Commit ff4507a9 authored by unknown's avatar unknown
Browse files

InnoDB: Implement fast TRUNCATE TABLE (Bug #7150) 


innobase/dict/dict0boot.c:
  Added DICT_SYS_INDEXES_TYPE_FIELD
innobase/dict/dict0crea.c:
  Added dict_truncate_index_tree()
innobase/include/dict0boot.h:
  Added DICT_SYS_INDEXES_TYPE_FIELD
innobase/include/dict0crea.h:
  Added dict_truncate_index_tree()
innobase/include/row0mysql.h:
  Added row_truncate_table_for_mysql()
innobase/row/row0mysql.c:
  Added row_truncate_table_for_mysql()
sql/ha_innodb.cc:
  Added ha_innobase::delete_all_rows() in order to
  implement fast TRUNCATE TABLE
sql/ha_innodb.h:
  Added ha_innobase::delete_all_rows() in order to
  implement fast TRUNCATE TABLE
parent 0b7895b9

innobase/dict/dict0boot.c

+3 −0
Original line number Diff line number Diff line
@@ -332,6 +332,9 @@ dict_boot(void) 
#endif

#if DICT_SYS_INDEXES_SPACE_NO_FIELD != 5 + 2

#error "DICT_SYS_INDEXES_SPACE_NO_FIELD != 5 + 2"

#endif

#if DICT_SYS_INDEXES_TYPE_FIELD != 4 + 2

#error "DICT_SYS_INDEXES_TYPE_FIELD != 4 + 2"

#endif



	table->id = DICT_INDEXES_ID;

innobase/dict/dict0crea.c

+95 −0
Original line number Diff line number Diff line
@@ -706,6 +706,101 @@ dict_drop_index_tree( 
				DICT_SYS_INDEXES_PAGE_NO_FIELD, FIL_NULL, mtr);

}



/***********************************************************************

Truncates the index tree associated with a row in SYS_INDEXES table. */



void

dict_truncate_index_tree(

/*=====================*/

	dict_table_t*	table,	/* in: the table the index belongs to */

	rec_t*		rec,	/* in: record in the clustered index of

				SYS_INDEXES table */

	mtr_t*		mtr)	/* in: mtr having the latch

				on the record page */

{

	ulint		root_page_no;

	ulint		space;

	ulint		type;

	dulint		index_id;

	byte*		ptr;

	ulint		len;

	ibool		comp;

	dict_index_t*	index;



#ifdef UNIV_SYNC_DEBUG

	ut_ad(mutex_own(&(dict_sys->mutex)));

#endif /* UNIV_SYNC_DEBUG */



	ut_a(!dict_sys->sys_indexes->comp);

	ptr = rec_get_nth_field_old(rec, DICT_SYS_INDEXES_PAGE_NO_FIELD, &len);



	ut_ad(len == 4);



	root_page_no = mtr_read_ulint(ptr, MLOG_4BYTES, mtr);



	if (root_page_no == FIL_NULL) {

		/* The tree has been freed. */



		return;

	}



	ptr = rec_get_nth_field_old(rec,

				DICT_SYS_INDEXES_SPACE_NO_FIELD, &len);



	ut_ad(len == 4);



	space = mtr_read_ulint(ptr, MLOG_4BYTES, mtr);



	if (!fil_tablespace_exists_in_mem(space)) {

		/* It is a single table tablespace and the .ibd file is

		missing: do nothing */



		return;

	}



	ptr = rec_get_nth_field_old(rec,

				DICT_SYS_INDEXES_TYPE_FIELD, &len);

	ut_ad(len == 4);

	type = mach_read_from_4(ptr);



	ptr = rec_get_nth_field_old(rec, 1, &len);

	ut_ad(len == 8);

	index_id = mach_read_from_8(ptr);



	/* We free all the pages but the root page first; this operation

	may span several mini-transactions */



	btr_free_but_not_root(space, root_page_no);



	/* Then we free the root page in the same mini-transaction where

	we create the b-tree and write its new root page number to the

	appropriate field in the SYS_INDEXES record: this mini-transaction

	marks the B-tree totally truncated */



	comp = page_is_comp(btr_page_get(

				space, root_page_no, RW_X_LATCH, mtr));



	btr_free_root(space, root_page_no, mtr);



	/* Find the index corresponding to this SYS_INDEXES record. */

	for (index = UT_LIST_GET_FIRST(table->indexes);

			index;

			index = UT_LIST_GET_NEXT(indexes, index)) {

		if (!ut_dulint_cmp(index->id, index_id)) {

			break;

		}

	}



	root_page_no = btr_create(type, space, index_id, comp, mtr);

	if (index) {

		index->page_no = root_page_no;

	}



	page_rec_write_index_page_no(rec,

				DICT_SYS_INDEXES_PAGE_NO_FIELD,

				root_page_no, mtr);

}



/*************************************************************************

Creates a table create graph. */

innobase/include/dict0boot.h

+1 −0
Original line number Diff line number Diff line
@@ -119,6 +119,7 @@ dict_create(void); 
clustered index */

#define DICT_SYS_INDEXES_PAGE_NO_FIELD	 8

#define DICT_SYS_INDEXES_SPACE_NO_FIELD	 7

#define DICT_SYS_INDEXES_TYPE_FIELD	 6

					

/* When a row id which is zero modulo this number (which must be a power of

two) is assigned, the field DICT_HDR_ROW_ID on the dictionary header page is

innobase/include/dict0crea.h

+11 −0
Original line number Diff line number Diff line
@@ -54,6 +54,17 @@ dict_create_index_step( 
				/* out: query thread to run next or NULL */

	que_thr_t*	thr);	/* in: query thread */

/***********************************************************************

Truncates the index tree associated with a row in SYS_INDEXES table. */



void

dict_truncate_index_tree(

/*=====================*/

	dict_table_t*	table,	/* in: the table the index belongs to */

	rec_t*		rec,	/* in: record in the clustered index of

				SYS_INDEXES table */

	mtr_t*		mtr);	/* in: mtr having the latch

				on the record page */

/***********************************************************************

Drops the index tree associated with a row in SYS_INDEXES table. */



void

innobase/include/row0mysql.h

+9 −0
Original line number Diff line number Diff line
@@ -363,6 +363,15 @@ row_get_background_drop_list_len_low(void); 
/*======================================*/

					/* out: how many tables in list */

/*************************************************************************

Truncates a table for MySQL. */



int

row_truncate_table_for_mysql(

/*=========================*/

				/* out: error code or DB_SUCCESS */

	dict_table_t*	table,	/* in: table handle */

	trx_t*		trx);	/* in: transaction handle */

/*************************************************************************

Drops a table for MySQL. If the name of the dropped table ends to

characters INNODB_MONITOR, then this also stops printing of monitor

output by the master thread. */