Hi,

Merging the two fields could be done in a few ways.

If you wanted to do it at the database level all at once (make sure to backup 
first!), you could just move all the values in "metadatavalue" table from 
"metadata_field_id" 76 into field 64.  Then, remove field 76 and do a full 
reindex (./dspace index-discovery -b) of the site.  Finally, you'd want to 
likely test the site again to ensure that moving those values had no negative 
impact on the Items that used to use field 76.

If you don't want to do this at the database level, you might be able to use 
Batch Metadata Editing tools to export metadata to CSV, move it and reimport: 
https://wiki.lyrasis.org/display/DSDOC7x/Batch+Metadata+Editing  Though the 
challenge there would be differentiating field 76 from 64, as they both may 
appear as "dc.title".  So, it may be difficult to tell which field you are 
moving values into...but as long as you get all the values into the same field 
(whether 76 or 64), then you should be able to remove the other field.

Tim

________________________________
From: [email protected] <[email protected]> on behalf of 
Night Librarian <[email protected]>
Sent: Tuesday, March 1, 2022 2:21 PM
To: DSpace Technical Support <[email protected]>
Subject: Re: [dspace-tech] Re: Database migrate problem while upgrading from 
4.0 to 7.2

Many thanks.

I have no problem merging 76 ("A name given to the resource") into 64 ("Title 
statement/title proper").  I exported the database into a sandbox virtual 
machine, so I can experiment with the upgrade and revert to snapshots, until I 
get it right.  Just wondering how to merge/combine them?



On Tuesday, March 1, 2022 at 2:35:47 p.m. UTC-4 Tim Donohue wrote:
Unfortunately, I don't have a great suggestion here as this is an odd scenario. 
 DSpace shouldn't let you create two of the exact same metadata fields, so I'm 
not sure how this happened.

I'd recommend looking more closely at the values in each of those fields and 
trying to determine which one is the correct "dc.title".

As a "guess", it might be the one which says "Title statement/title proper." 
since that's the default description for "dc.title" in DSpace 4.x: 
https://github.com/DSpace/DSpace/blob/dspace-4_x/dspace/config/registries/dublin-core-types.xml#L562-L568

However, before you do anything, I'd highly recommend backing up your database. 
 That way, if you make a mistake and choose the wrong "dc.title" (or things 
break after you move your data), then you can revert and try again.

Tim
________________________________
From: [email protected] <[email protected]> on behalf of Night 
Librarian <[email protected]>
Sent: Tuesday, March 1, 2022 12:26 PM
To: DSpace Technical Support <[email protected]>
Subject: [dspace-tech] Re: Database migrate problem while upgrading from 4.0 to 
7.2

I see now.  When I run select metadata_field_id from metadatafieldregistry 
where metadata_schema_id=(select metadata_schema_id from metadataschemaregistry 
where short_id='dc') and element = 'title' and qualifier is null;, it returns 
64 and 76.

64;1;"title";"";"Title statement/title proper."
76;1;"title";"";"A name given to the resource"

select * from metadatavalue where metadata_field_id = '64';  shows  that it's 
used in 348 rows.
select * from metadatavalue where metadata_field_id = '76';  shows  that it's 
used in 1518 rows.

Could you suggest a way of merging these values into one?  Does it matter into 
which one?



On Tuesday, March 1, 2022 at 11:27:27 a.m. UTC-4 Tim Donohue wrote:
Hi,

You misunderstood my second point in my previous message.  The error you got 
initially was saying that somehow you have two "dc.title" fields in your 
database (which shouldn't happen).  So, the problem wasn't the 
"dc.title.alternative" field, as that is a different field from 
"dc.title"...it's that you may have two "dc.title" fields (exact same name).

Try this query and see if it returns multiple results (this is the query that 
is being run by the migration to find your "dc.title" field):

select metadata_field_id from metadatafieldregistry where 
metadata_schema_id=(select metadata_schema_id from metadataschemaregistry where 
short_id='dc') and element = 'title' and qualifier is null;

This query won't change anything in your system, but it sounds like it might 
return *2 results* instead of the expected *1 result*.

