Merge mysql.com:/home/cps/mysql/trees/mysql-5.0

into mysql.com:/home/cps/mysql/devel/innotask/mysql-5.0-inno-final

innobase/buf/buf0buf.c

@@ -2136,6 +2136,30 @@ buf_print(void)
 	ut_a(buf_validate());
 }	
 
+/*************************************************************************
+Returns the number of latched pages in the buffer pool. */
+
+ulint
+buf_get_latched_pages_number(void)
+{
+        buf_block_t* block;
+        ulint i;
+        ulint fixed_pages_number = 0;
+
+        mutex_enter(&(buf_pool->mutex));
+
+        for (i = 0; i < buf_pool->curr_size; i++) {
+
+               block = buf_pool_get_nth_block(buf_pool, i);
+
+               if ((block->buf_fix_count != 0) || (block->io_fix != 0))
+                       fixed_pages_number++;
+        }
+
+        mutex_exit(&(buf_pool->mutex));
+        return fixed_pages_number;
+}
+
 /*************************************************************************
 Returns the number of pending buf pool ios. */
 

innobase/buf/buf0flu.c

@@ -273,6 +273,10 @@ buf_flush_buffered_writes(void)
 		}
 	}
 
+        /* increment the doublewrite flushed pages counter */
+        srv_dblwr_pages_written+= trx_doublewrite->first_free;
+        srv_dblwr_writes++;
+        
 	if (trx_doublewrite->first_free > TRX_SYS_DOUBLEWRITE_BLOCK_SIZE) {
 		len = TRX_SYS_DOUBLEWRITE_BLOCK_SIZE * UNIV_PAGE_SIZE;
 	} else {
@@ -901,6 +905,9 @@ buf_flush_batch(
 			(ulong) page_count);
 	}
 	
+        if (page_count != ULINT_UNDEFINED)
+          srv_buf_pool_flushed+= page_count;
+
 	return(page_count);
 }
 

innobase/buf/buf0lru.c

@@ -432,6 +432,7 @@ buf_LRU_get_free_block(void)
 	/* No free block was found: try to flush the LRU list */
 
 	buf_flush_free_margin();
+        ++srv_buf_pool_wait_free;
 
 	os_aio_simulated_wake_handler_threads();
 

innobase/buf/buf0rea.c

@@ -20,6 +20,10 @@ Created 11/5/1995 Heikki Tuuri
 #include "os0file.h"
 #include "srv0start.h"
 
+extern ulint srv_read_ahead_rnd;
+extern ulint srv_read_ahead_seq;
+extern ulint srv_buf_pool_reads;
+
 /* The size in blocks of the area where the random read-ahead algorithm counts
 the accessed pages when deciding whether to read-ahead */
 #define	BUF_READ_AHEAD_RANDOM_AREA	BUF_READ_AHEAD_AREA
@@ -291,6 +295,7 @@ buf_read_ahead_random(
 		       				(ulong) count);
 	}
 
+        ++srv_read_ahead_rnd;
 	return(count);
 }
 
@@ -323,6 +328,7 @@ buf_read_page(
 
 	count2 = buf_read_page_low(&err, TRUE, BUF_READ_ANY_PAGE, space,
 					tablespace_version, offset);
+        srv_buf_pool_reads+= count2;
 	if (err == DB_TABLESPACE_DELETED) {
 	        ut_print_timestamp(stderr);
 		fprintf(stderr,
@@ -575,6 +581,7 @@ buf_read_ahead_linear(
 		(ulong) space, (ulong) offset, (ulong) count);
 	}
 
+        ++srv_read_ahead_seq;
 	return(count);
 }
 

innobase/fil/fil0fil.c

@@ -88,6 +88,9 @@ but in the MySQL Embedded Server Library and ibbackup it is not the default
 directory, and we must set the base file path explicitly */
 const char*	fil_path_to_mysql_datadir	= ".";
 
+/* The number of fsyncs done to the log */
+ulint	fil_n_log_flushes                       = 0;
+
 ulint	fil_n_pending_log_flushes		= 0;
 ulint	fil_n_pending_tablespace_flushes	= 0;
 
