Many files:

  Fix bug #2167: generate foreign key id's locally for each table, in the form databasename/tablename_ibfk_number; if the user gives the constraint name explicitly remember it; these changes should ensure that foreign key id's in a slave are the same as in the master, and DROP FOREIGN KEY does not break replication
sync0sync.c:
  UNIV_SYNC_DEBUG caused assertion in the creation of the doublewrite buffer, if we do not allow thousands of latches per thread

innobase/dict/dict0crea.c

@@ -1171,23 +1171,36 @@ dict_create_or_check_foreign_constraint_tables(void)
 }
 
 /************************************************************************
-Adds foreign key definitions to data dictionary tables in the database. */
+Adds foreign key definitions to data dictionary tables in the database. We
+look at table->foreign_list, and also generate names to constraints that were
+not named by the user. A generated constraint has a name of the format
+databasename/tablename_ibfk_<number>, where the numbers start from 1, and are
+given locally for this table, that is, the number is not global, as in the
+old format constraints < 4.0.18 it used to be. */
 
 ulint
 dict_create_add_foreigns_to_dictionary(
 /*===================================*/
 				/* out: error code or DB_SUCCESS */
+	ulint		start_id,/* in: if we are actually doing ALTER TABLE
+				ADD CONSTRAINT, we want to generate constraint
+				numbers which are bigger than in the table so
+				far; we number the constraints from
+				start_id + 1 up; start_id should be set to 0 if
+				we are creating a new table, or if the table
+				so far has no constraints for which the name
+				was generated here */
 	dict_table_t*	table,	/* in: table */
 	trx_t*		trx)	/* in: transaction */
 {
 	dict_foreign_t*	foreign;
 	que_thr_t*	thr;
 	que_t*		graph;
-	dulint		id;	
+	ulint		number	= start_id + 1;
 	ulint		len;
 	ulint		error;
+	char*		ebuf	= dict_foreign_err_buf;
 	ulint		i;
-	char		buf2[50];
 	char		buf[10000];
 
 	ut_ad(mutex_own(&(dict_sys->mutex)));	
@@ -1215,18 +1228,18 @@ dict_create_add_foreigns_to_dictionary(
 	"PROCEDURE ADD_FOREIGN_DEFS_PROC () IS\n"
 	"BEGIN\n");
 
-	/* We allocate the new id from the sequence of table id's */
-	id = dict_hdr_get_new_id(DICT_HDR_TABLE_ID);
-
-	sprintf(buf2, "%lu_%lu", ut_dulint_get_high(id),
-						ut_dulint_get_low(id));
-	foreign->id = mem_heap_alloc(foreign->heap, ut_strlen(buf2) + 1);
-	ut_memcpy(foreign->id, buf2, ut_strlen(buf2) + 1);
+	if (foreign->id == NULL) {
+		/* Generate a new constraint id */
+		foreign->id = mem_heap_alloc(foreign->heap,
+						ut_strlen(table->name)
+						+ 20);
+		sprintf(foreign->id, "%s_ibfk_%lu", table->name, number);
+		number++;
+	}
 
 	len += sprintf(buf + len,
-	"INSERT INTO SYS_FOREIGN VALUES('%lu_%lu', '%s', '%s', %lu);\n",
-					ut_dulint_get_high(id),
-					ut_dulint_get_low(id),
+	"INSERT INTO SYS_FOREIGN VALUES('%s', '%s', '%s', %lu);\n",
+					foreign->id,
 					table->name,
 					foreign->referenced_table_name,
 					foreign->n_fields
@@ -1235,9 +1248,8 @@ dict_create_add_foreigns_to_dictionary(
 	for (i = 0; i < foreign->n_fields; i++) {
 
 		len += sprintf(buf + len,
-	"INSERT INTO SYS_FOREIGN_COLS VALUES('%lu_%lu', %lu, '%s', '%s');\n",
-					ut_dulint_get_high(id),
-					ut_dulint_get_low(id),
+	"INSERT INTO SYS_FOREIGN_COLS VALUES('%s', %lu, '%s', '%s');\n",
+					foreign->id,
 					i,
 					foreign->foreign_col_names[i],
 					foreign->referenced_col_names[i]);
@@ -1262,29 +1274,30 @@ dict_create_add_foreigns_to_dictionary(
 
 	que_graph_free(graph);
 