If it does return *2 results*, you need to figure out how you have two 
different "dc.title" fields, and remove one of them.
This may require determining which is being used to store metadata (as you 
cannot delete a field that is being used -- this is the error you got when 
trying to delete "dc.title.alternative").
If both fields are in use, then you would need to migrate all existing 
"dc.title" values from one field to the other.

Overall, this is a strange scenario, as I've never heard of a case where a 
DSpace had two of the same metadata field. Hopefully it'll be easy enough to 
resolve, once you find the duplicate fields.

Let us know what you find on this list,
Tim

On Monday, February 28, 2022 at 10:59:48 PM UTC-6 Night Librarian wrote:
Thank you very much, Tim.

The first part is fixed.  I replaced the 7.2 update-sequences.sql by the 
dspace-4.x version and now it works great:


$ ./dspace database update-sequences

Running org/dspace/storage/rdbms/sqlmigration/postgres/update-sequences.sql

update-sequences complete

==========================================

As to the $./dspace database migrate ignored part, I checked the 
metadatafieldregistry table and it had 2 rows for title:

metadata_field_id   metadata_schema_id   element   qualifier          scope_note
76                              1                                        title  
         [null]               A name given to the resource
77                              1                                        title  
         alternative     An alternate name given to the resource

I wasn't sure which to delete, so I tried to delete the alternative one:


delete from metadatafieldregistry

where  metadata_field_id = 77;



and got this:



ERROR: update or delete on table "metadatafieldregistry" violates foreign key 
constraint "metadatavalue_metadata_field_id_fkey" on table "metadatavalue" 
DETAIL: Key (metadata_field_id)=(77) is still referenced from table 
"metadatavalue". SQL state: 23503

Then I looked at the metadatavalue table and it has 1500 rows with 
metadata_field_id = 76 and only 28 rows with 77.  I decided to delete these 28 
rows, after which I was able to delete metadata_field_id = 77 in the 
metadatafieldregistry.

However, when I try to run $ ./dspace database migrate ignored, I get the exact 
same errors as before.  The dspace.log this time collected more info, and I am 
attaching it here.

What else could I try?
On Monday, February 28, 2022 at 12:22:13 p.m. UTC-4 Tim Donohue wrote:
Hi,

Unfortunately, since you are on such an old version of DSpace (v4), the newer 
DSpace 7 "update-sequences" scripts will not work on your database until you 
successfully upgrade.  Instead, to update sequences on a database that's 
currently compatible with DSpace 4.x, you would need to manually run the 
*older* "update-sequences.sql" that came with DSpace 4.x.  Here it is: 
https://github.com/DSpace/DSpace/blob/dspace-4_x/dspace/etc/postgres/update-sequences.sql

With the migration that is failing...it looks like this is the SQL statement 
that is failing with "ERROR: more than one row returned by a subquery used as 
an expression": 
https://github.com/DSpace/DSpace/blob/dspace-7.2/dspace-api/src/main/resources/org/dspace/storage/rdbms/sqlmigration/postgres/V5.0_2014.09.26__DS-1582_Metadata_For_All_Objects.sql#L74-L82
  (As you may notice the error says it's the statement starting on line 74)

Based on the error, it appears to me that the problem is that the internal 
SELECT on line 78 is returning *multiple values* instead of the expected 
*single value*.  This would mean that somehow your DSpace 4.x database has 
**two different** "dc.title" fields in the "metadatafieldregistry" table.   You 
would need to remove one of them, as *every field must be uniquely named* in 
the "metadatafieldregistry".

Once you remove the duplicate field and run the old "update-sequences.sql", 
hopefully the migration to DSpace 7.x will succeed.

If you run into any other issues, let us know on this list.

Tim




On Tuesday, February 22, 2022 at 11:20:31 PM UTC-6 Night Librarian wrote:
Sorry for the lengthy post!

