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ALTER TABLE ... DISABLE KEYS / ALTER TABLE ... ENABLE KEYS

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Docs/manual.texi
View file @ 0edecec2
......@@ -19022,6 +19022,8 @@ alter_specification:
or DROP [COLUMN] col_name
or DROP PRIMARY KEY
or DROP INDEX index_name
or DISABLE KEYS
or ENABLE KEYS
or RENAME [TO] new_tbl_name
or ORDER BY col
or table_options
......@@ -19183,6 +19185,15 @@ If you use @code{ALTER TABLE} on a @code{MyISAM} table, all non-unique
indexes are created in a separate batch (like in @code{REPAIR}).
This should make @code{ALTER TABLE} much faster when you have many indexes.
@item
Since @strong{MySQL 4.0} this feature could be activated explicitly.
@code{ALTER TABLE ... DISABLE KEYS} makes @strong{MySQL} to stop updating
non-unique indexes for @code{MyISAM} table.
@code{ALTER TABLE ... ENABLE KEYS} then should be used to recreate missing
indexes. As @strong{MySQL} does it with special algorithm which is much
faster then inserting keys one by one, disabling keys could give a
considerable speedup on bulk inserts.
@item
@findex mysql_info()
With the C API function @code{mysql_info()}, you can find out how many
......@@ -24645,14 +24656,11 @@ InnoDB: Database physically writes the file full: wait...
InnoDB: Data file /home/heikki/data/ibdata2 did not exist: new to be created
InnoDB: Setting file /home/heikki/data/ibdata2 size to 262144000
InnoDB: Database physically writes the file full: wait...
InnoDB: Log file /home/heikki/data/logs/ib_logfile0 did not exist: new to be c
reated
InnoDB: Log file /home/heikki/data/logs/ib_logfile0 did not exist: new to be created
InnoDB: Setting log file /home/heikki/data/logs/ib_logfile0 size to 5242880
InnoDB: Log file /home/heikki/data/logs/ib_logfile1 did not exist: new to be c
reated
InnoDB: Log file /home/heikki/data/logs/ib_logfile1 did not exist: new to be created
InnoDB: Setting log file /home/heikki/data/logs/ib_logfile1 size to 5242880
InnoDB: Log file /home/heikki/data/logs/ib_logfile2 did not exist: new to be c
reated
InnoDB: Log file /home/heikki/data/logs/ib_logfile2 did not exist: new to be created
InnoDB: Setting log file /home/heikki/data/logs/ib_logfile2 size to 5242880
InnoDB: Started
mysqld: ready for connections
......@@ -30936,8 +30944,13 @@ Execute a @code{FLUSH TABLES} statement or the shell command @code{mysqladmin
flush-tables}.
@end enumerate
This procedure will be built into @code{LOAD DATA INFILE} in some future
version of @strong{MySQL}.
Since @strong{MySQL 4.0} you can also use
@code{ALTER TABLE tbl_name DISABLE KEYS} instead of
@code{myisamchk --keys-used=0 -rq /path/to/db/tbl_name} and
@code{ALTER TABLE tbl_name ENABLE KEYS} instead of
@code{myisamchk -r -q /path/to/db/tbl_name}. This way you can also skip
@code{FLUSH TABLES} steps.
@item
You can speed up insertions by locking your tables:
......@@ -43868,6 +43881,9 @@ Our TODO section contains what we plan to have in 4.0. @xref{TODO MySQL 4.0}.
@itemize @bullet
@item
Added @code{ALTER TABLE table_name DISABLE KEYS} and
@code{ALTER TABLE table_name ENABLE KEYS} commands.
@item
Added @code{HANDLER} command.
@item
Added @code{SQL_CALC_FOUND_ROWS} and @code{FOUND_ROWS()}. This make it
mysql-test/t/alter_table.test
View file @ 0edecec2
......@@ -71,3 +71,23 @@ ALTER TABLE t1 ADD Column new_col int not null;
UNLOCK TABLES;
OPTIMIZE TABLE t1;
DROP TABLE t1;
drop table if exists t1;
#
# ALTER TABLE ... ENABLE/DISABLE KEYS
create table t1 (n1 int not null, n2 int, n3 int, n4 float,
unique(n1),
key (n1, n2, n3, n4),
key (n2, n3, n4, n1),
key (n3, n4, n1, n2),
key (n4, n1, n2, n3) );
alter table t1 disable keys;
let $1=10000;
while ($1)
{
eval insert into t1 values($1,RAND()*1000,RAND()*1000,RAND());
dec $1;
}
alter table t1 enable keys;
drop table t1;
sql/lex.h
View file @ 0edecec2
......@@ -112,6 +112,7 @@ static SYMBOL symbols[] = {
{ "DELETE", SYM(DELETE_SYM),0,0},
{ "DESC", SYM(DESC),0,0},
{ "DESCRIBE", SYM(DESCRIBE),0,0},
{ "DISABLE", SYM(DISABLE_SYM),0,0},
{ "DISTINCT", SYM(DISTINCT),0,0},
{ "DISTINCTROW", SYM(DISTINCT),0,0}, /* Access likes this */
{ "DOUBLE", SYM(DOUBLE_SYM),0,0},
......@@ -122,6 +123,7 @@ static SYMBOL symbols[] = {
{ "ELSE", SYM(ELSE),0,0},
{ "ESCAPE", SYM(ESCAPE_SYM),0,0},
{ "ESCAPED", SYM(ESCAPED),0,0},
{ "ENABLE", SYM(ENABLE_SYM),0,0},
{ "ENCLOSED", SYM(ENCLOSED),0,0},
{ "ENUM", SYM(ENUM),0,0},
{ "EXPLAIN", SYM(DESCRIBE),0,0},
......