-	if (error != DB_SUCCESS) {
-	        fprintf(stderr,
-			"InnoDB: Foreign key constraint creation failed:\n"
-			"InnoDB: internal error number %lu\n", error);
-
 	if (error == DB_DUPLICATE_KEY) {
-			fprintf(stderr,
-	"InnoDB: Duplicate key error in system table %s index %s\n",
-			((dict_index_t*)trx->error_info)->table_name,
-			((dict_index_t*)trx->error_info)->name);
+		mutex_enter(&dict_foreign_err_mutex);
+		ut_sprintf_timestamp(dict_foreign_err_buf);
+		sprintf(ebuf + strlen(ebuf),
+" Error in foreign key constraint creation for table %.500s.\n"
+"A foreign key constraint of name %.500s\n"
+"already exists (note that internally InnoDB adds 'databasename/'\n"
+"in front of the user-defined constraint name).\n", table->name, foreign->id);
 
-			fprintf(stderr, "%s\n", buf);
+		ut_a(strlen(ebuf) < DICT_FOREIGN_ERR_BUF_LEN);
 
-			fprintf(stderr,
-	"InnoDB: Maybe the internal data dictionary of InnoDB is\n"
-	"InnoDB: out-of-sync from the .frm files of your tables.\n"
-	"InnoDB: See section 15.1 Troubleshooting data dictionary operations\n"
-	"InnoDB: at http://www.innodb.com/ibman.html\n");
+		mutex_exit(&dict_foreign_err_mutex);
+
+		return(error);
 	}
 
+	if (error != DB_SUCCESS) {
+	        fprintf(stderr,
+			"InnoDB: Foreign key constraint creation failed:\n"
+			"InnoDB: internal error number %lu\n", error);
+
 		mutex_enter(&dict_foreign_err_mutex);
-		ut_sprintf_timestamp(buf);
-		sprintf(buf + strlen(buf),
+		ut_sprintf_timestamp(ebuf);
+		sprintf(ebuf + strlen(ebuf),
 " Internal error in foreign key constraint creation for table %.500s.\n"
 "See the MySQL .err log in the datadir for more information.\n", table->name);
 		mutex_exit(&dict_foreign_err_mutex);

innobase/dict/dict0dict.c

@@ -236,6 +236,29 @@ dict_remove_db_name(
 	return(NULL);
 }
 
+/************************************************************************
+Get the database name length in a table name. */
+
+ulint
+dict_get_db_name_len(
+/*=================*/
+			/* out: database name length */
+	char*	name)	/* in: table name in the form dbname '/' tablename */
+{
+	ulint	i;
+
+	for (i = 0; i < 100000 ; i++) {
+		if (name[i] == '/') {
+
+			return(i);
+		}
+	}
+
+	ut_a(0);
+
+	return(0);
+}
+	
 /************************************************************************
 Reserves the dictionary system mutex for MySQL. */
 
@@ -869,6 +892,7 @@ dict_table_rename_in_cache(
 	ulint		fold;
 	ulint		old_size;
 	char*		name_buf;
+	char*		old_name;
 	ulint		i;
 	
 	ut_ad(table);
@@ -899,6 +923,9 @@ dict_table_rename_in_cache(
 	/* Remove table from the hash tables of tables */
 	HASH_DELETE(dict_table_t, name_hash, dict_sys->table_hash,
 					ut_fold_string(table->name), table);
+	old_name = mem_heap_alloc(table->heap, ut_strlen(table->name) + 1);
+	
+	ut_strcpy(old_name, table->name);
 
 	name_buf = mem_heap_alloc(table->heap, ut_strlen(new_name) + 1);
 					