I'm trying to migrate from 4.0 on Windows to 7.2 on Ubuntu 20.04.3 LTS.  I 
created a virtual machine and followed the instructions from 
https://wiki.lyrasis.org/display/DSDOC7x/Upgrading+DSpace, only to get stuck at 
the database update step :(

First, I imported the pg_dump from the old machine:

$psql --set ON_ERROR_STOP=on dspace < /temp/dspace.sql
====================================================================

Then:

$ ./dspace database info

Database Type: postgres

Database URL: jdbc:postgresql://localhost:5432/dspace

Database Schema: public

Database Username: dspace

Database Software: PostgreSQL version 12.9 (Ubuntu 12.9-0ubuntu0.20.04.1)

Database Driver: PostgreSQL JDBC Driver version 42.2.25

PostgreSQL 'pgcrypto' extension installed/up-to-date? true (version=1.3)

FlywayDB Version: 6.5.7



+-----------+----------------+-----------------------------------------------------+------+--------------+---------+

| Category  | Version        | Description                                      
   | Type | Installed On | State   |

+-----------+----------------+-----------------------------------------------------+------+--------------+---------+

| Versioned | 1.1            | Initial DSpace 1.1 database schema               
   | SQL  |              | Pending |

| Versioned | 1.2            | Upgrade to DSpace 1.2 schema                     
   | SQL  |              | Pending |

| Versioned | 1.3            | Upgrade to DSpace 1.3 schema                     
   | SQL  |              | Pending |

| Versioned | 1.3.9          | Drop constraint for DSpace 1 4 schema            
   | JDBC |              | Pending |

| Versioned | 1.4            | Upgrade to DSpace 1.4 schema                     
   | SQL  |              | Pending |

| Versioned | 1.5            | Upgrade to DSpace 1.5 schema                     
   | SQL  |              | Pending |

| Versioned | 1.5.9          | Drop constraint for DSpace 1 6 schema            
   | JDBC |              | Pending |

| Versioned | 1.6            | Upgrade to DSpace 1.6 schema                     
   | SQL  |              | Pending |

| Versioned | 1.7            | Upgrade to DSpace 1.7 schema                     
   | SQL  |              | Pending |

| Versioned | 1.8            | Upgrade to DSpace 1.8 schema                     
   | SQL  |              | Pending |

| Versioned | 3.0            | Upgrade to DSpace 3.x schema                     
   | SQL  |              | Pending |

| Versioned | 4.0            | Upgrade to DSpace 4.x schema                     
   | SQL  |              | Pending |

| Versioned | 4.9.2015.10.26 | DS-2818 registry update                          
   | SQL  |              | Pending |

| Versioned | 5.0.2014.08.08 | DS-1945 Helpdesk Request a Copy                  
   | SQL  |              | Pending |

| Versioned | 5.0.2014.09.25 | DS 1582 Metadata For All Objects drop constraint 
   | JDBC |              | Pending |

| Versioned | 5.0.2014.09.26 | DS-1582 Metadata For All Objects                 
   | SQL  |              | Pending |

| Versioned | 5.0.2014.11.04 | Enable XMLWorkflow Migration                     
   | JDBC |              | Pending |

| Versioned | 5.6.2016.08.23 | DS-3097                                          
   | SQL  |              | Pending |

| Versioned | 5.7.2017.04.11 | DS-3563 Index metadatavalue resource type id 
column | SQL  |              | Pending |

| Versioned | 5.7.2017.05.05 | DS 3431 Add Policies for BasicWorkflow           
   | JDBC |              | Pending |

| Versioned | 6.0.2015.03.06 | DS 2701 Dso Uuid Migration                       
   | JDBC |              | Pending |

| Versioned | 6.0.2015.03.07 | DS-2701 Hibernate migration                      
   | SQL  |              | Pending |

| Versioned | 6.0.2015.08.31 | DS 2701 Hibernate Workflow Migration             
   | JDBC |              | Pending |

| Versioned | 6.0.2015.09.01 | DS 2701 Enable XMLWorkflow Migration             
   | JDBC |              | Pending |

| Versioned | 6.0.2016.01.03 | DS-3024                                          
   | SQL  |              | Pending |

| Versioned | 6.0.2016.01.26 | DS 2188 Remove DBMS Browse Tables                
   | JDBC |              | Pending |

| Versioned | 6.0.2016.02.25 | DS-3004-slow-searching-as-admin                  
   | SQL  |              | Pending |

| Versioned | 6.0.2016.04.01 | DS-1955 Increase embargo reason                  
   | SQL  |              | Pending |

| Versioned | 6.0.2016.04.04 | DS-3086-OAI-Performance-fix                      
   | SQL  |              | Pending |

