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Merge marko@bk-internal.mysql.com:/home/bk/mysql-4.1

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into hundin.mysql.fi:/home/marko/k/mysql-4.1


innobase/include/row0mysql.h:
  Auto merged
innobase/row/row0sel.c:
  Auto merged
sql/ha_innodb.cc:
  Auto merged
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2005-01-12 14:08:25 +02:00
parent 267407e4ab e8e4861401
commit b895e87772
459 changed files with 76052 additions and 20178 deletions
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20
innobase/include/row0mysql.h
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@ -367,25 +367,7 @@ row_drop_table_for_mysql(
/*************************************************************************
Discards the tablespace of a table which stored in an .ibd file. Discarding
means that this function deletes the .ibd file and assigns a new table id for
the table. Also the flag table->ibd_file_missing is set TRUE.
How do we prevent crashes caused by ongoing operations on the table? Old
operations could try to access non-existent pages.
1) SQL queries, INSERT, SELECT, ...: we must get an exclusive MySQL table lock
on the table before we can do DISCARD TABLESPACE. Then there are no running
queries on the table.
2) Purge and rollback: we assign a new table id for the table. Since purge and
rollback look for the table based on the table id, they see the table as
'dropped' and discard their operations.
3) Insert buffer: we remove all entries for the tablespace in the insert
buffer tree; as long as the tablespace mem object does not exist, ongoing
insert buffer page merges are discarded in buf0rea.c. If we recreate the
tablespace mem object with IMPORT TABLESPACE later, then the tablespace will
have the same id, but the tablespace_version field in the mem object is
different, and ongoing old insert buffer page merges get discarded.
4) Linear readahead and random readahead: we use the same method as in 3) to
discard ongoing operations. */
the table. Also the flag table->ibd_file_missing is set TRUE. */
int
row_discard_tablespace_for_mysql(