@@ -956,7 +983,9 @@ dict_table_rename_in_cache(
 		return(TRUE);
 	}
 
-	/* Update the table name fields in foreign constraints */
+	/* Update the table name fields in foreign constraints, and update also
+	the constraint id of new format >= 4.0.18 constraints. Note that at
+	this point we have already changed table->name to the new name. */
 
 	foreign = UT_LIST_GET_FIRST(table->foreign_list);
 
@@ -965,14 +994,68 @@ dict_table_rename_in_cache(
 						ut_strlen(table->name)) {
 			/* Allocate a longer name buffer;
 			TODO: store buf len to save memory */
+
 			foreign->foreign_table_name = mem_heap_alloc(
 					foreign->heap,
 					ut_strlen(table->name) + 1);
 		}
 
-		ut_memcpy(foreign->foreign_table_name, table->name,
-						ut_strlen(table->name) + 1);
-		foreign->foreign_table_name[ut_strlen(table->name)] = '\0';
+		sprintf(foreign->foreign_table_name, "%s", table->name);
+
+		if (ut_str_contains(foreign->id, '/')) {
+			ulint	db_len;
+			char	old_id[2000];
+
+			/* This is a >= 4.0.18 format id */
+
+			ut_a(ut_strlen(foreign->id) < 1999);
+
+			ut_strcpy(old_id, foreign->id);
+
+			if (ut_strlen(foreign->id) > ut_strlen(old_name)
+						+ ut_strlen("_ibfk_")
+			    && 0 == ut_memcmp(foreign->id, old_name,
+						ut_strlen(old_name))
+			    && 0 == ut_memcmp(
+					foreign->id + ut_strlen(old_name),
+				    (char*)"_ibfk_", ut_strlen("_ibfk_"))) {
+
+				/* This is a generated >= 4.0.18 format id */
+
+				if (ut_strlen(table->name) 
+				    > ut_strlen(old_name)) {
+					foreign->id = mem_heap_alloc(
+					     foreign->heap,
+						ut_strlen(table->name)
+						+ ut_strlen(old_id) + 1);
+				}
+				
+				/* Replace the prefix 'databasename/tablename'
+				with the new names */
+				sprintf(foreign->id, "%s%s", table->name,
+						old_id + ut_strlen(old_name));
+			} else {
+				/* This is a >= 4.0.18 format id where the user
+				gave the id name */
+				db_len = dict_get_db_name_len(table->name) + 1;
+
+				if (dict_get_db_name_len(table->name)
+			    	    > dict_get_db_name_len(foreign->id)) {
+
+					foreign->id = mem_heap_alloc(
+					     foreign->heap,
+				 	     db_len + ut_strlen(old_id) + 1);
+				}
+
+				/* Replace the database prefix in id with the
+				one from table->name */
+			
+				ut_memcpy(foreign->id, table->name, db_len);
+
+				sprintf(foreign->id + db_len, "%s",
+						dict_remove_db_name(old_id));
+			}
+		}
 
 		foreign = UT_LIST_GET_NEXT(foreign_list, foreign);
 	}
@@ -984,14 +1067,13 @@ dict_table_rename_in_cache(
 						ut_strlen(table->name)) {
 			/* Allocate a longer name buffer;
 			TODO: store buf len to save memory */
+
 			foreign->referenced_table_name = mem_heap_alloc(
 					foreign->heap,
 					ut_strlen(table->name) + 1);
 		}
 
