SET @transaction_isolation= @@global.transaction_isolation;
SET GLOBAL TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;
INSERT INTO cache_policies VALUES("cache_policy", "innodb_only",
"innodb_only", "innodb_only", "innodb_only");
INSERT INTO config_options VALUES("separator", "|");
INSERT INTO containers VALUES ("desc_t1", "test", "t1",
"c1", "c2,c21", "c3", "c4", "c5", "PRIMARY");
CREATE USER mysqltest1@localhost;
connect  mysqltest1,localhost,mysqltest1,,;
connection mysqltest1;
USE test;
DROP TABLE IF EXISTS t1;
CREATE TABLE t1        (c1  VARCHAR(32),
c11 VARCHAR(32),
c2  VARCHAR(1024),
c21 VARCHAR(1024),
c3 INT, c4 BIGINT UNSIGNED, c5 INT, primary key(c1))
ENGINE=INNODB;
INSERT INTO t1 VALUES ('D','D', 'Darmstadt', 'City', 0, 0, 0);
INSERT INTO t1 VALUES ('B','B', 'Berlin', 'Mitte', 0, 0, 0);
INSERT INTO t1 VALUES ('C','C', 'Cottbus', 'West', 0, 0 ,0);
INSERT INTO t1 VALUES ('H','H', 'Hamburg', 'Norderstedt', 0, 0, 0);
connection default;
INSTALL PLUGIN daemon_memcached SONAME 'libmemcached.so';
connection mysqltest1;
USE test;
SELECT c1,c11,c2,c21 FROM t1;
c1	c11	c2	c21
B	B	Berlin	Mitte
C	C	Cottbus	West
D	D	Darmstadt	City
H	H	Hamburg	Norderstedt
Here are the memcached results with D,B,H,C:
Darmstadt|City
Berlin|Mitte
Hamburg|Norderstedt
Cottbus|West
SELECT c1,c11,c2,c21 FROM t1;
c1	c11	c2	c21
B	B	Berlin	Mitte
C	C	Cottbus	West
D	D	Darmstadt	City
H	H	Hamburg	Norderstedt
Here are the memcached results after set:
Essen|Ost
SELECT c1,c11,c2,c21 FROM t1;
c1	c11	c2	c21
B	B	Berlin	Mitte
C	C	Cottbus	West
D	D	Darmstadt	City
E	NULL	Essen	Ost
H	H	Hamburg	Norderstedt
Here are the memcached results after add:
Frankfurt|Sachsenhause
SELECT c1,c11,c2,c21 FROM t1;
c1	c11	c2	c21
B	B	Berlin	Mitte
C	C	Cottbus	West
D	D	Darmstadt	City
E	NULL	Essen	Ost
F	NULL	Frankfurt	Sachsenhause
H	H	Hamburg	Norderstedt
Here are the memcached results after replace:
Frankfurt a. M.|Sachsenhausen
SELECT c1,c11,c2,c21 FROM t1;
c1	c11	c2	c21
B	B	Berlin	Mitte
C	C	Cottbus	West
D	D	Darmstadt	City
E	NULL	Essen	Ost
F	NULL	Frankfurt a. M.	Sachsenhausen
H	H	Hamburg	Norderstedt
Here are the memcached results after delete:
SELECT c1,c11,c2,c21 FROM t1;
c1	c11	c2	c21
B	B	Berlin	Mitte
C	C	Cottbus	West
D	D	Darmstadt	City
E	NULL	Essen	Ost
H	H	Hamburg	Norderstedt
Here are the memcached results after add Frankfurt|Airport:
Frankfurt|Airport
SELECT c1,c11,c2,c21 FROM t1;
c1	c11	c2	c21
B	B	Berlin	Mitte
C	C	Cottbus	West
D	D	Darmstadt	City
E	NULL	Essen	Ost
F	NULL	Frankfurt	Airport
H	H	Hamburg	Norderstedt
Here are the memcached results after replace Frankfurt a.M|Sachsenhausen.:
Frankfurt a. M.|Sachsenhausen
SELECT c1,c11,c2,c21 FROM t1;
c1	c11	c2	c21
B	B	Berlin	Mitte
C	C	Cottbus	West
D	D	Darmstadt	City
E	NULL	Essen	Ost
F	NULL	Frankfurt a. M.	Sachsenhausen
H	H	Hamburg	Norderstedt
connection default;
UNINSTALL PLUGIN daemon_memcached;
ALTER TABLE test.t1 DROP PRIMARY KEY;
INSTALL PLUGIN daemon_memcached SONAME 'libmemcached.so';
connection mysqltest1;
Here are the memcached results after set:
SELECT c1,c11,c2,c21 FROM t1;
c1	c11	c2	c21
B	B	Berlin	Mitte
C	C	Cottbus	West
D	D	Darmstadt	City
E	NULL	Essen	Ost
F	NULL	Frankfurt a. M.	Sachsenhausen
H	H	Hamburg	Norderstedt
connection default;
UNINSTALL PLUGIN daemon_memcached;
ALTER TABLE test.t1 ADD CONSTRAINT PRIMARY KEY (c1);
INSTALL PLUGIN daemon_memcached SONAME 'libmemcached.so';
SHOW CREATE TABLE test.t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `c1` varchar(32) NOT NULL,
  `c11` varchar(32) DEFAULT NULL,
  `c2` varchar(1024) DEFAULT NULL,
  `c21` varchar(1024) DEFAULT NULL,
  `c3` int(11) DEFAULT NULL,
  `c4` bigint(20) unsigned DEFAULT NULL,
  `c5` int(11) DEFAULT NULL,
  PRIMARY KEY (`c1`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
connection mysqltest1;
Here are the memcached results after set:
Essen|Ost
Frankfurt a. M.|Sachsenhausen
Hamburg|Norderstedt
SELECT c1,c11,c2,c21 FROM t1;
c1	c11	c2	c21
B	B	Berlin	Mitte
C	C	Cottbus	West
D	D	Darmstadt	City
E	NULL	Essen	Ost
F	NULL	Frankfurt a. M.	Sachsenhausen
H	H	Hamburg	Norderstedt
connection default;
UNINSTALL PLUGIN daemon_memcached;
ALTER TABLE test.t1 DROP COLUMN c1;
UPDATE innodb_memcache.containers set key_columns = "c11", unique_idx_name_on_key="idx";
create unique index idx on test.t1(c11);
INSTALL PLUGIN daemon_memcached SONAME 'libmemcached.so';
connection mysqltest1;
Here are the memcached results after add:
Essen|Ost
Frankfurt|Sachsenhause
Hamburg|Norderstedt
SELECT c11,c2,c21 FROM t1;
c11	c2	c21
B	Berlin	Mitte
C	Cottbus	West
D	Darmstadt	City
E	Essen	Ost
F	Frankfurt	Sachsenhause
H	Hamburg	Norderstedt
NULL	Essen	Ost
NULL	Frankfurt a. M.	Sachsenhausen
DROP TABLE t1;
connection default;
disconnect mysqltest1;
UNINSTALL PLUGIN daemon_memcached;
DROP DATABASE innodb_memcache;
DROP USER mysqltest1@localhost;
SET @@global.transaction_isolation= @transaction_isolation;