at a transaction prepare. */ + +page_t* +trx_undo_set_state_at_prepare( +/*==========================*/ + /* out: undo log segment header page, + x-latched */ + trx_t* trx, /* in: transaction */ + trx_undo_t* undo, /* in: undo log memory copy */ + mtr_t* mtr); /* in: mtr */ + /************************************************************************** Adds the update undo log header as the first in the history list, and frees the memory object, or puts it to the list of cached update undo log @@ -295,7 +308,6 @@ trx_undo_parse_discard_latest( page_t* page, /* in: page or NULL */ mtr_t* mtr); /* in: mtr or NULL */ - /* Types of an undo log segment */ #define TRX_UNDO_INSERT 1 /* contains undo entries for inserts */ #define TRX_UNDO_UPDATE 2 /* contains undo entries for updates @@ -310,6 +322,8 @@ trx_undo_parse_discard_latest( #define TRX_UNDO_TO_PURGE 4 /* update undo segment will not be reused: it can be freed in purge when all undo data in it is removed */ +#define TRX_UNDO_PREPARED 5 /* contains an undo log of an + prepared transaction */ /* Transaction undo log memory object; this is protected by the undo_mutex in the corresponding transaction object */ @@ -332,6 +346,8 @@ struct trx_undo_struct{ field */ dulint trx_id; /* id of the trx assigned to the undo log */ + XID xid; /* X/Open XA transaction + identification */ ibool dict_operation; /* TRUE if a dict operation trx */ dulint table_id; /* if a dict operation, then the table id */ @@ -386,7 +402,8 @@ struct trx_undo_struct{ #define TRX_UNDO_PAGE_HDR_SIZE (6 + FLST_NODE_SIZE) /* An update undo segment with just one page can be reused if it has -< this number bytes used */ +< this number bytes used; we must leave space at least for one new undo +log header on the page */ #define TRX_UNDO_PAGE_REUSE_LIMIT (3 * UNIV_PAGE_SIZE / 4) @@ -436,7 +453,10 @@ page of an update undo log segment. */ log start, and therefore this is not necessarily the same as this log header end offset */ -#define TRX_UNDO_DICT_OPERATION 20 /* TRUE if the transaction is a table +#define TRX_UNDO_XID_EXISTS 20 /* TRUE if undo log header includes + X/Open XA transaction identification + XID */ +#define TRX_UNDO_DICT_TRANS 21 /* TRUE if the transaction is a table create, index create, or drop transaction: in recovery the transaction cannot be rolled back @@ -452,7 +472,25 @@ page of an update undo log segment. */ #define TRX_UNDO_HISTORY_NODE 34 /* If the log is put to the history list, the file list node is here */ /*-------------------------------------------------------------*/ -#define TRX_UNDO_LOG_HDR_SIZE (34 + FLST_NODE_SIZE) +#define TRX_UNDO_LOG_OLD_HDR_SIZE (34 + FLST_NODE_SIZE) + +/* Note: the writing of the undo log old header is coded by a log record +MLOG_UNDO_HDR_CREATE or MLOG_UNDO_HDR_REUSE. The appending of an XID to the +header is logged separately. In this sense, the XID is not really a member +of the undo log header. TODO: do not append the XID to the log header if XA +is not needed by the user. The XID wastes about 150 bytes of space in every +undo log. In the history list we may have millions of undo logs, which means +quite a large overhead. */ + +/* X/Open XA Transaction Identification (XID) */ + +#define TRX_UNDO_XA_FORMAT (TRX_UNDO_LOG_OLD_HDR_SIZE) +#define TRX_UNDO_XA_TRID_LEN (TRX_UNDO_XA_FORMAT + 4) +#define TRX_UNDO_XA_BQUAL_LEN (TRX_UNDO_XA_TRID_LEN + 4) +#define TRX_UNDO_XA_XID (TRX_UNDO_XA_BQUAL_LEN + 4) +/*--------------------------------------------------------------*/ +#define TRX_UNDO_LOG_XA_HDR_SIZE (TRX_UNDO_XA_XID + XIDDATASIZE) + /* Total size of the header with the XA XID */ #ifndef UNIV_NONINL #include "trx0undo.ic" |