-		ut_memcpy(foreign->referenced_table_name, table->name,
-						ut_strlen(table->name) + 1);
-		foreign->referenced_table_name[ut_strlen(table->name)] = '\0';
+		sprintf(foreign->referenced_table_name, "%s", table->name);
 
 		foreign = UT_LIST_GET_NEXT(referenced_list, foreign);
 	}
@@ -2042,7 +2124,7 @@ static
 char*
 dict_scan_to(
 /*=========*/
-			
+				/* out: scanned up to this */
 	char*	ptr,		/* in: scan from */
 	const char *string)	/* in: look for this */
 {
@@ -2299,12 +2381,7 @@ dict_scan_table_name(
 
 		database_name = name;
 			
-		i = 0;
-		while (name[i] != '/') {
-			i++;
-		}
-
-		database_name_len = i;
+		database_name_len = dict_get_db_name_len(name);
 	}
 
 	if (table_name_len + database_name_len > 2000) {
@@ -2478,6 +2555,52 @@ dict_strip_comments(
 	}
 }
 
+/*************************************************************************
+Finds the highest <number> for foreign key constraints of the table. Looks
+only at the >= 4.0.18-format id's, which are of the form
+databasename/tablename_ibfk_<number>. */
+static
+ulint
+dict_table_get_highest_foreign_id(
+/*==============================*/
+				/* out: highest number, 0 if table has no new
+				format foreign key constraints */
+	dict_table_t*	table)	/* in: table in the dictionary memory cache */
+{
+	dict_foreign_t*	foreign;
+	char*		endp;
+	ulint		biggest_id	= 0;
+	ulint		id;
+
+	ut_a(table);
+
+	foreign = UT_LIST_GET_FIRST(table->foreign_list);
+
+	while (foreign) {
+		if (ut_strlen(foreign->id) > ut_strlen("_ibfk_")
+						+ ut_strlen(table->name)
+		    && 0 == ut_memcmp(foreign->id, table->name,
+							ut_strlen(table->name))
+		    && 0 == ut_memcmp(foreign->id + ut_strlen(table->name),
+				      (char*)"_ibfk_", ut_strlen("_ibfk_"))) {
+			/* It is of the >= 4.0.18 format */
+
+			id = strtoul(foreign->id + ut_strlen(table->name)
+						 + ut_strlen("_ibfk_"),
+					&endp, 10);
+			ut_a(id != biggest_id);
+
+			if (id > biggest_id) {
+				biggest_id = id;
+			}
+		}
+
+		foreign = UT_LIST_GET_NEXT(foreign_list, foreign);
+	}
+
+	return(biggest_id);
+}
+
 /*************************************************************************
 Reports a simple foreign key create clause syntax error. */
 static
@@ -2520,19 +2643,26 @@ dict_create_foreign_constraints_low(
 				FOREIGN KEY (a, b) REFERENCES table2(c, d),
 				table2 can be written also with the database
 				name before it: test.table2; the default
-				database id the database of parameter name */
+				database is the database of parameter name */
 	char*	name)		/* in: table full name in the normalized form
 				database_name/table_name */
 {
 	dict_table_t*	table;
 	dict_table_t*	referenced_table;
+	dict_table_t*	table_to_alter;
+	ulint		highest_id_so_far	= 0;
 	dict_index_t*	index;
 	dict_foreign_t*	foreign;
  	char*		ptr			= sql_string;
 	char*		start_of_latest_foreign	= sql_string;
  	char*		buf			= dict_foreign_err_buf;
+	char*		constraint_name;	/* this is NOT a null-
+						terminated string */
+	ulint		constraint_name_len;
 	ibool		success;
 	ulint		error;
+	char*		ptr1;
+	char*		ptr2;
 	ulint		i;
 	ulint		j;
 	ibool		is_on_delete;
@@ -2559,16 +2689,89 @@ dict_create_foreign_constraints_low(
 
