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5a7553f36a
btr_lift_page_up() writes wrong page number (different by -1) for upper than father page. But in almost all of the cases, the father page should be root page, no upper pages. It is very rare path. In addition the leaf page should not be lifted unless the father page is root. Because the branch pages should not become the leaf pages. rb://1336 approved by Marko Makela.
173 lines
6 KiB
C
173 lines
6 KiB
C
/******************************************************
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Purge old versions
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(c) 1996 Innobase Oy
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Created 3/26/1996 Heikki Tuuri
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*******************************************************/
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#ifndef trx0purge_h
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#define trx0purge_h
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#include "univ.i"
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#include "trx0types.h"
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#include "mtr0mtr.h"
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#include "trx0sys.h"
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#include "que0types.h"
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#include "page0page.h"
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#include "usr0sess.h"
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#include "fil0fil.h"
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/* The global data structure coordinating a purge */
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extern trx_purge_t* purge_sys;
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/* A dummy undo record used as a return value when we have a whole undo log
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which needs no purge */
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extern trx_undo_rec_t trx_purge_dummy_rec;
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/************************************************************************
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Calculates the file address of an undo log header when we have the file
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address of its history list node. */
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UNIV_INLINE
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fil_addr_t
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trx_purge_get_log_from_hist(
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/*========================*/
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/* out: file address of the log */
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fil_addr_t node_addr); /* in: file address of the history
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list node of the log */
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/*********************************************************************
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Checks if trx_id is >= purge_view: then it is guaranteed that its update
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undo log still exists in the system. */
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ibool
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trx_purge_update_undo_must_exist(
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/*=============================*/
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/* out: TRUE if is sure that it is preserved, also
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if the function returns FALSE, it is possible that
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the undo log still exists in the system */
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dulint trx_id);/* in: transaction id */
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/************************************************************************
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Creates the global purge system control structure and inits the history
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mutex. */
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void
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trx_purge_sys_create(void);
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/*======================*/
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/************************************************************************
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Adds the update undo log as the first log in the history list. Removes the
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update undo log segment from the rseg slot if it is too big for reuse. */
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void
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trx_purge_add_update_undo_to_history(
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/*=================================*/
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trx_t* trx, /* in: transaction */
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page_t* undo_page, /* in: update undo log header page,
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x-latched */
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mtr_t* mtr); /* in: mtr */
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/************************************************************************
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Fetches the next undo log record from the history list to purge. It must be
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released with the corresponding release function. */
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trx_undo_rec_t*
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trx_purge_fetch_next_rec(
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/*=====================*/
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/* out: copy of an undo log record, or
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pointer to the dummy undo log record
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&trx_purge_dummy_rec if the whole undo log
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can skipped in purge; NULL if none left */
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dulint* roll_ptr,/* out: roll pointer to undo record */
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trx_undo_inf_t** cell, /* out: storage cell for the record in the
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purge array */
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mem_heap_t* heap); /* in: memory heap where copied */
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/***********************************************************************
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Releases a reserved purge undo record. */
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void
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trx_purge_rec_release(
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/*==================*/
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trx_undo_inf_t* cell); /* in: storage cell */
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/***********************************************************************
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This function runs a purge batch. */
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ulint
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trx_purge(void);
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/*===========*/
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/* out: number of undo log pages handled in
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the batch */
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/**********************************************************************
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Prints information of the purge system to stderr. */
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void
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trx_purge_sys_print(void);
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/*======================*/
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/* The control structure used in the purge operation */
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struct trx_purge_struct{
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ulint state; /* Purge system state */
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sess_t* sess; /* System session running the purge
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query */
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trx_t* trx; /* System transaction running the purge
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query: this trx is not in the trx list
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of the trx system and it never ends */
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que_t* query; /* The query graph which will do the
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parallelized purge operation */
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rw_lock_t latch; /* The latch protecting the purge view.
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A purge operation must acquire an
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x-latch here for the instant at which
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it changes the purge view: an undo
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log operation can prevent this by
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obtaining an s-latch here. */
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read_view_t* view; /* The purge will not remove undo logs
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which are >= this view (purge view) */
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mutex_t mutex; /* Mutex protecting the fields below */
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ulonglong n_pages_handled;/* Approximate number of undo log
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pages processed in purge */
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ulonglong handle_limit; /* Target of how many pages to get
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processed in the current purge */
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/*------------------------------*/
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/* The following two fields form the 'purge pointer' which advances
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during a purge, and which is used in history list truncation */
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dulint purge_trx_no; /* Purge has advanced past all
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transactions whose number is less
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than this */
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dulint purge_undo_no; /* Purge has advanced past all records
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whose undo number is less than this */
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#ifdef UNIV_DEBUG
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dulint done_trx_no; /* Indicate 'purge pointer' which have
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purged already accurately. */
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#endif /* UNIV_DEBUG */
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/*-----------------------------*/
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ibool next_stored; /* TRUE if the info of the next record
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to purge is stored below: if yes, then
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the transaction number and the undo
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number of the record are stored in
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purge_trx_no and purge_undo_no above */
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trx_rseg_t* rseg; /* Rollback segment for the next undo
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record to purge */
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ulint page_no; /* Page number for the next undo
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record to purge, page number of the
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log header, if dummy record */
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ulint offset; /* Page offset for the next undo
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record to purge, 0 if the dummy
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record */
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ulint hdr_page_no; /* Header page of the undo log where
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the next record to purge belongs */
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ulint hdr_offset; /* Header byte offset on the page */
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/*-----------------------------*/
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trx_undo_arr_t* arr; /* Array of transaction numbers and
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undo numbers of the undo records
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currently under processing in purge */
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mem_heap_t* heap; /* Temporary storage used during a
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purge: can be emptied after purge
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completes */
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};
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#define TRX_PURGE_ON 1 /* purge operation is running */
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#define TRX_STOP_PURGE 2 /* purge operation is stopped, or
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it should be stopped */
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#ifndef UNIV_NONINL
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#include "trx0purge.ic"
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#endif
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#endif
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