sql/mysql_priv.h
View file @ 0edecec2
......@@ -328,7 +328,9 @@ int mysql_alter_table(THD *thd, char *new_db, char *new_name,
List<Alter_column> &alter_list,
ORDER *order,
bool drop_primary,
enum enum_duplicates handle_duplicates);
enum enum_duplicates handle_duplicates,
enum enum_enable_or_disable keys_onoff=LEAVE_AS_IS,
bool simple_alter=0);
bool mysql_rename_table(enum db_type base,
const char *old_db,
const char * old_name,
......
sql/sql_class.h
View file @ 0edecec2
......@@ -24,6 +24,7 @@
class Query_log_event;
class Load_log_event;
enum enum_enable_or_disable { LEAVE_AS_IS, ENABLE, DISABLE };
enum enum_ha_read_modes { RFIRST, RNEXT, RPREV, RLAST, RKEY };
enum enum_duplicates { DUP_ERROR, DUP_REPLACE, DUP_IGNORE };
enum enum_log_type { LOG_CLOSED, LOG_NORMAL, LOG_NEW, LOG_BIN };
......
sql/sql_lex.h
View file @ 0edecec2
......@@ -144,10 +144,11 @@ typedef struct st_lex {
enum enum_tx_isolation tx_isolation;
enum enum_ha_read_modes ha_read_mode;
enum ha_rkey_function ha_rkey_mode;
enum enum_enable_or_disable alter_keys_onoff;
uint in_sum_expr,grant,grant_tot_col,which_columns, sort_default;
thr_lock_type lock_option;
bool create_refs,drop_primary,drop_if_exists,local_file;
bool in_comment,ignore_space,verbose;
bool in_comment,ignore_space,verbose,simple_alter;
} LEX;
......
sql/sql_parse.cc
View file @ 0edecec2
......@@ -1393,7 +1393,8 @@ mysql_execute_command(void)
tables, lex->create_list,
lex->key_list, lex->drop_list, lex->alter_list,
(ORDER *) lex->order_list.first,
lex->drop_primary, lex->duplicates);
lex->drop_primary, lex->duplicates,
lex->alter_keys_onoff, lex->simple_alter);
break;
}
#endif
......
sql/sql_table.cc
View file @ 0edecec2
......@@ -1080,7 +1080,9 @@ int mysql_alter_table(THD *thd,char *new_db, char *new_name,
List<Alter_column> &alter_list,
ORDER *order,
bool drop_primary,
enum enum_duplicates handle_duplicates)
enum enum_duplicates handle_duplicates,
enum enum_enable_or_disable keys_onoff,
bool simple_alter)
{
TABLE *table,*new_table;
int error;
......@@ -1145,14 +1147,13 @@ int mysql_alter_table(THD *thd,char *new_db, char *new_name,
if (create_info->row_type == ROW_TYPE_DEFAULT)
create_info->row_type=table->row_type;
/* Check if the user only wants to do a simple RENAME */
/* In some simple cases we need not to recreate the table */
thd->proc_info="setup";
if (new_name != table_name &&
!fields.elements && !keys.elements && ! drop_list.elements &&
!alter_list.elements && !drop_primary &&
new_db_type == old_db_type && create_info->max_rows == 0 &&
create_info->auto_increment_value == 0 && !table->tmp_table)
if (simple_alter)
{
error=0;
if (new_name != table_name)
{
thd->proc_info="rename";
VOID(pthread_mutex_lock(&LOCK_open));
......@@ -1178,6 +1179,18 @@ int mysql_alter_table(THD *thd,char *new_db, char *new_name,
VOID(pthread_cond_broadcast(&COND_refresh));
VOID(pthread_mutex_unlock(&LOCK_open));
}
if (!error)
{
switch (keys_onoff)
{
case LEAVE_AS_IS: break;
case ENABLE: error=table->file->activate_all_index(thd); break;
case DISABLE:
table->file->deactivate_non_unique_index(table->file->records);
break;
}
}
if (!error)
{
mysql_update_log.write(thd, thd->query, thd->query_length);
......@@ -1188,7 +1201,6 @@ int mysql_alter_table(THD *thd,char *new_db, char *new_name,
}
send_ok(&thd->net);
}
DBUG_RETURN(error);
}
......