 		return(DB_ERROR);
 	}
+
+	/* First check if we are actually doing an ALTER TABLE, and in that
+	case look for the table being altered */
+
+	ptr = dict_accept(ptr, (char*) "ALTER", &success);
+
+	if (!success) {
+
+		goto loop;
+	}
+
+	ptr = dict_accept(ptr, (char*) "TABLE", &success);
+
+	if (!success) {
+
+		goto loop;
+	}
+
+	/* We are doing an ALTER TABLE: scan the table name we are altering;
+	in the call below we use the buffer 'referenced_table_name' as a dummy
+	buffer */
+
+	ptr = dict_scan_table_name(ptr, &table_to_alter, name,
+					&success, referenced_table_name);
+	if (!success) {
+		fprintf(stderr,
+"InnoDB: Error: could not find the table being ALTERED in:\n%s\n", sql_string);
+
+		return(DB_ERROR);
+	}
+
+	/* Starting from 4.0.18 and 4.1.2, we generate foreign key id's in the
+	format databasename/tablename_ibfk_<number>, where <number> is local
+	to the table; look for the highest <number> for table_to_alter, so
+	that we can assign to new constraints higher numbers. */
+
+	/* If we are altering a temporary table, the table name after ALTER
+	TABLE does not correspond to the internal table name, and
+	table_to_alter is NULL. TODO: should we fix this somehow? */
+
+	if (table_to_alter == NULL) {
+		highest_id_so_far = 0;
+	} else {
+		highest_id_so_far = dict_table_get_highest_foreign_id(
+							table_to_alter);
+	}
+
+	/* Scan for foreign key declarations in a loop */
 loop:
-	ptr = dict_scan_to(ptr, (char *) "FOREIGN");
+	/* Scan either to "CONSTRAINT" or "FOREIGN", whichever is closer */
 
-	if (*ptr == '\0') {
+	ptr1 = dict_scan_to(ptr, (char *) "CONSTRAINT");
+	ptr2 = dict_scan_to(ptr, (char *) "FOREIGN");
+
+	constraint_name = NULL;
+
+	if (ptr1 < ptr2) {
+		/* The user has specified a constraint name. Pick it so
+		that we can store 'databasename/constraintname' as the id of
+		the id of the constraint to system tables. */
+		ptr = ptr1;
+
+		ptr = dict_accept(ptr, (char *) "CONSTRAINT", &success);
+
+		ut_a(success);
+
+		if (!isspace(*ptr)) {
+	        	goto loop;
+		}
+
+		ptr = dict_scan_id(ptr, &constraint_name, &constraint_name_len,
+									FALSE);
+	} else {
+		ptr = ptr2;
+	}
 
+	if (*ptr == '\0') {
+		/**********************************************************/
 		/* The following call adds the foreign key constraints
 		to the data dictionary system tables on disk */
 		
-		error = dict_create_add_foreigns_to_dictionary(table, trx);
-
+		error = dict_create_add_foreigns_to_dictionary(
+						highest_id_so_far, table, trx);
 		return(error);
 	}
 
@@ -2676,6 +2879,28 @@ dict_create_foreign_constraints_low(
 
 	foreign = dict_mem_foreign_create();
 
+	if (constraint_name) {
+		ulint	db_len;	
+
+		/* Catenate 'databasename/' to the constraint name specified
+		by the user: we conceive the constraint as belonging to the
+		same MySQL 'database' as the table itself. We store the name
+		to foreign->id. */
+
+		db_len = dict_get_db_name_len(table->name);
+
+		foreign->id = mem_heap_alloc(foreign->heap,
+				db_len + 1 + constraint_name_len + 1);
+		
+		ut_memcpy(foreign->id, table->name, db_len);
+
+		foreign->id[db_len] = '/';
+
+		ut_memcpy(foreign->id + db_len + 1, constraint_name,
+							constraint_name_len);
+		foreign->id[db_len + 1 + constraint_name_len] = '\0';
+	}
+
 	foreign->foreign_table = table;
 	foreign->foreign_table_name = table->name;
 	foreign->foreign_index = index;
@@ -2977,7 +3202,7 @@ dict_create_foreign_constraints(
 				FOREIGN KEY (a, b) REFERENCES table2(c, d),
 				table2 can be written also with the database
 				name before it: test.table2; the default
-				database id the database of parameter name */
+				database is the database of parameter name */
 	char*	name)		/* in: table full name in the normalized form
 				database_name/table_name */
 {
@@ -3079,8 +3304,10 @@ dict_foreign_parse_drop_constraints(
 	foreign = UT_LIST_GET_FIRST(table->foreign_list);
 