| Versioned | 6.0.2016.04.14 | DS-3125-fix-bundle-bitstream-delete-rights       
   | SQL  |              | Pending |

| Versioned | 6.0.2016.05.10 | DS-3168-fix-requestitem item id column           
   | SQL  |              | Pending |

| Versioned | 6.0.2016.07.21 | DS-2775                                          
   | SQL  |              | Pending |

| Versioned | 6.0.2016.07.26 | DS-3277 fix handle assignment                    
   | SQL  |              | Pending |

| Versioned | 6.0.2016.08.23 | DS-3097                                          
   | SQL  |              | Pending |

| Versioned | 6.1.2017.01.03 | DS 3431 Add Policies for BasicWorkflow           
   | JDBC |              | Pending |

| Versioned | 7.0.2017.10.12 | DS-3542-stateless-sessions                       
   | SQL  |              | Pending |

| Versioned | 7.0.2018.04.03 | Upgrade Workflow Policy                          
   | JDBC |              | Pending |

| Versioned | 7.0.2018.04.16 | dspace-entities                                  
   | SQL  |              | Pending |

| Versioned | 7.0.2018.06.07 | DS-3851-permission                               
   | SQL  |              | Pending |

| Versioned | 7.0.2019.05.02 | DS-4239-workflow-xml-migration                   
   | SQL  |              | Pending |

| Versioned | 7.0.2019.06.14 | scripts-and-process                              
   | SQL  |              | Pending |

| Versioned | 7.0.2019.07.31 | Retrieval of name variant                        
   | SQL  |              | Pending |

| Versioned | 7.0.2019.11.13 | relationship type copy left right                
   | SQL  |              | Pending |

| Versioned | 7.0.2020.01.08 | DS-626-statistics-tracker                        
   | SQL  |              | Pending |

| Versioned | 7.0.2020.10.31 | CollectionCommunity Metadata Handle              
   | JDBC |              | Pending |

| Versioned | 7.0.2021.01.22 | Remove basic workflow                            
   | SQL  |              | Pending |

| Versioned | 7.0.2021.02.08 | tilted rels                                      
   | SQL  |              | Pending |

| Versioned | 7.0.2021.03.18 | Move entity type to dspace schema                
   | SQL  |              | Pending |

| Versioned | 7.0.2021.09.24 | Move entity type from item template to 
collection   | SQL  |              | Pending |

| Versioned | 7.0.2021.10.04 | alter collection table drop workflow stem 
columns   | SQL  |              | Pending |

| Versioned | 7.1.2021.10.18 | Fix MDV place after migrating from DSpace 5      
   | SQL  |              | Pending |

+-----------+----------------+-----------------------------------------------------+------+--------------+---------+

NOTE: This database is NOT yet initialized for auto-migrations (via Flyway).

Your database looks to be compatible with DSpace version 4.0

All upgrades *after* version 4.0 will be run during the next migration.

If you'd like to upgrade now, simply run 'dspace database migrate'.

====================================================================

Then, got an error after trying to update sequences:

$psql -U dspace -f 
/temp/DSpace-dspace-7.2/dspace-api/target/classes/org/dspace/storage/rdbms/sqlmigration/postgres/update-sequences.sql
 dspace

<...>
psql:/temp/DSpace-dspace-7.2/dspace-api/target/classes/org/dspace/storage/rdbms/sqlmigration/postgres/update-sequences.sql:36:
 ERROR:  relation "handle_id_seq" does not exist

LINE 1: SELECT setval('handle_id_seq', max(handle_id)) FROM handle;
<...>

====================================================================

Then, tried update-sequences in a different way:

 $./dspace database update-sequences

Running org/dspace/storage/rdbms/sqlmigration/postgres/update-sequences.sql

Caught exception:

org.postgresql.util.PSQLException: ERROR: relation "handle_id_seq" does not 
exist

