mi_keycache.c:

  new file
Many files:
  Added CACHE INDEX command


sql/ha_myisam.cc:
  Added CACHE INDEX command
sql/handler.cc:
  Added CACHE INDEX command
sql/sql_lex.cc:
  Added CACHE INDEX command
sql/sql_parse.cc:
  Added CACHE INDEX command
sql/sql_table.cc:
  Added CACHE INDEX command
sql/ha_myisam.h:
  Added CACHE INDEX command
sql/handler.h:
  Added CACHE INDEX command
sql/mysql_priv.h:
  Added CACHE INDEX command
sql/sql_lex.h:
  Added CACHE INDEX command
sql/sql_yacc.yy:
  Added CACHE INDEX command

include/myisam.h

@@ -410,6 +410,8 @@ my_bool mi_test_if_sort_rep(MI_INFO *info, ha_rows rows, ulonglong key_map,
 int mi_init_bulk_insert(MI_INFO *info, ulong cache_size, ha_rows rows);
 void mi_flush_bulk_insert(MI_INFO *info, uint inx);
 void mi_end_bulk_insert(MI_INFO *info);
+int mi_assign_to_keycache(MI_INFO *info, ulonglong key_map,
+                          char *keycache_name);
 int mi_preload(MI_INFO *info, ulonglong key_map, my_bool ignore_leaves);
 
 #ifdef	__cplusplus

myisam/mi_keycache.c

+/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
+
+/*
+  Key cache assignments
+*/
+
+#include "myisamdef.h"
+
+
+/*
+  Assign pages of the index file for a table to a key cache
+
+  SYNOPSIS
+    mi_assign_to_keycache()
+      info          open table
+      map           map of indexes to assign to the key cache 
+      keycache_name name of of the key cache to assign index to
+
+  RETURN VALUE
+    0 if a success. error code - otherwise.
+
+  NOTES.
+    At present pages for all indexes must be assigned to the same key cache.
+    In future only pages for indexes specified in the key_map parameter
+    of the table will be assigned to the specified key cache.
+*/
+
+int mi_assign_to_keycache(MI_INFO *info, ulonglong key_map,
+                          char *keycache_name)
+{
+  return 0;
+}
+

sql/ha_myisam.cc

@@ -688,6 +688,64 @@ int ha_myisam::repair(THD *thd, MI_CHECK &param, bool optimize)
 }
 
 
+/*
+  Assign table indexes to a key cache.
+*/
+
+int ha_myisam::assign_to_keycache(THD* thd, HA_CHECK_OPT *check_opt)
+{
+  int error;
+  const char *errmsg;
+  ulonglong map= ~(ulonglong) 0;
+  TABLE_LIST *table_list= table->pos_in_table_list;
+  char *keycache_name= table_list->option;
+
+  DBUG_ENTER("ha_myisam::assign_to_keycache");
+
+  /* Check validity of the index references */ 
+  if (table_list->use_index)
+  {
+    key_map kmap= get_key_map_from_key_list(table, table_list->use_index);
+    if (kmap == ~(key_map) 0)
+    {
+      errmsg= thd->net.last_error;
+      error= HA_ADMIN_FAILED;
+      goto err;
+    }
+    if (kmap)
+      map= kmap;
+  }
+  
+  if ((error= mi_assign_to_keycache(file, map, keycache_name)))
+  {
+    switch (error) {
+    default: 
+      char buf[ERRMSGSIZE+20];
+      my_snprintf(buf, ERRMSGSIZE, 
+                  "Failed to read from index file (errno: %d)", my_errno);
+      errmsg= buf;
+    }
+    error= HA_ADMIN_FAILED;
+    goto err;
+  }
+  
+  DBUG_RETURN(HA_ADMIN_OK);
+
+ err:
+  {
+    MI_CHECK param;
+    myisamchk_init(&param);
+    param.thd= thd;
+    param.op_name= (char*)"assign_to_keycache";
+    param.db_name= table->table_cache_key;
+    param.table_name= table->table_name;
+    param.testflag= 0;
+    mi_check_print_error(&param, errmsg);
+    DBUG_RETURN(error);
+  }
+}
+
+
 /*
   Preload pages of the index file for a table into the key cache.
 */

sql/ha_myisam.h

@@ -127,6 +127,7 @@ class ha_myisam: public handler
   int optimize(THD* thd, HA_CHECK_OPT* check_opt);
   int restore(THD* thd, HA_CHECK_OPT* check_opt);
   int backup(THD* thd, HA_CHECK_OPT* check_opt);
+  int assign_to_keycache(THD* thd, HA_CHECK_OPT* check_opt);
   int preload_keys(THD* thd, HA_CHECK_OPT* check_opt);
 #ifdef HAVE_REPLICATION
   int dump(THD* thd, int fd);

sql/handler.cc

@@ -620,6 +620,11 @@ int handler::analyze(THD* thd, HA_CHECK_OPT* check_opt)
   return HA_ADMIN_NOT_IMPLEMENTED;
 }
 