 	while (foreign != NULL) {
-		if (0 == ut_strcmp(foreign->id, id)) {
-
+		if (0 == ut_strcmp(foreign->id, id)
+		    || (ut_str_contains(foreign->id, '/')
+			&& 0 == ut_strcmp(id,
+					dict_remove_db_name(foreign->id)))) {
 			/* Found */
 			break;
 		}
@@ -3093,8 +3320,8 @@ dict_foreign_parse_drop_constraints(
 		ut_sprintf_timestamp(buf);
 		sprintf(buf + strlen(buf),
 " Error in dropping of a foreign key constraint of table %.500s,\n"
-"just before:\n%s\n in SQL command\n%s\nCannot find a constraint with the\n"
-"given id %s.\n", table->name, ptr, str, id);
+"in SQL command\n%s\nCannot find a constraint with the\n"
+"given id %s.\n", table->name, str, id);
 		ut_a(strlen(buf) < DICT_FOREIGN_ERR_BUF_LEN);
 		mutex_exit(&dict_foreign_err_mutex);
 
@@ -3896,11 +4123,20 @@ dict_print_info_on_foreign_key_in_create_format(
 	char*		buf)	/* in: buffer of at least 5000 bytes */
 {
 	char*	buf2	= buf;
+	char*	stripped_id;
 	ulint	cpy_len;
 	ulint	i;
 	
+	if (ut_str_contains(foreign->id, '/')) {
+		/* Strip the preceding database name from the constraint id */
+		stripped_id = foreign->id + 1
+				+ dict_get_db_name_len(foreign->id);
+	} else {
+		stripped_id = foreign->id;
+	}
+
 	buf2 += sprintf(buf2, ",\n  CONSTRAINT `%s` FOREIGN KEY (",
-							foreign->id);
+								stripped_id);
 	for (i = 0; i < foreign->n_fields; i++) {
 	        if ((ulint)(buf2 - buf) >= 4000) {
 

innobase/include/dict0crea.h

@@ -81,12 +81,25 @@ dict_create_or_check_foreign_constraint_tables(void);
 /*================================================*/
 				/* out: DB_SUCCESS or error code */
 /************************************************************************
-Adds foreign key definitions to data dictionary tables in the database. */
+Adds foreign key definitions to data dictionary tables in the database. We
+look at table->foreign_list, and also generate names to constraints that were
+not named by the user. A generated constraint has a name of the format
+databasename/tablename_ibfk_<number>, where the numbers start from 1, and are
+given locally for this table, that is, the number is not global, as in the
+old format constraints < 4.0.18 it used to be. */
 
 ulint
 dict_create_add_foreigns_to_dictionary(
 /*===================================*/
 				/* out: error code or DB_SUCCESS */
+	ulint		start_id,/* in: if we are actually doing ALTER TABLE
+				ADD CONSTRAINT, we want to generate constraint
+				numbers which are bigger than in the table so
+				far; we number the constraints from
+				start_id + 1 up; start_id should be set to 0 if
+				we are creating a new table, or if the table
+				so far has no constraints for which the name
+				was generated here */
 	dict_table_t*	table,	/* in: table */
 	trx_t*		trx);	/* in: transaction */
 

innobase/include/dict0dict.h

@@ -26,6 +26,14 @@ Created 1/8/1996 Heikki Tuuri
 #include "ut0byte.h"
 #include "trx0types.h"
 