  Position: 16

        at 
org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2565)

        at 
org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:2297)

        at 
org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:322)

        at org.postgresql.jdbc.PgStatement.executeInternal(PgStatement.java:481)

        at org.postgresql.jdbc.PgStatement.execute(PgStatement.java:401)

        at 
org.postgresql.jdbc.PgStatement.executeWithFlags(PgStatement.java:322)

        at 
org.postgresql.jdbc.PgStatement.executeCachedSql(PgStatement.java:308)

        at 
org.postgresql.jdbc.PgStatement.executeWithFlags(PgStatement.java:284)

        at org.postgresql.jdbc.PgStatement.execute(PgStatement.java:279)

        at 
org.apache.commons.dbcp2.DelegatingStatement.execute(DelegatingStatement.java:194)

        at 
org.apache.commons.dbcp2.DelegatingStatement.execute(DelegatingStatement.java:194)

        at org.dspace.storage.rdbms.DatabaseUtils.main(DatabaseUtils.java:353)

        at 
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

        at 
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

        at 
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

        at java.base/java.lang.reflect.Method.invoke(Method.java:566)

        at 
org.dspace.app.launcher.ScriptLauncher.runOneCommand(ScriptLauncher.java:277)

        at 
org.dspace.app.launcher.ScriptLauncher.handleScript(ScriptLauncher.java:133)

        at org.dspace.app.launcher.ScriptLauncher.main(ScriptLauncher.java:98)

====================================================================

The last thing I did was:

$ ./dspace database migrate ignored

Database URL: jdbc:postgresql://localhost:5432/dspace

Migrating database to latest version AND running previously "Ignored" 
migrations... (Check logs for details)

Migration exception:

java.sql.SQLException: Flyway migration error occurred

        at 
org.dspace.storage.rdbms.DatabaseUtils.updateDatabase(DatabaseUtils.java:775)

        at 
org.dspace.storage.rdbms.DatabaseUtils.updateDatabase(DatabaseUtils.java:662)

        at org.dspace.storage.rdbms.DatabaseUtils.main(DatabaseUtils.java:195)

        at 
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

        at 
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

        at 
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

        at java.base/java.lang.reflect.Method.invoke(Method.java:566)

        at 
org.dspace.app.launcher.ScriptLauncher.runOneCommand(ScriptLauncher.java:277)

        at 
org.dspace.app.launcher.ScriptLauncher.handleScript(ScriptLauncher.java:133)

        at org.dspace.app.launcher.ScriptLauncher.main(ScriptLauncher.java:98)

Caused by: org.flywaydb.core.internal.command.DbMigrate$FlywayMigrateException:

Migration V5.0_2014.09.26__DS-1582_Metadata_For_All_Objects.sql failed

----------------------------------------------------------------------

SQL State  : 21000

Error Code : 0

Message    : ERROR: more than one row returned by a subquery used as an 
expression

Location   : 
org/dspace/storage/rdbms/sqlmigration/postgres/V5.0_2014.09.26__DS-1582_Metadata_For_All_Objects.sql
 
(/dspace/bin/file:/dspace/lib/dspace-api-7.2.jar!/org/dspace/storage/rdbms/sqlmigration/postgres/V5.0_2014.09.26__DS-1582_Metadata_For_All_Objects.sql)

Line       : 74

Statement  : INSERT INTO metadatavalue (resource_id, resource_type_id, 
metadata_field_id, text_value, text_lang, place)

SELECT

community_id AS resource_id,

4 AS resource_type_id,

(select metadata_field_id from metadatafieldregistry where 
metadata_schema_id=(select metadata_schema_id from metadataschemaregistry where 
short_id='dc') and element = 'title' and qualifier is null) AS 
metadata_field_id,

name AS text_value,

null AS text_lang,

0 AS place

FROM community where not name is null



        at 
org.flywaydb.core.internal.command.DbMigrate.doMigrateGroup(DbMigrate.java:369)

        at 
org.flywaydb.core.internal.command.DbMigrate.access$200(DbMigrate.java:54)

        at 
org.flywaydb.core.internal.command.DbMigrate$3.call(DbMigrate.java:282)

        at 
org.flywaydb.core.internal.jdbc.TransactionalExecutionTemplate.execute(TransactionalExecutionTemplate.java:66)

        at 
org.flywaydb.core.internal.command.DbMigrate.applyMigrations(DbMigrate.java:279)

        at 
org.flywaydb.core.internal.command.DbMigrate.migrateGroup(DbMigrate.java:244)

        at 
org.flywaydb.core.internal.command.DbMigrate.access$100(DbMigrate.java:54)

        at 
org.flywaydb.core.internal.command.DbMigrate$2.call(DbMigrate.java:162)