sql/sql_yacc.yy
View file @ 0edecec2
......@@ -145,12 +145,14 @@ bool my_yyoverflow(short **a, YYSTYPE **b,int *yystacksize);
%token DESC
%token DESCRIBE
%token DISTINCT
%token DISABLE_SYM
%token DOUBLE_SYM
%token DROP
%token DUMPFILE
%token DYNAMIC_SYM
%token ELSE
%token ELT_FUNC
%token ENABLE_SYM
%token ENCLOSED
%token ENCODE_SYM
%token ENCRYPT
......@@ -1110,6 +1112,8 @@ alter:
lex->db=lex->name=0;
bzero((char*) &lex->create_info,sizeof(lex->create_info));
lex->create_info.db_type= DB_TYPE_DEFAULT;
lex->alter_keys_onoff=LEAVE_AS_IS;
lex->simple_alter=1;
}
alter_list
......@@ -1118,16 +1122,18 @@ alter_list:
| alter_list ',' alter_list_item
add_column:
ADD opt_column { Lex->change=0;}
ADD opt_column { Lex->change=0; }
alter_list_item:
add_column field_list_item opt_place
| add_column '(' field_list ')'
| CHANGE opt_column field_ident { Lex->change= $3.str; } field_spec
add_column field_list_item opt_place { Lex->simple_alter=0; }
| add_column '(' field_list ')' { Lex->simple_alter=0; }
| CHANGE opt_column field_ident { Lex->change= $3.str; Lex->simple_alter=0; }
field_spec
| MODIFY_SYM opt_column field_ident
{
Lex->length=Lex->dec=0; Lex->type=0; Lex->interval=0;
Lex->default_value=0;
Lex->simple_alter=0;
}
type opt_attribute
{
......@@ -1137,23 +1143,26 @@ alter_list_item:
Lex->default_value, $3.str,
Lex->interval))
YYABORT;
Lex->simple_alter=0;
}
| DROP opt_column field_ident opt_restrict
{ Lex->drop_list.push_back(new Alter_drop(Alter_drop::COLUMN,
$3.str)); }
| DROP PRIMARY_SYM KEY_SYM { Lex->drop_primary=1; }
| DROP FOREIGN KEY_SYM opt_ident {}
$3.str)); Lex->simple_alter=0; }
| DROP PRIMARY_SYM KEY_SYM { Lex->drop_primary=1; Lex->simple_alter=0; }
| DROP FOREIGN KEY_SYM opt_ident { Lex->simple_alter=0; }
| DROP key_or_index field_ident
{ Lex->drop_list.push_back(new Alter_drop(Alter_drop::KEY,
$3.str)); }
$3.str)); Lex->simple_alter=0; }
| DISABLE_SYM KEYS { Lex->alter_keys_onoff=DISABLE; }
| ENABLE_SYM KEYS { Lex->alter_keys_onoff=ENABLE; }
| ALTER opt_column field_ident SET DEFAULT literal
{ Lex->alter_list.push_back(new Alter_column($3.str,$6)); }
{ Lex->alter_list.push_back(new Alter_column($3.str,$6)); Lex->simple_alter=0; }
| ALTER opt_column field_ident DROP DEFAULT
{ Lex->alter_list.push_back(new Alter_column($3.str,(Item*) 0)); }
{ Lex->alter_list.push_back(new Alter_column($3.str,(Item*) 0)); Lex->simple_alter=0; }
| RENAME opt_to table_alias table_ident
{ Lex->db=$4->db.str ; Lex->name= $4->table.str; }
| create_table_options
| order_clause
{ Lex->db=$4->db.str ; Lex->name= $4->table.str; Lex->simple_alter=0; }
| create_table_options { Lex->simple_alter=0; }
| order_clause { Lex->simple_alter=0; }
opt_column:
/* empty */ {}
......@@ -2604,8 +2613,10 @@ keyword:
| DATE_SYM {}
| DAY_SYM {}
| DELAY_KEY_WRITE_SYM {}
| DISABLE_SYM {}
| DUMPFILE {}
| DYNAMIC_SYM {}
| ENABLE_SYM {}
| END {}
| ENUM {}
| ESCAPE_SYM {}
......
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