Merge (f2dee22a) · Commits · Software / OSDI20 Artifacts / mariadb

Docs/manual.texi

+24 −8

Original line number	Diff line number	Diff line
		@@ -19115,6 +19115,8 @@ 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
		@@ -19276,6 +19278,15 @@ 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
		@@ -24758,14 +24769,11 @@ 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
		@@ -31050,8 +31058,13 @@ 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:

		@@ -44082,6 +44095,9 @@ 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

+20 −0

Original line number	Diff line number	Diff line
		@@ -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

+2 −0

Original line number	Diff line number	Diff line
		@@ -113,6 +113,7 @@ 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},
		@@ -123,6 +124,7 @@ 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

+3 −1

Original line number	Diff line number	Diff line
		@@ -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

+1 −0

Original line number	Diff line number	Diff line
		@@ -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 };