@@ -3671,6 +3674,12 @@ fil_io(
 		mode = OS_AIO_NORMAL;
 	}
 
+        if (type == OS_FILE_READ) {
+                srv_data_read+= len;
+        } else if (type == OS_FILE_WRITE) {
+                srv_data_written+= len;
+        }
+
 	/* Reserve the fil_system mutex and make sure that we can open at
 	least one file while holding it, if the file is not already open */
 
@@ -3956,6 +3965,7 @@ fil_flush(
 				fil_n_pending_tablespace_flushes++;
 			} else {
 				fil_n_pending_log_flushes++;
+				fil_n_log_flushes++;
 			}
 #ifdef __WIN__
 			if (node->is_raw_disk) {

innobase/include/buf0buf.h

@@ -58,6 +58,8 @@ extern buf_pool_t* 	buf_pool; 	/* The buffer pool of the database */
 extern ibool		buf_debug_prints;/* If this is set TRUE, the program
 					prints info whenever read or flush
 					occurs */
+extern ulint srv_buf_pool_write_requests; /* variable to count write request
+                                          issued */
 
 /************************************************************************
 Creates the buffer pool. */
@@ -497,6 +499,12 @@ void
 buf_print(void);
 /*============*/
 /*************************************************************************
+Returns the number of latched pages in the buffer pool. */
+
+ulint
+buf_get_latched_pages_number(void);
+/*==============================*/
+/*************************************************************************
 Returns the number of pending buf pool ios. */
 
 ulint

innobase/include/buf0flu.ic

@@ -61,6 +61,8 @@ buf_flush_note_modification(
 		ut_ad(ut_dulint_cmp(block->oldest_modification,
 							mtr->start_lsn) <= 0);
 	}
+
+        ++srv_buf_pool_write_requests;
 }
 
 /************************************************************************

innobase/include/fil0fil.h

@@ -89,6 +89,8 @@ extern fil_addr_t	fil_addr_null;
 #define FIL_TABLESPACE 		501
 #define FIL_LOG			502
 
+extern ulint	fil_n_log_flushes;
+
 extern ulint	fil_n_pending_log_flushes;
 extern ulint	fil_n_pending_tablespace_flushes;
 

innobase/include/os0file.h

@@ -24,6 +24,9 @@ extern ibool	os_aio_print_debug;
 extern ulint	os_file_n_pending_preads;
 extern ulint	os_file_n_pending_pwrites;
 
+extern ulint    os_n_pending_reads;
+extern ulint    os_n_pending_writes;
+
 #ifdef __WIN__
 
 /* We define always WIN_ASYNC_IO, and check at run-time whether

innobase/include/srv0srv.h

@@ -184,6 +184,63 @@ i/o handler thread */
 extern const char* srv_io_thread_op_info[];
 extern const char* srv_io_thread_function[];
 
+/* the number of the log write requests done */
+extern ulint srv_log_write_requests;
+
+/* the number of physical writes to the log performed */
+extern ulint srv_log_writes;
+
+/* amount of data written to the log files in bytes */
+extern ulint srv_os_log_written;
+
+/* amount of writes being done to the log files */
+extern ulint srv_os_log_pending_writes;
+
+/* we increase this counter, when there we don't have enough space in the
+log buffer and have to flush it */
+extern ulint srv_log_waits;
+
+/* variable that counts amount of data read in total (in bytes) */
+extern ulint srv_data_read;
+
+/* here we count the amount of data written in total (in bytes) */
+extern ulint srv_data_written;
+
+/* this variable counts the amount of times, when the doublewrite buffer
+was flushed */
+extern ulint srv_dblwr_writes;
+
+/* here we store the number of pages that have been flushed to the
+doublewrite buffer */
+extern ulint srv_dblwr_pages_written;
+
+/* in this variable we store the number of write requests issued */
+extern ulint srv_buf_pool_write_requests;
+
+/* here we store the number of times when we had to wait for a free page
+in the buffer pool. It happens when the buffer pool is full and we need
+to make a flush, in order to be able to read or create a page. */
+extern ulint srv_buf_pool_wait_free;
+
+/* variable to count the number of pages that were written from the
+buffer pool to disk */
+extern ulint srv_buf_pool_flushed;
+
+/* variable to count the number of buffer pool reads that led to the
+reading of a disk page */
+extern ulint srv_buf_pool_reads;
+
+/* variable to count the number of sequential read-aheads were done */
+extern ulint srv_read_ahead_seq;
+
+/* variable to count the number of random read-aheads were done */
+extern ulint srv_read_ahead_rnd;
+
+/* In this structure we store status variables to be passed to MySQL */
+typedef struct export_var_struct export_struc;
+
+extern export_struc export_vars;
+
 typedef struct srv_sys_struct	srv_sys_t;
 
