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Bug#38002 table_cache consumes too much memory with blobs

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Tables in the table definition cache are keeping a cache buffer for blob
fields which can consume a lot of memory.
    
This patch introduces a maximum size threshold for these buffers.


sql/sql_base.cc:
  Added function free_field_buffers_larger_than to reclaim memory from blob
  field buffers too large to be cached.
sql/table.cc:
  Added function free_field_buffers_larger_than
This commit is contained in:
Kristofer Pettersson 2008-07-24 22:38:44 +02:00
commit 548413824b
5 changed files with 29 additions and 1 deletions
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2
sql/field.h
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@ -13,7 +13,6 @@
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
/*
Because of the function new_field() all field classes that have static
variables must declare the size_of() member function.
@ -1669,6 +1668,7 @@ public:
}
int reset(void) { bzero(ptr, packlength+sizeof(uchar*)); return 0; }
void reset_fields() { bzero((uchar*) &value,sizeof(value)); }
uint32 get_field_buffer_size(void) { return value.alloced_length(); }
#ifndef WORDS_BIGENDIAN
static
#endif