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author | Sergey Petrunya <psergey@askmonty.org> | 2014-03-04 16:15:58 +0400 |
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committer | Sergey Petrunya <psergey@askmonty.org> | 2014-03-04 16:15:58 +0400 |
commit | bc96ce55090756e8a3725fc61d0dddaa952a5f22 (patch) | |
tree | 080d9a252fa6a51837652f2ce66b3b5e0cda1209 /client | |
parent | 7449c7d32b2b2847f821c8c547c255e861cd60bd (diff) | |
download | mariadb-git-bc96ce55090756e8a3725fc61d0dddaa952a5f22.tar.gz |
MDEV-5723: mysqldump -uroot unusable for multi-database operations, checks all databases
- MariaDB-5.5 part of the fix: since we can't easily fix query optimization for I_S tables,
run the affected-tablespaces query with semijoin=off. It happens to have a good query plan
with that setting.
Diffstat (limited to 'client')
-rw-r--r-- | client/mysqldump.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/client/mysqldump.c b/client/mysqldump.c index b4c045c18b0..a8c201082d9 100644 --- a/client/mysqldump.c +++ b/client/mysqldump.c @@ -3991,7 +3991,13 @@ static int dump_tablespaces(char* ts_where) char *ubs; char *endsemi; DBUG_ENTER("dump_tablespaces"); - + + /* + Try to turn off semi-join optimization (if that fails, this is a + pre-optimizer_switch server, and the old query plan is ok for us. + */ + mysql_query(mysql, "set optimizer_switch='semijoin=off'"); + init_dynamic_string_checked(&sqlbuf, "SELECT LOGFILE_GROUP_NAME," " FILE_NAME," @@ -4151,6 +4157,8 @@ static int dump_tablespaces(char* ts_where) mysql_free_result(tableres); dynstr_free(&sqlbuf); + mysql_query(mysql, "set optimizer_switch=default"); + DBUG_RETURN(0); } |