 /* The server system */
@@ -400,7 +457,12 @@ void
 srv_printf_innodb_monitor(
 /*======================*/
 	FILE*	file);	/* in: output stream */
+/************************************************************************
+Function to pass InnoDB status variables to MySQL */
 
+void
+srv_export_innodb_status(void);
+/*=====================*/
 
 /* Types for the threads existing in the system. Threads of types 4 - 9
 are called utility threads. Note that utility threads are mainly disk
@@ -426,6 +488,48 @@ typedef struct srv_slot_struct	srv_slot_t;
 /* Thread table is an array of slots */
 typedef srv_slot_t	srv_table_t;
 
+/* In this structure we store status variables to be passed to MySQL */
+struct export_var_struct{
+        ulint innodb_data_pending_reads;
+        ulint innodb_data_pending_writes;
+        ulint innodb_data_pending_fsyncs;
+        ulint innodb_data_fsyncs;
+        ulint innodb_data_read;
+        ulint innodb_data_writes;
+        ulint innodb_data_written;
+        ulint innodb_data_reads;
+        ulint innodb_buffer_pool_pages_total;
+        ulint innodb_buffer_pool_pages_data;
+        ulint innodb_buffer_pool_pages_dirty;
+        ulint innodb_buffer_pool_pages_misc;
+        ulint innodb_buffer_pool_pages_free;
+        ulint innodb_buffer_pool_pages_latched;
+        ulint innodb_buffer_pool_read_requests;
+        ulint innodb_buffer_pool_reads;
+        ulint innodb_buffer_pool_wait_free;
+        ulint innodb_buffer_pool_pages_flushed;
+        ulint innodb_buffer_pool_write_requests;
+        ulint innodb_buffer_pool_read_ahead_seq;
+        ulint innodb_buffer_pool_read_ahead_rnd;
+        ulint innodb_dblwr_pages_written;
+        ulint innodb_dblwr_writes;
+        ulint innodb_log_waits;
+        ulint innodb_log_write_requests;
+        ulint innodb_log_writes;
+        ulint innodb_os_log_written;
+        ulint innodb_os_log_fsyncs;
+        ulint innodb_os_log_pending_writes;
+        ulint innodb_os_log_pending_fsyncs;
+        ulint innodb_page_size;
+        ulint innodb_pages_created;
+        ulint innodb_pages_read;
+        ulint innodb_pages_written;
+        ulint innodb_rows_read;
+        ulint innodb_rows_inserted;
+        ulint innodb_rows_updated;
+        ulint innodb_rows_deleted;
+};
+
 /* The server system struct */
 struct srv_sys_struct{
 	os_event_t	operational;	/* created threads must wait for the

innobase/log/log0log.c

@@ -190,6 +190,8 @@ log_reserve_and_open(
 
 		log_buffer_flush_to_disk();
 
+                srv_log_waits++;
+
 		ut_ad(++count < 50);
 
 		goto loop;
@@ -292,6 +294,8 @@ log_write_low(
 	if (str_len > 0) {
 		goto part_loop;
 	}
+        
+        srv_log_write_requests++;
 }
 
 /****************************************************************
@@ -1112,11 +1116,15 @@ log_group_file_header_flush(
 	if (log_do_write) {
 		log_sys->n_log_ios++;	
 		
+                srv_os_log_pending_writes++;
+                
 		fil_io(OS_FILE_WRITE | OS_FILE_LOG, TRUE, group->space_id,
 				dest_offset / UNIV_PAGE_SIZE,
 				dest_offset % UNIV_PAGE_SIZE,
 				OS_FILE_LOG_BLOCK_SIZE,
 				buf, group);
+
+                srv_os_log_pending_writes--;
 	}
 }
 
