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Code Activity

Added count of my_sync calls (to SHOW STATUS)

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tmp_table_size can now be set to 0 (to disable in memory internal temp tables)
Improved speed for internal Maria temp tables:
- Don't use packed keys, except with long text fields.
- Don't copy key all accessed pages during key search.
Some new benchmark tests to sql-bench (for group by)

BUILD/compile-pentium64-gcov:
  Update script to use same pentium_config flags as other tests
BUILD/compile-pentium64-gprof:
  Update script to use same pentium_config flags as other tests
include/my_sys.h:
  Added count of my_sync calls
mysql-test/r/variables.result:
  tmp_table_size can now be set to 0
sql-bench/test-select.sh:
  Added some new test for GROUP BY on a not key field and group by with different order by
sql/mysqld.cc:
  Added count of my_sync calls
  tmp_table_size can now be set to 0 (to disable in memory internal temp tables)
sql/sql_select.cc:
  If tmp_table_size is 0, don't use in memory temp tables (good for benchmarking MyISAM/Maria temp tables)
  Don't pack keys for Maria tables;  The 8K page size makes packed keys too slow for temp tables.
storage/maria/ma_key_recover.h:
  Moved definition to maria_def.h
storage/maria/ma_page.c:
  Moved code used to simplify comparing of identical Maria tables to own function (page_cleanup())
  Fixed that one can read a page with a read lock.
storage/maria/ma_rkey.c:
  For not exact key reads, cache the page where we found key (to speed up future read-next/read-prev calls)
storage/maria/ma_search.c:
  Moved code to cache last key page to separate function.
  Instead of copying pages, only get a link to the page. This notable speeds up key searches on bigger tables.
storage/maria/ma_write.c:
  Added comment
storage/maria/maria_def.h:
  Moved page_cleanup() to separate function.
This commit is contained in:
Michael Widenius
2010-03-09 21:22:24 +02:00
parent 700e2155f2
commit 292f6568fa
14 changed files with 138 additions and 57 deletions
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7
sql/sql_select.cc
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@ -10168,7 +10168,8 @@ create_tmp_table(THD *thd,TMP_TABLE_PARAM *param,List<Item> &fields,
/* future: storage engine selection can be made dynamic? */
if (blob_count || using_unique_constraint ||
(select_options & (OPTION_BIG_TABLES | SELECT_SMALL_RESULT)) ==
OPTION_BIG_TABLES || (select_options & TMP_TABLE_FORCE_MYISAM))
OPTION_BIG_TABLES || (select_options & TMP_TABLE_FORCE_MYISAM) ||
!thd->variables.tmp_table_size)
{
share->db_plugin= ha_lock_engine(0, TMP_ENGINE_HTON);
table->file= get_new_handler(share, &table->mem_root,
@ -10707,7 +10708,7 @@ static bool create_internal_tmp_table(TABLE *table,TMP_TABLE_PARAM *param,
{
/* Create an unique key */
bzero((char*) &keydef,sizeof(keydef));
keydef.flag=HA_NOSAME | HA_BINARY_PACK_KEY | HA_PACK_KEY;
keydef.flag=HA_NOSAME;
keydef.keysegs= keyinfo->key_parts;
keydef.seg= seg;
}
@ -10732,7 +10733,7 @@ static bool create_internal_tmp_table(TABLE *table,TMP_TABLE_PARAM *param,
seg->type= keyinfo->key_part[i].type;
/* Tell handler if it can do suffic space compression */
if (field->real_type() == MYSQL_TYPE_STRING &&
keyinfo->key_part[i].length > 4)
keyinfo->key_part[i].length > 32)
seg->flag|= HA_SPACE_PACK;
}
if (!(field->flags & NOT_NULL_FLAG))