+int handler::assign_to_keycache(THD* thd, HA_CHECK_OPT* check_opt)
+{
+  return HA_ADMIN_NOT_IMPLEMENTED;
+}
+
 int handler::preload_keys(THD* thd, HA_CHECK_OPT* check_opt)
 {
   return HA_ADMIN_NOT_IMPLEMENTED;

sql/handler.h

@@ -305,6 +305,7 @@ public:
   virtual int optimize(THD* thd,HA_CHECK_OPT* check_opt);
   virtual int analyze(THD* thd, HA_CHECK_OPT* check_opt);
   virtual int backup(THD* thd, HA_CHECK_OPT* check_opt);
+  virtual int assign_to_keycache(THD* thd, HA_CHECK_OPT* check_opt);
   virtual int preload_keys(THD* thd, HA_CHECK_OPT* check_opt);
   /*
     restore assumes .frm file must exist, and that generate_table() has been

sql/mysql_priv.h

@@ -403,6 +403,7 @@ int mysql_analyze_table(THD* thd, TABLE_LIST* table_list,
 			HA_CHECK_OPT* check_opt);
 int mysql_optimize_table(THD* thd, TABLE_LIST* table_list,
 			 HA_CHECK_OPT* check_opt);
+int mysql_assign_to_keycache(THD* thd, TABLE_LIST* table_list);
 int mysql_preload_keys(THD* thd, TABLE_LIST* table_list);
 
 bool check_simple_select();

sql/sql_lex.cc

@@ -1205,7 +1205,8 @@ TABLE_LIST *st_select_lex_node::add_table_to_list(THD *thd, Table_ident *table,
 						  ulong table_join_options,
 						  thr_lock_type flags,
 						  List<String> *use_index,
-						  List<String> *ignore_index)
+						  List<String> *ignore_index,
+                                                  LEX_STRING *option)
 {
   return 0;
 }

sql/sql_lex.h

@@ -59,7 +59,8 @@ enum enum_sql_command {
   SQLCOM_CHANGE_DB, SQLCOM_CREATE_DB, SQLCOM_DROP_DB, SQLCOM_ALTER_DB,
   SQLCOM_REPAIR, SQLCOM_REPLACE, SQLCOM_REPLACE_SELECT,
   SQLCOM_CREATE_FUNCTION, SQLCOM_DROP_FUNCTION,
-  SQLCOM_REVOKE,SQLCOM_OPTIMIZE, SQLCOM_CHECK, SQLCOM_PRELOAD_KEYS,
+  SQLCOM_REVOKE,SQLCOM_OPTIMIZE, SQLCOM_CHECK, 
+  SQLCOM_ASSIGN_TO_KEYCACHE, SQLCOM_PRELOAD_KEYS,
   SQLCOM_FLUSH, SQLCOM_KILL,  SQLCOM_ANALYZE,
   SQLCOM_ROLLBACK, SQLCOM_COMMIT, SQLCOM_SLAVE_START, SQLCOM_SLAVE_STOP,
   SQLCOM_BEGIN, SQLCOM_LOAD_MASTER_TABLE, SQLCOM_CHANGE_MASTER,
@@ -252,7 +253,8 @@ public:
 					ulong table_options,
 					thr_lock_type flags= TL_UNLOCK,
 					List<String> *use_index= 0,
-					List<String> *ignore_index= 0);
+					List<String> *ignore_index= 0,
+                                        LEX_STRING *option= 0);
   virtual void set_lock_for_tables(thr_lock_type lock_type) {}
   void mark_as_dependent(st_select_lex *last);
 
@@ -409,7 +411,8 @@ public:
 				ulong table_options,
 				thr_lock_type flags= TL_UNLOCK,
 				List<String> *use_index= 0,
-				List<String> *ignore_index= 0);
+				List<String> *ignore_index= 0,
+                                LEX_STRING *option= 0);
   void set_lock_for_tables(thr_lock_type lock_type);
   inline void init_order()
   {