@@ -1181,6 +1189,8 @@ log_group_write_buf(
 
 		log_group_file_header_flush(group,
 				next_offset / group->file_size, start_lsn);
+                srv_os_log_written+= OS_FILE_LOG_BLOCK_SIZE;
+                srv_log_writes++;
 	}
 
 	if ((next_offset % group->file_size) + len > group->file_size) {
@@ -1225,9 +1235,16 @@ log_group_write_buf(
 	if (log_do_write) {
 		log_sys->n_log_ios++;	
 
+                srv_os_log_pending_writes++;                
+                
 		fil_io(OS_FILE_WRITE | OS_FILE_LOG, TRUE, group->space_id,
 			next_offset / UNIV_PAGE_SIZE,
 			next_offset % UNIV_PAGE_SIZE, write_len, buf, group);
+
+                srv_os_log_pending_writes--;
+
+                srv_os_log_written+= write_len; 
+                srv_log_writes++;
 	}
 
 	if (write_len < len) {

innobase/os/os0file.c

@@ -155,6 +155,10 @@ os_mutex_t os_file_count_mutex;
 ulint	os_file_n_pending_preads  = 0;
 ulint	os_file_n_pending_pwrites = 0;
 
+/* These are not protected by any mutex */
+ulint os_n_pending_writes = 0;
+ulint os_n_pending_reads = 0;
+
 /***************************************************************************
 Gets the operating system version. Currently works only on Windows. */
 
@@ -1987,8 +1991,12 @@ os_file_read(
 		goto error_handling;
 	} 
 	
+        os_n_pending_reads++;
+        
 	ret = ReadFile(file, buf, n, &len, NULL);
 
+        os_n_pending_reads--;
+
 	os_mutex_exit(os_file_seek_mutexes[i]);
 	
 	if (ret && len == n) {
@@ -2001,8 +2009,12 @@ os_file_read(
 	os_bytes_read_since_printout += n;
 
 try_again:
+        os_n_pending_reads++;
+        
 	ret = os_file_pread(file, buf, n, offset, offset_high);
 
+        os_n_pending_reads--;
+
 	if ((ulint)ret == n) {
 
 		return(TRUE);
@@ -2090,8 +2102,12 @@ os_file_read_no_error_handling(
 		goto error_handling;
 	} 
 	
+        os_n_pending_reads++;
+        
 	ret = ReadFile(file, buf, n, &len, NULL);
 
+        os_n_pending_reads--;
+        
 	os_mutex_exit(os_file_seek_mutexes[i]);
 	
 	if (ret && len == n) {
@@ -2104,8 +2120,12 @@ os_file_read_no_error_handling(
 	os_bytes_read_since_printout += n;
 
 try_again:
+        os_n_pending_reads++;
+
 	ret = os_file_pread(file, buf, n, offset, offset_high);
 
+        os_n_pending_reads--;
+
 	if ((ulint)ret == n) {
 
 		return(TRUE);
@@ -2187,7 +2207,11 @@ os_file_write(
 		return(FALSE);
 	} 
 
+        os_n_pending_writes++;
+        
 	ret = WriteFile(file, buf, n, &len, NULL);
+
+        os_n_pending_writes--;
 	
 	/* Always do fsync to reduce the probability that when the OS crashes,
 	a database page is only partially physically written to disk. */
@@ -2248,8 +2272,12 @@ os_file_write(
 #else
 	ssize_t	ret;
 	
+        os_n_pending_writes++;
+        
 	ret = os_file_pwrite(file, buf, n, offset, offset_high);
 
+        os_n_pending_writes--;
+        
 	if ((ulint)ret == n) {
 
 		return(TRUE);

innobase/srv/srv0srv.c

@@ -186,6 +186,61 @@ that during a time of heavy update/insert activity. */
 
 ulint	srv_max_buf_pool_modified_pct	= 90;
 
