WL#86: Partitioned key cache for MyISAM.

This is the base patch for the task.

1 files changed, 265 insertions, 3 deletions

diff --git a/mysql-test/t/key_cache.test b/mysql-test/t/key_cache.test
index 4c14dc96aaa..f0222353b15 100644
--- a/mysql-test/t/key_cache.test
+++ b/mysql-test/t/key_cache.test
@@ -1,11 +1,13 @@
 #
-# Test of multiple key caches
+# Test of multiple key caches, simple an partitioned
 #
 --disable_warnings
 drop table if exists t1, t2, t3;
 --enable_warnings
 
-SET @save_key_buffer=@@key_buffer_size;
+SET @save_key_buffer_size=@@key_buffer_size;
+SET @save_key_cache_block_size=@@key_cache_block_size;
+SET @save_key_cache_partitions=@@key_cache_partitions;
 
 SELECT @@key_buffer_size, @@small.key_buffer_size;
 
@@ -33,7 +35,7 @@ SELECT @@`default`.key_buffer_size;
 SELECT @@small.key_buffer_size;
 SELECT @@medium.key_buffer_size;
 
-SET @@global.key_buffer_size=@save_key_buffer;
+SET @@global.key_buffer_size=@save_key_buffer_size;
 
 #
 # Errors
@@ -247,3 +249,263 @@ SET GLOBAL key_cache_block_size= @bug28478_key_cache_block_size;
 DROP TABLE t1;
 
 # End of 4.1 tests
+
+#
+# Test cases for partitioned key caches
+#
+
+# Test usage of the KEY_CACHE table from information schema
+# for a simple key cache
+ 
+set global key_buffer_size=@save_key_buffer_size;
+set global key_cache_block_size=@save_key_cache_block_size;
+select @@key_buffer_size;
+select @@key_cache_block_size;
+select @@key_cache_partitions;
+
+create table t1 (
+  p int not null auto_increment primary key,
+  a char(10));
+create table t2 (
+  p int  not null auto_increment primary key,
+  i int, a char(10), key k1(i), key k2(a));
+
+select @@key_cache_partitions;
+--replace_column 7 #
+select * from information_schema.key_caches;
+
+insert into t1 values (1, 'qqqq'), (2, 'yyyy');
+insert into t2 values (1, 1, 'qqqq'), (2, 1, 'pppp'),
+                      (3, 1, 'yyyy'), (4, 3, 'zzzz');
+select * from t1;
+select * from t2;
+update t1 set p=3 where p=1;
+update t2 set i=2 where i=1;
+
+--replace_result 1808 KEY_BLOCKS_UNUSED 1670 KEY_BLOCKS_UNUSED 
+show status like 'key_%';
+--replace_column 7 #
+select * from information_schema.key_caches;
+
+delete from t2 where a='zzzz';
+--replace_column 7 #
+select * from information_schema.key_caches;
+
+delete from t1;
+delete from t2;
+--replace_column 7 #
+select * from information_schema.key_caches;
+
+# For the key cache with 2 partitions execute the same sequence of
+# statements as for the simple cache above.
+# The statistical information on the number of i/o requests and
+# the number of is expected to be the same.    
+
+set global key_cache_partitions=2;
+select @@key_cache_partitions;
+--replace_column 7 #
+select * from information_schema.key_caches;
+
+insert into t1 values (1, 'qqqq'), (2, 'yyyy');
+insert into t2 values (1, 1, 'qqqq'), (2, 1, 'pppp'),
+                      (3, 1, 'yyyy'), (4, 3, 'zzzz');
+select * from t1;
+select * from t2;
+update t1 set p=3 where p=1;
+update t2 set i=2 where i=1;
+
+--replace_result 1808 KEY_BLOCKS_UNUSED 1670 KEY_BLOCKS_UNUSED 
+show status like 'key_%';
+--replace_column 7 #
+select * from information_schema.key_caches;
+
+delete from t1;
+delete from t2;
+--replace_column 7 #
+select * from information_schema.key_caches;
+
+# Check that we can work with one partition with the same results
+
+set global key_cache_partitions=1;
+select @@key_cache_partitions;
+--replace_column 7 #
+select * from information_schema.key_caches;
+
+insert into t1 values (1, 'qqqq'), (2, 'yyyy');
+insert into t2 values (1, 1, 'qqqq'), (2, 1, 'pppp'),
+                      (3, 1, 'yyyy'), (4, 3, 'zzzz');
+select * from t1;
+select * from t2;
+update t1 set p=3 where p=1;
+update t2 set i=2 where i=1;
+
+--replace_result 1808 KEY_BLOCKS_UNUSED 1670 KEY_BLOCKS_UNUSED 
+show status like 'key_%';
+--replace_column 7 #
+select * from information_schema.key_caches;
+
+delete from t1;
+delete from t2;
+--replace_column 7 #
+select * from information_schema.key_caches;
+
+flush tables; flush status;
+--replace_column 7 #
+select * from information_schema.key_caches;
+
+# Switch back to 2 partitions
+
+set global key_buffer_size=32*1024;
+select @@key_buffer_size;
+set global key_cache_partitions=2;
+select @@key_cache_partitions;
+--replace_column 7 #
+select * from information_schema.key_caches;
+
+insert into t1 values (1, 'qqqq'), (2, 'yyyy');
+insert into t2 values (1, 1, 'qqqq'), (2, 1, 'pppp'),
+                      (3, 1, 'yyyy'), (4, 3, 'zzzz');
+select * from t1;
+select * from t2;
+update t1 set p=3 where p=1;
+update t2 set i=2 where i=1;
+
+--replace_column 7 #