+/************************************************************************
+Get the database name length in a table name. */
+
+ulint
+dict_get_db_name_len(
+/*=================*/
+			/* out: database name length */
+	char*	name);	/* in: table name in the form dbname '/' tablename */
 /*************************************************************************
 Accepts a specified string. Comparisons are case-insensitive. */
 

innobase/include/ut0mem.h

@@ -85,10 +85,17 @@ ut_str_catenate(
 			/* out, own: catenated null-terminated string */
 	char*	str1,	/* in: null-terminated string */
 	char*	str2);	/* in: null-terminated string */
+/**************************************************************************
+Checks if a null-terminated string contains a certain character. */
+
+ibool
+ut_str_contains(
+/*============*/
+	char*	str,	/* in: null-terminated string */
+	char	c);	/* in: character */
 
 #ifndef UNIV_NONINL
 #include "ut0mem.ic"
 #endif
 
 #endif
-

innobase/row/row0mysql.c

@@ -2221,6 +2221,7 @@ row_rename_table_for_mysql(
         ulint           keywordlen;
 	ulint		len;
 	ulint		i;
+	char*		db_name;
 	char		buf[10000];
 
 	ut_ad(trx->mysql_thread_id == os_thread_get_curr_id());
@@ -2285,6 +2286,15 @@ row_rename_table_for_mysql(
 	"PROCEDURE RENAME_TABLE_PROC () IS\n"
 	"new_table_name CHAR;\n"
 	"old_table_name CHAR;\n"
+	"gen_constr_prefix CHAR;\n"
+	"new_db_name CHAR;\n"
+	"foreign_id CHAR;\n"
+	"new_foreign_id CHAR;\n"
+	"old_db_name_len INT;\n"
+	"old_t_name_len INT;\n"
+	"new_db_name_len INT;\n"
+	"id_len INT;\n"
+	"found INT;\n"
 	"BEGIN\n"
 	"new_table_name :='";
 
@@ -2311,32 +2321,94 @@ row_rename_table_for_mysql(
 		}
 		
 		str3 = mem_heap_alloc(heap,
-					1000 + 500 * n_constraints_to_drop);
+					1000 + 1000 * n_constraints_to_drop);
 		*str3 = '\0';
 		sprintf(str3,
 			"';\n"
 			"UPDATE SYS_TABLES SET NAME = new_table_name\n"
 			"WHERE NAME = old_table_name;\n");
 
+		db_name = mem_heap_alloc(heap, 1 + dict_get_db_name_len(
+								old_name));
+		ut_memcpy(db_name, old_name, dict_get_db_name_len(old_name));
+		db_name[dict_get_db_name_len(old_name)] = '\0';
+
+		/* Internally, old format < 4.0.18 constraints have as the
+		constraint id <number>_<number>, while new format constraints
+		have <databasename>/<constraintname>. */
+
 		for (i = 0; i < n_constraints_to_drop; i++) {
+
+			sprintf(str3 + strlen(str3),
+			"DELETE FROM SYS_FOREIGN_COLS WHERE ID = '%s/%s';\n"
+			"DELETE FROM SYS_FOREIGN WHERE ID = '%s/%s';\n",
+				db_name, constraints_to_drop[i],
+				db_name, constraints_to_drop[i]);
+
+			if (!ut_str_contains(constraints_to_drop[i], '/')) {
+				/* If this happens to be an old format
+				constraint, let us delete it. Since all new
+				format constraints contain '/', it does no
+				harm to run these DELETEs anyway. */
+
 				sprintf(str3 + strlen(str3),
 			     "DELETE FROM SYS_FOREIGN_COLS WHERE ID = '%s';\n"
 			     "DELETE FROM SYS_FOREIGN WHERE ID = '%s';\n",
 				constraints_to_drop[i],
 				constraints_to_drop[i]);
 			}
+		}
 
 		sprintf(str3 + strlen(str3),
 			"END;\n");
 