+/* variable counts amount of data read in total (in bytes) */
+ulint srv_data_read = 0;
+
+/* here we count the amount of data written in total (in bytes) */
+ulint srv_data_written = 0;
+
+/* the number of the log write requests done */
+ulint srv_log_write_requests = 0;
+
+/* the number of physical writes to the log performed */
+ulint srv_log_writes = 0;
+
+/* amount of data written to the log files in bytes */
+ulint srv_os_log_written = 0;
+
+/* amount of writes being done to the log files */
+ulint srv_os_log_pending_writes = 0;
+
+/* we increase this counter, when there we don't have enough space in the
+log buffer and have to flush it */
+ulint srv_log_waits = 0;
+
+/* this variable counts the amount of times, when the doublewrite buffer
+was flushed */
+ulint srv_dblwr_writes = 0;
+
+/* here we store the number of pages that have been flushed to the
+doublewrite buffer */
+ulint srv_dblwr_pages_written = 0;
+
+/* in this variable we store the number of write requests issued */
+ulint srv_buf_pool_write_requests = 0;
+
+/* here we store the number of times when we had to wait for a free page
+in the buffer pool. It happens when the buffer pool is full and we need
+to make a flush, in order to be able to read or create a page. */
+ulint srv_buf_pool_wait_free = 0;
+
+/* variable to count the number of pages that were written from buffer
+pool to the disk */
+ulint srv_buf_pool_flushed = 0;
+
+/* variable to count the number of buffer pool reads that led to the
+reading of a disk page */
+ulint srv_buf_pool_reads = 0;
+
+/* variable to count the number of sequential read-aheads */
+ulint srv_read_ahead_seq = 0;
+
+/* variable to count the number of random read-aheads */
+ulint srv_read_ahead_rnd = 0;
+
+/* structure to pass status variables to MySQL */
+export_struc export_vars;
+
 /* If the following is != 0 we do not allow inserts etc. This protects
 the user from forgetting the innodb_force_recovery keyword to my.cnf */
 
@@ -1619,6 +1674,57 @@ srv_printf_innodb_monitor(
 	fflush(file);
 }
 
+/**********************************************************************
+Function to pass InnoDB status variables to MySQL */
+
+void
+srv_export_innodb_status(void)
+{
+
+        mutex_enter(&srv_innodb_monitor_mutex);
+        export_vars.innodb_data_pending_reads= os_n_pending_reads;
+        export_vars.innodb_data_pending_writes= os_n_pending_writes;
+        export_vars.innodb_data_pending_fsyncs= 
+                fil_n_pending_log_flushes + fil_n_pending_tablespace_flushes;
+        export_vars.innodb_data_fsyncs= os_n_fsyncs;
+        export_vars.innodb_data_read= srv_data_read;
+        export_vars.innodb_data_reads= os_n_file_reads;
+        export_vars.innodb_data_writes= os_n_file_writes;
+        export_vars.innodb_data_written= srv_data_written;
+        export_vars.innodb_buffer_pool_read_requests= buf_pool->n_page_gets;
+        export_vars.innodb_buffer_pool_write_requests= srv_buf_pool_write_requests;
+        export_vars.innodb_buffer_pool_wait_free= srv_buf_pool_wait_free;
+        export_vars.innodb_buffer_pool_pages_flushed= srv_buf_pool_flushed;
+        export_vars.innodb_buffer_pool_reads= srv_buf_pool_reads;
+        export_vars.innodb_buffer_pool_read_ahead_rnd= srv_read_ahead_rnd;
+        export_vars.innodb_buffer_pool_read_ahead_seq= srv_read_ahead_seq;
+        export_vars.innodb_buffer_pool_pages_data= UT_LIST_GET_LEN(buf_pool->LRU);
+        export_vars.innodb_buffer_pool_pages_dirty= UT_LIST_GET_LEN(buf_pool->flush_list);
+        export_vars.innodb_buffer_pool_pages_free= UT_LIST_GET_LEN(buf_pool->free);
+        export_vars.innodb_buffer_pool_pages_latched= buf_get_latched_pages_number();
+        export_vars.innodb_buffer_pool_pages_total= buf_pool->curr_size;
+        export_vars.innodb_buffer_pool_pages_misc= buf_pool->max_size -
+          UT_LIST_GET_LEN(buf_pool->LRU) - UT_LIST_GET_LEN(buf_pool->free);
+        export_vars.innodb_page_size= UNIV_PAGE_SIZE;
+        export_vars.innodb_log_waits= srv_log_waits;
+        export_vars.innodb_os_log_written= srv_os_log_written;
+        export_vars.innodb_os_log_fsyncs= fil_n_log_flushes;
+        export_vars.innodb_os_log_pending_fsyncs= fil_n_pending_log_flushes;
+        export_vars.innodb_os_log_pending_writes= srv_os_log_pending_writes;
+        export_vars.innodb_log_write_requests= srv_log_write_requests;
+        export_vars.innodb_log_writes= srv_log_writes;
+        export_vars.innodb_dblwr_pages_written= srv_dblwr_pages_written;
+        export_vars.innodb_dblwr_writes= srv_dblwr_writes;
+        export_vars.innodb_pages_created= buf_pool->n_pages_created;
+        export_vars.innodb_pages_read= buf_pool->n_pages_read;
+        export_vars.innodb_pages_written= buf_pool->n_pages_written;
+        export_vars.innodb_rows_read= srv_n_rows_read;
+        export_vars.innodb_rows_inserted= srv_n_rows_inserted;
+        export_vars.innodb_rows_updated= srv_n_rows_updated;
+        export_vars.innodb_rows_deleted= srv_n_rows_deleted;
+        mutex_exit(&srv_innodb_monitor_mutex);
+}
+
 /*************************************************************************
 A thread which wakes up threads whose lock wait may have lasted too long.
 This also prints the info output by various InnoDB monitors. */

