From 38e395aa325eb418cf92a6ce62646959ee2ed477 Mon Sep 17 00:00:00 2001
From: unknown <msvensson@neptunus.homeip.net>
Date: Tue, 1 Feb 2005 15:43:08 +0100
Subject: WL#2269 Enable query cache for NDB - Added a thread that fetches
 commit_count for open tables. This will mean that NDB will not have to be
 contacted for every use of a cached query.

sql/ha_ndbcluster.cc:
  Added a thread that periodically will fetch commit_count
  for open tables and store that value in share.
  The commit count value is then used when query cache
  asks if a cached query can be used.
  The thread activation interval is regulated by the
  config variable ndb_cache_check_time, it's default value is 0
  which means that NDB is contacted every time a cached query is reused.
sql/ha_ndbcluster.h:
  Added commit_count to share
  Added ndb_cache_check_time
sql/mysqld.cc:
  Added config variable ndb_cache_check_time
sql/set_var.cc:
  Added config variable ndb_cache_check_time
---
 mysql-test/r/ndb_cache_multi2.result | 74 ++++++++++++++++++++++++++++++++++++
 1 file changed, 74 insertions(+)
 create mode 100644 mysql-test/r/ndb_cache_multi2.result

(limited to 'mysql-test/r/ndb_cache_multi2.result')

diff --git a/mysql-test/r/ndb_cache_multi2.result b/mysql-test/r/ndb_cache_multi2.result
new file mode 100644
index 00000000000..6e435c071b5
--- /dev/null
+++ b/mysql-test/r/ndb_cache_multi2.result
@@ -0,0 +1,74 @@
+drop table if exists t1, t2;
+set GLOBAL query_cache_type=on;
+set GLOBAL query_cache_size=1355776;
+set GLOBAL ndb_cache_check_time=1;
+reset query cache;
+flush status;
+set GLOBAL query_cache_type=on;
+set GLOBAL query_cache_size=1355776;
+set GLOBAL ndb_cache_check_time=1;
+reset query cache;
+flush status;
+create table t1 (a int) engine=ndbcluster;
+create table t2 (a int) engine=ndbcluster;
+insert into t1 value (2);
+insert into t2 value (3);
+select * from t1;
+a
+2
+select * from t2;
+a
+3
+show status like "Qcache_queries_in_cache";
+Variable_name	Value
+Qcache_queries_in_cache	2
+show status like "Qcache_inserts";
+Variable_name	Value
+Qcache_inserts	2
+show status like "Qcache_hits";
+Variable_name	Value
+Qcache_hits	0
+show status like "Qcache_queries_in_cache";
+Variable_name	Value
+Qcache_queries_in_cache	0
+show status like "Qcache_inserts";
+Variable_name	Value
+Qcache_inserts	0
+show status like "Qcache_hits";
+Variable_name	Value
+Qcache_hits	0
+select * from t1;
+a
+2
+show status like "Qcache_queries_in_cache";
+Variable_name	Value
+Qcache_queries_in_cache	1
+show status like "Qcache_inserts";
+Variable_name	Value
+Qcache_inserts	1
+show status like "Qcache_hits";
+Variable_name	Value
+Qcache_hits	0
+update t1 set a=3 where a=2;
+show status like "Qcache_queries_in_cache";
+Variable_name	Value
+Qcache_queries_in_cache	2
+show status like "Qcache_inserts";
+Variable_name	Value
+Qcache_inserts	2
+show status like "Qcache_hits";
+Variable_name	Value
+Qcache_hits	0
+select * from t1;
+a
+3
+show status like "Qcache_queries_in_cache";
+Variable_name	Value
+Qcache_queries_in_cache	2
+show status like "Qcache_inserts";
+Variable_name	Value
+Qcache_inserts	3
+show status like "Qcache_hits";
+Variable_name	Value
+Qcache_hits	0
+drop table t1, t2;
-- 
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