How can I force Liquibase to recalculate checksums without re-running the statements?

Question

We're using Liquibase 3.2 with Java 6. Is there a way I can force Liquibase to recalculate checksums without re-running the same statements from our Liquibase files? In our database, I run this ...

update DATABASECHANGELOG set md5sum = null where 1; 

However, when I run my Liquibase change scripts, certain executions still fail with the following errors ...

invoking liquibase change script with file /tmp/deploywork/db.changelog-master.xml running /usr/java/liquibase/liquibase  --logLevel=info --driver=com.mysql.jdbc.Driver --classpath=/usr/java/jboss/modules/com/mysql/main/mysql-connector-java-5.1.22-bin.jar --changeLogFile=/tmp/deploywork/db.changelog-master.xml --url="jdbc:mysql://myservername:3306/my_db" --username=username --password=password update  INFO 5/13/15 2:15 PM: liquibase: Successfully acquired change log lock INFO 5/13/15 2:15 PM: liquibase: Reading from my_db.DATABASECHANGELOG INFO 5/13/15 2:15 PM: liquibase: Successfully released change log lock Unexpected error running Liquibase: Validation Failed:      3 change sets check sum           db.changelog-1.0.xml::1357593229391-25::rob (generated) is now: 7:5cfe9ecd779a71b6287ef2360a6979bf           db.changelog-7.0.xml::create-address-email-index::davea is now: 7:da0132e30ebd6a1bc52d9a39bb8c56d7           db.changelog-7.0.xml::add-myproject-event-object-id-col::davea is now: 7:2eab5d784647ce33ef3488aa8c383443   SEVERE 5/13/15 2:15 PM: liquibase: Validation Failed:      3 change sets check sum           db.changelog-1.0.xml::1357593229391-25::rob (generated) is now: 7:5cfe9ecd779a71b6287ef2360a6979bf           db.changelog-7.0.xml::create-address-email-index::davea is now: 7:da0132e30ebd6a1bc52d9a39bb8c56d7           db.changelog-7.0.xml::add-myproject-event-object-id-col::davea is now: 7:2eab5d784647ce33ef3488aa8c383443  liquibase.exception.ValidationFailedException: Validation Failed:      3 change sets check sum           db.changelog-1.0.xml::1357593229391-25::rob (generated) is now: 7:5cfe9ecd779a71b6287ef2360a6979bf           db.changelog-7.0.xml::create-address-email-index::davea is now: 7:da0132e30ebd6a1bc52d9a39bb8c56d7           db.changelog-7.0.xml::add-myproject-event-object-id-col::davea is now: 7:2eab5d784647ce33ef3488aa8c383443      at liquibase.changelog.DatabaseChangeLog.validate(DatabaseChangeLog.java:181)     at liquibase.Liquibase.update(Liquibase.java:191)     at liquibase.Liquibase.update(Liquibase.java:174)     at liquibase.integration.commandline.Main.doMigration(Main.java:997)     at liquibase.integration.commandline.Main.run(Main.java:170)     at liquibase.integration.commandline.Main.main(Main.java:89) 

Here is one of the change sets that the script is complaining about …

    <changeSet author="davea" id="add-myproject-event-object-id-col">         <addColumn tableName="sb_myproject_event">             <column name="OBJECT_ID" type="VARCHAR(32)"/>         </addColumn>         <createIndex indexName="SB_myproject_EVENT_IDX"             tableName="sb_myproject_event"             unique="false">             <column name="OBJECT_ID" type="varchar(32)" />         </createIndex>         <sql>update sb_myproject_event set object_id=LEFT(SUBSTRING_INDEX(event_data, '&quot;id&quot;:&quot;', -2), 24) where object_id is null and event_data is not null;</sql>         <!--  Delete older events that no longer need to be processed -->         <sql>delete from sb_myproject_event where id not in (select q.* from (select e.id FROM sb_myproject_event e, (select object_id, max(date_processed) d from sb_myproject_event group by object_id) o where e.object_id = o.object_id and e.date_processed = o.d) q);</sql>     </changeSet> 

As I said, I only want to recalculate checksums (have to do this because we're changing Liquibase versions).

Answer 1

Rather than clearing the checksums yourself using SQL, it will probably be better to let Liquibase do that by using the clearCheckSums command:

https://docs.liquibase.com/commands/community/clearchecksums.html

Removes current checksums from database. On next run checksums will be recomputed.

Answer 2

Use the command below if you are using maven:

mvn liquibase:clearCheckSums