mysql-test/r/innodb.result

@@ -1664,3 +1664,21 @@ select count(*) from t1 where x = 18446744073709551601;
 count(*)
 1
 drop table t1;
+show status like "Innodb_buffer_pool_pages_total";
+Variable_name	Value
+Innodb_buffer_pool_pages_total	512
+show status like "Innodb_page_size";
+Variable_name	Value
+Innodb_page_size	16384
+show status like "Innodb_rows_deleted";
+Variable_name	Value
+Innodb_rows_deleted	2078
+show status like "Innodb_rows_inserted";
+Variable_name	Value
+Innodb_rows_inserted	31706
+show status like "Innodb_rows_read";
+Variable_name	Value
+Innodb_rows_read	80161
+show status like "Innodb_rows_updated";
+Variable_name	Value
+Innodb_rows_updated	29530

mysql-test/t/innodb.test

@@ -1180,3 +1180,11 @@ select count(*) from t1 where x = 18446744073709551601;
 
 drop table t1;
 
+# Test for testable InnoDB status variables. This test
+# uses previous ones(pages_created, rows_deleted, ...).
+show status like "Innodb_buffer_pool_pages_total";
+show status like "Innodb_page_size";
+show status like "Innodb_rows_deleted";
+show status like "Innodb_rows_inserted";
+show status like "Innodb_rows_read";
+show status like "Innodb_rows_updated";

sql/ha_innodb.cc

@@ -149,6 +149,85 @@ static mysql_byte* innobase_get_key(INNOBASE_SHARE *share,uint *length,
 static INNOBASE_SHARE *get_share(const char *table_name);
 static void free_share(INNOBASE_SHARE *share);
 