-		ut_a(strlen(str3) < 1000 + 500 * n_constraints_to_drop);
+		ut_a(strlen(str3) < 1000 + 1000 * n_constraints_to_drop);
 	} else {
 		str3 = (char*)
 		"';\n"
 		"UPDATE SYS_TABLES SET NAME = new_table_name\n"
 		"WHERE NAME = old_table_name;\n"
-		"UPDATE SYS_FOREIGN SET FOR_NAME = new_table_name\n"
-		"WHERE FOR_NAME = old_table_name;\n"
+		"found := 1;\n"
+		"old_db_name_len := INSTR(old_table_name, '/') - 1;\n"
+		"new_db_name_len := INSTR(new_table_name, '/') - 1;\n"
+		"new_db_name := SUBSTR(new_table_name, 0, new_db_name_len);\n"
+		"old_t_name_len := LENGTH(old_table_name);\n"
+		"gen_constr_prefix := CONCAT(old_table_name, '_ibfk_');\n"
+		"WHILE found = 1 LOOP\n"
+		"	SELECT ID INTO foreign_id\n"
+		"	FROM SYS_FOREIGN\n"
+		"	WHERE FOR_NAME = old_table_name;\n"	
+		"	IF (SQL % NOTFOUND) THEN\n"
+		"	 found := 0;\n"
+		"	ELSE\n"
+		"	 UPDATE SYS_FOREIGN\n"
+		"	 SET FOR_NAME = new_table_name\n"
+		"	 WHERE ID = foreign_id;\n"
+		"	 id_len := LENGTH(foreign_id);\n"
+		"	 IF (INSTR(foreign_id, '/') > 0) THEN\n"
+		"	 	IF (INSTR(foreign_id,\n"
+		"				gen_constr_prefix) > 0)\n"
+		"		THEN\n"
+		"		  new_foreign_id :=\n"
+		"		    CONCAT(new_table_name,\n"
+		"			SUBSTR(foreign_id, old_t_name_len,\n"
+		"			      	 id_len - old_t_name_len));\n"
+		"		ELSE\n"
+		"		  new_foreign_id :=\n"
+		"		    CONCAT(new_db_name,\n"
+		"			SUBSTR(foreign_id,\n"
+		"				old_db_name_len,\n"
+		"				 id_len - old_db_name_len));\n"
+		"		END IF;\n"
+		"		UPDATE SYS_FOREIGN\n"
+		"		SET ID = new_foreign_id\n"
+		"		WHERE ID = foreign_id;\n"
+		"		UPDATE SYS_FOREIGN_COLS\n"
+		"		SET ID = new_foreign_id\n"
+		"		WHERE ID = foreign_id;\n"
+		"	 END IF;\n"
+		"	END IF;\n"
+		"END LOOP;\n"
 		"UPDATE SYS_FOREIGN SET REF_NAME = new_table_name\n"
 		"WHERE REF_NAME = old_table_name;\n"
 		"END;\n";

innobase/sync/sync0sync.c

@@ -159,7 +159,7 @@ struct sync_thread_struct{
 };
 
 /* Number of slots reserved for each OS thread in the sync level array */
-#define SYNC_THREAD_N_LEVELS	250
+#define SYNC_THREAD_N_LEVELS	10000
 
 struct sync_level_struct{
 	void*	latch;	/* pointer to a mutex or an rw-lock; NULL means that

innobase/ut/ut0mem.c

@@ -221,3 +221,27 @@ ut_str_catenate(
 
 	return(str);
 }
+
+/**************************************************************************
+Checks if a null-terminated string contains a certain character. */
+
+ibool
+ut_str_contains(
+/*============*/
+	char*	str,	/* in: null-terminated string */
+	char	c)	/* in: character */
+{
+	ulint	len;
+	ulint	i;
+
+	len = ut_strlen(str);
+
+	for (i = 0; i < len; i++) {
+		if (str[i] == c) {
+
+			return(TRUE);
+		}
+	}
+
+	return(FALSE);
+}
\ No newline at end of file