Commit b048cb34 authored by serg@serg.mysql.com's avatar serg@serg.mysql.com
Browse files

bulk_insert feature can be turned off

parent a9fa9842

Docs/manual.texi

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@@ -18370,7 +18370,8 @@ After this many write locks, allow some read locks to run in between. 
MySQL uses special tree-like cache to make bulk inserts (that is,

@code{INSERT ... SELECT}, @code{INSERT ... VALUES (...), (...), ...}, and

@code{LOAD DATA INFILE}) faster. This variable limits

the size of the cache tree in bytes per thread.

the size of the cache tree in bytes per thread. Setting it to 0

will disable this optimization.

@strong{Note:} This cache is only used when adding data to non-empty table.

Default value is 8 MB.

























myisam/mi_write.c



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@@ -809,7 +809,7 @@ int _mi_init_bulk_insert(MI_INFO *info)













    }















  }





























  if (!num_keys)













  if (num_keys==0 || num_keys>myisam_bulk_insert_tree_size)















    return 0;































  info->bulk_insert=(TREE *)

































sql/mysqld.cc



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@@ -2930,7 +2930,7 @@ CHANGEABLE_VAR changeable_vars[] = {













  { "max_write_lock_count",    (long*) &max_write_lock_count,















      ~0L, 1, ~0L, 0, 1 },















  { "myisam_bulk_insert_tree_size", (long*) &myisam_bulk_insert_tree_size,













      8192*1024, 4, ~0L, 0, 1 },













      8192*1024, 0, ~0L, 0, 1 },















  { "myisam_block_size", 	(long*) &opt_myisam_block_size,















      MI_KEY_BLOCK_LENGTH, MI_MIN_KEY_BLOCK_LENGTH, MI_MAX_KEY_BLOCK_LENGTH,















    0, MI_MIN_KEY_BLOCK_LENGTH },