+select * from information_schema.key_caches;
+
+# Add more rows to tables t1 and t2 
+
+insert into t1(a) select a from t1;
+insert into t1(a) select a from t1;
+insert into t1(a) select a from t1;
+insert into t1(a) select a from t1;
+insert into t1(a) select a from t1;
+insert into t1(a) select a from t1;
+insert into t1(a) select a from t1;
+insert into t1(a) select a from t1;
+
+insert into t2(i,a) select i,a from t2;
+insert into t2(i,a) select i,a from t2;
+insert into t2(i,a) select i,a from t2;
+insert into t2(i,a) select i,a from t2;
+insert into t2(i,a) select i,a from t2;
+insert into t2(i,a) select i,a from t2;
+insert into t2(i,a) select i,a from t2;
+insert into t2(i,a) select i,a from t2;
+
+--replace_column 6 # 7 # 10 #
+select * from information_schema.key_caches;
+
+select * from t1 where p between 1010 and 1020 ;
+select * from t2 where p between 1010 and 1020 ;
+--replace_column 6 # 7 # 10 #
+select * from information_schema.key_caches;
+
+flush tables; flush status;
+update t1 set a='zzzz' where a='qqqq';
+update t2 set i=1 where i=2;
+--replace_column 6 # 7 #
+select * from information_schema.key_caches;
+
+# Now test how we can work with 7 partitions 
+
+set global keycache1.key_buffer_size=256*1024;
+select @@keycache1.key_buffer_size;
+set global keycache1.key_cache_partitions=7;
+select @@keycache1.key_cache_partitions;
+
+--replace_column 6 # 7 #
+select * from information_schema.key_caches;
+--replace_column 7 #
+select * from information_schema.key_caches where key_cache_name like "key%";
+
+cache index t1 key (`primary`) in keycache1;
+
+explain select p from t1 where p between 1010 and 1020;
+select p from t1 where p between 1010 and 1020;
+explain select i from t2 where p between 1010 and 1020;
+select i from t2 where p between 1010 and 1020;
+explain select count(*) from t1, t2 where t1.p = t2.i;
+select count(*) from t1, t2 where t1.p = t2.i;
+
+--replace_column 6 # 7 #
+select * from information_schema.key_caches;
+--replace_column 7 #
+select * from information_schema.key_caches where key_cache_name like "key%";
+
+cache index t2 in keycache1;
+update t2 set p=p+3000, i=2 where a='qqqq';
+--replace_column 7 #
+select * from information_schema.key_caches where key_cache_name like "key%";
+
+set global keycache2.key_buffer_size=1024*1024;
+cache index t2 in keycache2;
+insert into t2 values (2000, 3, 'yyyy');
+--replace_column 7 #
+select * from information_schema.key_caches where key_cache_name like "keycache2";
+--replace_column 7 #
+select * from information_schema.key_caches where key_cache_name like "key%";
+
+cache index t2 in keycache1;
+update t2 set p=p+5000 where a='zzzz';
+select * from t2 where p between 1010 and 1020;
+explain select p from t2  where p between 1010 and 1020;
+select p from t2 where p between 1010 and 1020;
+explain select i from t2 where a='yyyy' and i=3;
+select i from t2 where a='yyyy' and i=3;
+explain select a from t2 where a='yyyy' and i=3;
+select a from t2 where a='yyyy' and i=3 ;
+--replace_column 6 # 7 #
+select * from information_schema.key_caches;
+
+set global keycache1.key_cache_block_size=2*1024;
+insert into t2 values (7000, 3, 'yyyy');
+--replace_column 6 # 7 #
+select * from information_schema.key_caches;
+
+set global keycache1.key_cache_block_size=8*1024;
+insert into t2 values (8000, 3, 'yyyy');
+--replace_column 6 # 7 #
+select * from information_schema.key_caches;
+
+set global keycache1.key_buffer_size=64*1024;
+--replace_column 6 # 7 #
+select * from information_schema.key_caches;
+
+set global keycache1.key_cache_block_size=2*1024;
+--replace_column 6 # 7 #
+select * from information_schema.key_caches;
+
+set global keycache1.key_cache_block_size=8*1024;
+--replace_column 6 # 7 #
+select * from information_schema.key_caches;
+
+set global keycache1.key_buffer_size=0;
+--replace_column 6 # 7 #
+select * from information_schema.key_caches;
+
+set global keycache1.key_cache_block_size=8*1024;
+--replace_column 6 # 7 #
+select * from information_schema.key_caches;
+
+set global keycache1.key_buffer_size=0;
+--replace_column 6 # 7 #
+select * from information_schema.key_caches;
+
+set global keycache1.key_buffer_size=128*1024;
+--replace_column 6 # 7 #
+select * from information_schema.key_caches;
+
+set global keycache1.key_cache_block_size=1024;
+--replace_column 6 # 7 #
+select * from information_schema.key_caches;
+
+drop table t1,t2;
+
+set global keycache1.key_buffer_size=0;
+set global keycache2.key_buffer_size=0;
+
+set global key_buffer_size=@save_key_buffer_size;
+set global key_cache_partitions=@save_key_cache_partitions;
+
+#End of 5.1 tests