REPAIR ... USE_FRM (d714ba23) · Commits · Software / OSDI20 Artifacts / mariadb

Docs/manual.texi

+10 −1

Original line number	Diff line number	Diff line
		@@ -17687,7 +17687,7 @@ to set the column to some other value than 0.
		@findex REPAIR TABLE

		@example
		REPAIR TABLE tbl_name[,tbl_name...] [QUICK] [EXTENDED]
		REPAIR TABLE tbl_name[,tbl_name...] [QUICK] [EXTENDED] [USE_FRM]
		@end example

		@code{REPAIR TABLE} only works on @code{MyISAM} tables and is the same
		@@ -17724,6 +17724,10 @@ by row instead of creating one index at a time with sorting; This may be
		better than sorting on fixed-length keys if you have long @code{char()}
		keys that compress very good.

		As of MySQL 4.0.2 there is @code{USE_FRM} mode for @code{REPAIR}.
		Use it if @code{.MYI} file is missing or its header is corrupted.
		In this mode MySQL will recreate the table, using information from
		@code{.frm} file. This kind of repair cannot be done with @code{myisamchk}.

		@node Table maintenance, Maintenance regimen, REPAIR TABLE, Disaster Prevention
		@subsection Using @code{myisamchk} for Table Maintenance and Crash Recovery
		@@ -18387,6 +18391,9 @@ a copy in case something goes wrong.)
		Go back to Stage 2. @code{myisamchk -r -q} should work now. (This shouldn't
		be an endless loop.)

		As of MySQL 4.0.2 you can also use @code{REPAIR ... USE_FRM}
		that does the whole procedure automatically.

		@noindent
		@strong{Stage 4: Very difficult repair}

		@@ -48761,6 +48768,8 @@ Our TODO section contains what we plan to have in 4.0. @xref{TODO MySQL 4.0}.

		@itemize @bullet
		@item
		@code{REPAIR ... USE_FRM} added.
		@item
		Fixed bug with indexless boolean full-text search.
		@item
		Fixed bug that sometimes appeared when full-text search was used

include/myisam.h

+1 −1

Original line number	Diff line number	Diff line
		@@ -295,7 +295,7 @@ extern uint mi_get_pointer_length(ulonglong file_length, uint def);
		#define T_QUICK (1L << 30)
		#define T_RETRY_WITHOUT_QUICK (1L << 31)

		/* flags used by myisamchk.c or/and ha_myisam.cc that do NOT passed
		/* flags used by myisamchk.c or/and ha_myisam.cc that are NOT passed
		* to mi_check.c follows:
		* */

sql/sql_table.cc

+57 −4

Original line number	Diff line number	Diff line
		@@ -870,7 +870,8 @@ static int send_check_errmsg(THD* thd, TABLE_LIST* table,
		return 1;
		}

		static int prepare_for_restore(THD* thd, TABLE_LIST* table)
		static int prepare_for_restore(THD* thd, TABLE_LIST* table,
		HA_CHECK_OPT *check_opt)
		{
		DBUG_ENTER("prepare_for_restore");

		@@ -919,6 +920,57 @@ static int prepare_for_restore(THD* thd, TABLE_LIST* table)
		DBUG_RETURN(0);
		}

		static int prepare_for_repair(THD* thd, TABLE_LIST* table,
		HA_CHECK_OPT *check_opt)
		{
		DBUG_ENTER("prepare_for_repair");

		if (!(check_opt->sql_flags & TT_USEFRM))
		{
		DBUG_RETURN(0);
		}
		else
		{

		char from[FN_REFLEN],to[FN_REFLEN];
		char* db = thd->db ? thd->db : table->db;

		sprintf(from, "%s/%s/%s", mysql_real_data_home, db, table->name);
		fn_format(from, from, "", MI_NAME_DEXT, 4);
		sprintf(to,"%s-%lx_%lx", from, current_pid, thd->thread_id);


		my_rename(to, from, MYF(MY_WME));

		if (lock_and_wait_for_table_name(thd,table))
		DBUG_RETURN(-1);

		if (my_rename(from, to, MYF(MY_WME)))
		{
		unlock_table_name(thd, table);
		DBUG_RETURN(send_check_errmsg(thd, table, "repair",
		"Failed renaming .MYD file"));
		}
		if (mysql_truncate(thd, table, 1))
		{
		unlock_table_name(thd, table);
		DBUG_RETURN(send_check_errmsg(thd, table, "repair",
		"Failed generating table from .frm file"));
		}
		if (my_rename(to, from, MYF(MY_WME)))
		{
		unlock_table_name(thd, table);
		DBUG_RETURN(send_check_errmsg(thd, table, "repair",
		"Failed restoring .MYD file"));
		}
		}

		// now we should be able to open the partially repaired table
		// to finish the repair in the handler later on
		if (!(table->table = reopen_name_locked_table(thd, table)))
		unlock_table_name(thd, table);
		DBUG_RETURN(0);
		}

		static int mysql_admin_table(THD* thd, TABLE_LIST* tables,
		HA_CHECK_OPT* check_opt,
		@@ -926,7 +978,7 @@ static int mysql_admin_table(THD* thd, TABLE_LIST* tables,
		thr_lock_type lock_type,
		bool open_for_modify,
		uint extra_open_options,
		int (prepare_func)(THD , TABLE_LIST *),
		int (prepare_func)(THD , TABLE_LIST , HA_CHECK_OPT ),
		int (handler::*operator_func)
		(THD , HA_CHECK_OPT ))
		{
		@@ -960,7 +1012,7 @@ static int mysql_admin_table(THD* thd, TABLE_LIST* tables,
		packet->length(0);
		if (prepare_func)
		{
		switch ((*prepare_func)(thd, table)) {
		switch ((*prepare_func)(thd, table, check_opt)) {
		case 1: continue; // error, message written to net
		case -1: goto err; // error, message could be written to net
		default: ; // should be 0 otherwise
		@@ -1106,7 +1158,8 @@ int mysql_repair_table(THD* thd, TABLE_LIST* tables, HA_CHECK_OPT* check_opt)
		{
		DBUG_ENTER("mysql_repair_table");
		DBUG_RETURN(mysql_admin_table(thd, tables, check_opt,
		"repair", TL_WRITE, 1, HA_OPEN_FOR_REPAIR, 0,
		"repair", TL_WRITE, 1, HA_OPEN_FOR_REPAIR,
		&prepare_for_repair,
		&handler::repair));
		}