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Problem:- In replication if slave has extra persistent column then these column are not computed while applying write-set from master. Solution:- While applying row events from server, we will generate values for extra persistent columns.
203 lines
2.6 KiB
Text
203 lines
2.6 KiB
Text
include/master-slave.inc
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[connection master]
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connection master;
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create table t1(a int primary key);
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insert into t1 values(1);
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insert into t1 values(2);
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insert into t1 values(3);
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insert into t1 values(4);
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connection slave;
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select * from t1 order by a;
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a
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1
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2
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3
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4
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alter table t1 add column z1 int as(a+1) virtual, add column z2 int as (a+2) persistent;
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select * from t1 order by a;
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a z1 z2
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1 2 3
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2 3 4
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3 4 5
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4 5 6
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connection master;
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insert into t1 values(5);
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insert into t1 values(6);
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connection slave;
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select * from t1 order by a;
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a z1 z2
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1 2 3
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2 3 4
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3 4 5
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4 5 6
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5 6 7
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6 7 8
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#UPDATE query
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connection master;
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update t1 set a = a+10;
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select * from t1 order by a;
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a
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11
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12
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13
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14
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15
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16
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connection slave;
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select * from t1 order by a;
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a z1 z2
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11 12 13
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12 13 14
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13 14 15
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14 15 16
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15 16 17
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16 17 18
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connection master;
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update t1 set a = a-10;
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select * from t1 order by a;
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a
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1
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2
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3
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4
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5
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6
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connection slave;
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select * from t1 order by a;
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a z1 z2
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1 2 3
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2 3 4
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3 4 5
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4 5 6
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5 6 7
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6 7 8
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#DELETE quert
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connection master;
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delete from t1 where a > 2 and a < 4;
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select * from t1 order by a;
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a
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1
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2
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4
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5
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6
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connection slave;
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select * from t1 order by a;
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a z1 z2
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1 2 3
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2 3 4
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4 5 6
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5 6 7
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6 7 8
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#REPLACE query
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connection master;
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replace into t1 values(1);
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replace into t1 values(3);
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replace into t1 values(1);
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connection slave;
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select * from t1 order by a;
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a z1 z2
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1 2 3
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2 3 4
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3 4 5
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4 5 6
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5 6 7
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6 7 8
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#SELECT query
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connection master;
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select * from t1 where a > 2 and a < 4;
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a
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3
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connection slave;
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select * from t1 where a > 2 and a < 4;
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a z1 z2
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3 4 5
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#UPDATE with SELECT query
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connection master;
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update t1 set a = a + 10 where a > 2 and a < 4;
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select * from t1 order by a;
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a
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1
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2
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4
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5
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6
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13
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connection slave;
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select * from t1 order by a;
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a z1 z2
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1 2 3
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2 3 4
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4 5 6
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5 6 7
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6 7 8
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13 14 15
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connection master;
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update t1 set a = a - 10 where a = 13;
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select * from t1 order by a;
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a
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1
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2
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3
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4
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5
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6
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connection slave;
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select * from t1 order by a;
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a z1 z2
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1 2 3
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2 3 4
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3 4 5
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4 5 6
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5 6 7
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6 7 8
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#Break Unique Constraint
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alter table t1 add column z4 int as (a % 6) persistent unique;
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connection master;
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#entering duplicate value for slave persistent column
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insert into t1 values(7);
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select * from t1 order by a;
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a
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1
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2
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3
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4
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5
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6
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7
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connection slave;
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include/wait_for_slave_sql_error.inc [errno=1062]
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select * from t1 order by a;
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a z1 z2 z4
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1 2 3 1
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2 3 4 2
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3 4 5 3
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4 5 6 4
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5 6 7 5
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6 7 8 0
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alter table t1 drop column z4;
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start slave;
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include/wait_for_slave_sql_to_start.inc
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connection master;
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connection slave;
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select * from t1 order by a;
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a z1 z2
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1 2 3
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2 3 4
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3 4 5
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4 5 6
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5 6 7
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6 7 8
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7 8 9
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connection master;
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select * from t1 order by a;
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a
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1
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2
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3
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4
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5
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6
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7
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drop table t1;
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include/rpl_end.inc
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