+struct show_var_st innodb_status_variables[]= {
+  {"buffer_pool_pages_data",
+  (char*) &export_vars.innodb_buffer_pool_pages_data,     SHOW_LONG},
+  {"buffer_pool_pages_dirty",
+  (char*) &export_vars.innodb_buffer_pool_pages_dirty,    SHOW_LONG},
+  {"buffer_pool_pages_flushed",
+  (char*) &export_vars.innodb_buffer_pool_pages_flushed,  SHOW_LONG},
+  {"buffer_pool_pages_free",
+  (char*) &export_vars.innodb_buffer_pool_pages_free,     SHOW_LONG},
+  {"buffer_pool_pages_latched",
+  (char*) &export_vars.innodb_buffer_pool_pages_latched,  SHOW_LONG},
+  {"buffer_pool_pages_misc",
+  (char*) &export_vars.innodb_buffer_pool_pages_misc,     SHOW_LONG},
+  {"buffer_pool_pages_total",
+  (char*) &export_vars.innodb_buffer_pool_pages_total,    SHOW_LONG},
+  {"buffer_pool_read_ahead_rnd",
+  (char*) &export_vars.innodb_buffer_pool_read_ahead_rnd, SHOW_LONG},
+  {"buffer_pool_read_ahead_seq",
+  (char*) &export_vars.innodb_buffer_pool_read_ahead_seq, SHOW_LONG},
+  {"buffer_pool_read_requests",
+  (char*) &export_vars.innodb_buffer_pool_read_requests,  SHOW_LONG},
+  {"buffer_pool_reads",
+  (char*) &export_vars.innodb_buffer_pool_reads,          SHOW_LONG},
+  {"buffer_pool_wait_free",
+  (char*) &export_vars.innodb_buffer_pool_wait_free,      SHOW_LONG},
+  {"buffer_pool_write_requests",
+  (char*) &export_vars.innodb_buffer_pool_write_requests, SHOW_LONG},
+  {"data_fsyncs",
+  (char*) &export_vars.innodb_data_fsyncs,                SHOW_LONG},
+  {"data_pending_fsyncs",
+  (char*) &export_vars.innodb_data_pending_fsyncs,        SHOW_LONG},
+  {"data_pending_reads",
+  (char*) &export_vars.innodb_data_pending_reads,         SHOW_LONG},
+  {"data_pending_writes",
+  (char*) &export_vars.innodb_data_pending_writes,        SHOW_LONG},
+  {"data_read",
+  (char*) &export_vars.innodb_data_read,                  SHOW_LONG},
+  {"data_reads",
+  (char*) &export_vars.innodb_data_reads,                 SHOW_LONG},
+  {"data_writes",
+  (char*) &export_vars.innodb_data_writes,                SHOW_LONG},
+  {"data_written",
+  (char*) &export_vars.innodb_data_written,               SHOW_LONG},
+  {"dblwr_pages_written",
+  (char*) &export_vars.innodb_dblwr_pages_written,        SHOW_LONG},
+  {"dblwr_writes",
+  (char*) &export_vars.innodb_dblwr_writes,               SHOW_LONG},
+  {"log_waits",
+  (char*) &export_vars.innodb_log_waits,                  SHOW_LONG},
+  {"log_write_requests",
+  (char*) &export_vars.innodb_log_write_requests,         SHOW_LONG},
+  {"log_writes",
+  (char*) &export_vars.innodb_log_writes,                 SHOW_LONG},
+  {"os_log_fsyncs",
+  (char*) &export_vars.innodb_os_log_fsyncs,              SHOW_LONG},
+  {"os_log_pending_fsyncs",
+  (char*) &export_vars.innodb_os_log_pending_fsyncs,      SHOW_LONG},
+  {"os_log_pending_writes",
+  (char*) &export_vars.innodb_os_log_pending_writes,      SHOW_LONG},
+  {"os_log_written",
+  (char*) &export_vars.innodb_os_log_written,             SHOW_LONG},
+  {"page_size",
+  (char*) &export_vars.innodb_page_size,                  SHOW_LONG},
+  {"pages_created",
+  (char*) &export_vars.innodb_pages_created,              SHOW_LONG},
+  {"pages_read",
+  (char*) &export_vars.innodb_pages_read,                 SHOW_LONG},
+  {"pages_written",
+  (char*) &export_vars.innodb_pages_written,              SHOW_LONG},
+  {"rows_deleted",
+  (char*) &export_vars.innodb_rows_deleted,               SHOW_LONG},
+  {"rows_inserted",
+  (char*) &export_vars.innodb_rows_inserted,              SHOW_LONG},
+  {"rows_read",
+  (char*) &export_vars.innodb_rows_read,                  SHOW_LONG},
+  {"rows_updated",
+  (char*) &export_vars.innodb_rows_updated,               SHOW_LONG},
+  {NullS, NullS, SHOW_LONG}};
+
 /* General functions */
 
 /**********************************************************************
@@ -5120,6 +5199,17 @@ ha_innobase::external_lock(
 	DBUG_RETURN(0);
 }
 