sql/sql_parse.cc

@@ -1881,6 +1881,14 @@ mysql_execute_command(THD *thd)
     res = mysql_restore_table(thd, tables);
     break;
   }
+  case SQLCOM_ASSIGN_TO_KEYCACHE:
+  {
+    if (check_db_used(thd, tables) ||
+        check_access(thd, INDEX_ACL, tables->db, &tables->grant.privilege))
+      goto error; 
+    res = mysql_assign_to_keycache(thd, tables);
+    break;
+  }
   case SQLCOM_PRELOAD_KEYS:
   {
     if (check_db_used(thd, tables) ||
@@ -4063,7 +4071,8 @@ TABLE_LIST *st_select_lex::add_table_to_list(THD *thd,
 					     ulong table_options,
 					     thr_lock_type lock_type,
 					     List<String> *use_index,
-					     List<String> *ignore_index)
+					     List<String> *ignore_index,
+                                             LEX_STRING *option)
 {
   register TABLE_LIST *ptr;
   char *alias_str;
@@ -4124,7 +4133,7 @@ TABLE_LIST *st_select_lex::add_table_to_list(THD *thd,
   if (ignore_index)
     ptr->ignore_index=(List<String> *) thd->memdup((gptr) ignore_index,
 						   sizeof(*ignore_index));
-
+  ptr->option= option ? option->str : 0;
   /* check that used name is unique */
   if (lock_type != TL_IGNORE)
   {

sql/sql_table.cc

@@ -1560,6 +1560,27 @@ int mysql_optimize_table(THD* thd, TABLE_LIST* tables, HA_CHECK_OPT* check_opt)
 }
 
 
+/*
+  Assigned specified indexes for a table into key cache
+
+  SYNOPSIS
+    mysql_assign_to_keycache()
+    thd	        Thread object
+    tables      Table list (one table only)
+
+  RETURN VALUES
+    0	  ok
+   -1	  error
+*/
+
+int mysql_assign_to_keycache(THD* thd, TABLE_LIST* tables)
+{
+  DBUG_ENTER("mysql_assign_to_keycache");
+  DBUG_RETURN(mysql_admin_table(thd, tables, 0,
+				"assign_to_keycache", TL_WRITE, 0, 0, 0,
+				&handler::assign_to_keycache));
+}
+
 /*
   Preload specified indexes for a table into key cache
 

sql/sql_yacc.yy

@@ -657,11 +657,11 @@ bool my_yyoverflow(short **a, YYSTYPE **b,int *yystacksize);
 %type <NONE>
 	query verb_clause create change select do drop insert replace insert2
 	insert_values update delete truncate rename
-	show describe load alter optimize preload flush
+	show describe load alter optimize keycache preload flush
 	reset purge begin commit rollback slave master_def master_defs
 	repair restore backup analyze check start
 	field_list field_list_item field_spec kill column_def key_def
-	preload_list preload_keys
+	keycache_list assign_to_keycache preload_list preload_keys
 	select_item_list select_item values_list no_braces
 	opt_limit_clause delete_limit_clause fields opt_values values
 	procedure_list procedure_list2 procedure_item
@@ -730,6 +730,7 @@ verb_clause:
 	| lock
 	| kill
 	| optimize
+        | keycache
 	| preload
 	| purge
 	| rename
@@ -1843,6 +1844,34 @@ table_to_table:
 	    YYABORT;
 	};
 
+keycache:
+        CACHE_SYM INDEX 
+        {
+          LEX *lex=Lex;
+          lex->sql_command=SQLCOM_ASSIGN_TO_KEYCACHE;
+        }
+        keycache_list
+        {}
+        ;
+
+keycache_list:
+        assign_to_keycache
+        | keycache_list ',' assign_to_keycache;
+
+assign_to_keycache:
+        table_ident cache_keys_spec ident
+        {
+          LEX *lex=Lex;
+          SELECT_LEX *sel= &lex->select_lex;
+          if (!sel->add_table_to_list(lex->thd, $1, NULL, 0,
+                                      TL_WRITE,
+                                      sel->get_use_index(),
+                                      (List<String> *)0,
+                                      &($3)))        
+            YYABORT;
+        }
+        ;
+
 preload:
 	LOAD INDEX INTO CACHE_SYM
 	{
@@ -1858,7 +1887,7 @@ preload_list:
 	| preload_list ',' preload_keys;
 
 preload_keys:
-	table_ident preload_keys_spec opt_ignore_leaves
+	table_ident cache_keys_spec opt_ignore_leaves
 	{
 	  LEX *lex=Lex;
 	  SELECT_LEX *sel= &lex->select_lex;
@@ -1870,9 +1899,9 @@ preload_keys:
 	}
 	;
 
-preload_keys_spec:
+cache_keys_spec:
 	keys_or_index { Select->select_lex()->interval_list.empty(); }
-	preload_key_list_or_empty 
+	cache_key_list_or_empty 
 	{
 	  LEX *lex=Lex;
 	  SELECT_LEX *sel= &lex->select_lex;
@@ -1881,7 +1910,7 @@ preload_keys_spec:
 	}          
 	;
 
-preload_key_list_or_empty:
+cache_key_list_or_empty:
 	/* empty */
 	| '(' key_usage_list2 ')' {}
 	;