Im trying to get the 10 best matches of a fulltext search using fulltext score.
Following query works perfectly on my 10M lines MyISAM table :
SELECT index, MATCH(villes) AGAINST('montreuil') as score FROM ( SELECT index, villes FROM table WHERE MATCH(villes) AGAINST('montreuil' IN BOOLEAN MODE) ) t
However, when I get an error when trying to retrieve to order scores :
SELECT index FROM ( *** PREVIOUS QUERY *** ) t2 ORDER BY t2.score
Error is : "Lost connection to mysql server" in mysql workbench after 4 seconds.
So far I've tried:
The mysql log is unclear to me :
10:10:58 UTC - mysqld got exception 0xc00000fd ; This could be because you hit a bug. It is also possible that this binary or one of the libraries it was linked against is corrupt, improperly built, or misconfigured. This error can also be caused by malfunctioning hardware. Attempting to collect some information that could help diagnose the problem. As this is a crash and something is definitely wrong, the information collection process might fail. key_buffer_size=67108864 read_buffer_size=8388608 max_used_connections=3 max_threads=151 thread_count=2 connection_count=2 It is possible that mysqld could use up to key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 2541349 K bytes of memory Hope that's ok; if not, decrease some variables in the equation. Thread pointer: 0x21ee0a9b580 Attempting backtrace. You can use the following information to find out where mysqld died. If you see no messages after this, something went terribly wrong... 2019-04-16T10:11:12.359438Z 0 [Warning] 'NO_AUTO_CREATE_USER' sql mode was not set.
SHOW CREATE TABLE :
'CREATE TABLE `table` ( `index` int(11) NOT NULL, `villes` text, PRIMARY KEY (`index`), FULLTEXT KEY `villes` (`villes`) ) ENGINE=MyISAM DEFAULT CHARSET=utf8'
type: fulltext possible keys: villes key: villes ref: const rows: 1 filtered: 100.00 extra: using where, using filesort
I couldnt find a direct solution to this problem. I read some posts explaining that sorting a subquery using fulltext might cause some memory issues.
However a workaround was to create a temporary table with the result of the subquery and sort it which works perfectly.
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