+/****************************************************************************
+Here we export InnoDB status variables to MySQL.  */
+
+void
+innodb_export_status(void)
+/*======================*/
+{
+  srv_export_innodb_status();
+}
+
+
 /****************************************************************************
 Implements the SHOW INNODB STATUS command. Sends the output of the InnoDB
 Monitor to the client. */

sql/ha_innodb.h

@@ -176,6 +176,7 @@ class ha_innobase: public handler
         int cmp_ref(const byte *ref1, const byte *ref2);
 };
 
+extern struct show_var_st innodb_status_variables[];
 extern uint innobase_init_flags, innobase_lock_type;
 extern uint innobase_flush_log_at_trx_commit;
 extern ulong innobase_cache_size;
@@ -235,6 +236,7 @@ int innobase_savepoint(
 int innobase_close_connection(THD *thd);
 int innobase_drop_database(char *path);
 bool innodb_show_status(THD* thd);
+void innodb_export_status(void);
 
 my_bool innobase_query_caching_of_table_permitted(THD* thd, char* full_name,
 						uint full_name_len);

sql/handler.cc

@@ -468,6 +468,21 @@ int ha_release_temporary_latches(THD *thd)
   return 0;
 }
 
+
+/* 
+  Export statistics for different engines. Currently we use it only for
+  InnoDB.
+*/
+
+int ha_update_statistics()
+{
+#ifdef HAVE_INNOBASE_DB
+  if (opt_innodb)
+    innodb_export_status();
+#endif
+  return 0;
+}
+
 int ha_commit_trans(THD *thd, THD_TRANS* trans)
 {
   int error=0;

sql/handler.h

@@ -581,6 +581,7 @@ int ha_report_binlog_offset_and_commit(THD *thd, char *log_file_name,
 				       my_off_t end_offset);
 int ha_commit_complete(THD *thd);
 int ha_release_temporary_latches(THD *thd);
+int ha_update_statistics();
 int ha_commit_trans(THD *thd, THD_TRANS *trans);
 int ha_rollback_trans(THD *thd, THD_TRANS *trans);
 int ha_rollback_to_savepoint(THD *thd, char *savepoint_name);

sql/mysql_priv.h

@@ -991,7 +991,7 @@ extern ulong rpl_recovery_rank, thread_cache_size;
 extern ulong back_log;
 extern ulong specialflag, current_pid;
 extern ulong expire_logs_days, sync_binlog_period, sync_binlog_counter;
-extern my_bool relay_log_purge, opt_innodb_safe_binlog;
+extern my_bool relay_log_purge, opt_innodb_safe_binlog, opt_innodb;
 extern uint test_flags,select_errors,ha_open_options;
 extern uint protocol_version, mysqld_port, dropping_tables;
 extern uint delay_key_write_options, lower_case_table_names;

sql/mysqld.cc

@@ -5402,6 +5402,9 @@ struct show_var_st status_vars[]= {
    SHOW_LONG_STATUS},
   {"Handler_write",            (char*) offsetof(STATUS_VAR, ha_write_count),
    SHOW_LONG_STATUS},
+#ifdef HAVE_INNOBASE_DB
+  {"Innodb_",                  (char*) &innodb_status_variables, SHOW_VARS},
+#endif /*HAVE_INNOBASE_DB*/
   {"Key_blocks_not_flushed",   (char*) &dflt_key_cache_var.global_blocks_changed,
    SHOW_KEY_CACHE_LONG},
   {"Key_blocks_unused",        (char*) &dflt_key_cache_var.blocks_unused,

sql/structs.h

@@ -166,6 +166,7 @@ enum SHOW_TYPE
   SHOW_LONG, SHOW_LONGLONG, SHOW_INT, SHOW_CHAR, SHOW_CHAR_PTR, SHOW_DOUBLE,
   SHOW_BOOL, SHOW_MY_BOOL, SHOW_OPENTABLES, SHOW_STARTTIME, SHOW_QUESTION,
   SHOW_LONG_CONST, SHOW_INT_CONST, SHOW_HAVE, SHOW_SYS, SHOW_HA_ROWS,
+  SHOW_VARS,
 #ifdef HAVE_OPENSSL
   SHOW_SSL_CTX_SESS_ACCEPT, 	SHOW_SSL_CTX_SESS_ACCEPT_GOOD,
   SHOW_SSL_GET_VERSION, 	SHOW_SSL_CTX_GET_SESSION_CACHE_MODE,