        at 
org.flywaydb.core.internal.command.DbMigrate$2.call(DbMigrate.java:159)

        at 
org.flywaydb.core.internal.database.postgresql.PostgreSQLAdvisoryLockTemplate.execute(PostgreSQLAdvisoryLockTemplate.java:71)

        at 
org.flywaydb.core.internal.database.postgresql.PostgreSQLConnection.lock(PostgreSQLConnection.java:99)

        at 
org.flywaydb.core.internal.schemahistory.JdbcTableSchemaHistory.lock(JdbcTableSchemaHistory.java:140)

        at 
org.flywaydb.core.internal.command.DbMigrate.migrateAll(DbMigrate.java:159)

        at 
org.flywaydb.core.internal.command.DbMigrate.migrate(DbMigrate.java:137)

        at org.flywaydb.core.Flyway$1.execute(Flyway.java:206)

        at org.flywaydb.core.Flyway$1.execute(Flyway.java:158)

        at org.flywaydb.core.Flyway.execute(Flyway.java:527)

        at org.flywaydb.core.Flyway.migrate(Flyway.java:158)

        at 
org.dspace.storage.rdbms.DatabaseUtils.updateDatabase(DatabaseUtils.java:762)

        ... 9 more

Caused by: org.flywaydb.core.internal.sqlscript.FlywaySqlScriptException:

Migration V5.0_2014.09.26__DS-1582_Metadata_For_All_Objects.sql failed

----------------------------------------------------------------------

SQL State  : 21000

Error Code : 0

Message    : ERROR: more than one row returned by a subquery used as an 
expression

Location   : 
org/dspace/storage/rdbms/sqlmigration/postgres/V5.0_2014.09.26__DS-1582_Metadata_For_All_Objects.sql
 
(/dspace/bin/file:/dspace/lib/dspace-api-7.2.jar!/org/dspace/storage/rdbms/sqlmigration/postgres/V5.0_2014.09.26__DS-1582_Metadata_For_All_Objects.sql)

Line       : 74

Statement  : INSERT INTO metadatavalue (resource_id, resource_type_id, 
metadata_field_id, text_value, text_lang, place)

SELECT

community_id AS resource_id,

4 AS resource_type_id,

(select metadata_field_id from metadatafieldregistry where 
metadata_schema_id=(select metadata_schema_id from metadataschemaregistry where 
short_id='dc') and element = 'title' and qualifier is null) AS 
metadata_field_id,

name AS text_value,

null AS text_lang,

0 AS place

FROM community where not name is null



        at 
org.flywaydb.core.internal.sqlscript.DefaultSqlScriptExecutor.handleException(DefaultSqlScriptExecutor.java:274)

        at 
org.flywaydb.core.internal.sqlscript.DefaultSqlScriptExecutor.executeStatement(DefaultSqlScriptExecutor.java:219)

        at 
org.flywaydb.core.internal.sqlscript.DefaultSqlScriptExecutor.execute(DefaultSqlScriptExecutor.java:127)

        at 
org.flywaydb.core.internal.resolver.sql.SqlMigrationExecutor.executeOnce(SqlMigrationExecutor.java:88)

        at 
org.flywaydb.core.internal.resolver.sql.SqlMigrationExecutor.access$000(SqlMigrationExecutor.java:33)

        at 
org.flywaydb.core.internal.resolver.sql.SqlMigrationExecutor$1.call(SqlMigrationExecutor.java:77)

        at 
org.flywaydb.core.internal.resolver.sql.SqlMigrationExecutor$1.call(SqlMigrationExecutor.java:74)

        at 
org.flywaydb.core.internal.database.DefaultExecutionStrategy.execute(DefaultExecutionStrategy.java:28)

        at 
org.flywaydb.core.internal.resolver.sql.SqlMigrationExecutor.execute(SqlMigrationExecutor.java:74)

        at 
org.flywaydb.core.internal.command.DbMigrate.doMigrateGroup(DbMigrate.java:366)

        ... 27 more

Caused by: org.postgresql.util.PSQLException: ERROR: more than one row returned 
by a subquery used as an expression

        at 
org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2565)

        at 
org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:2297)

        at 
org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:322)

        at org.postgresql.jdbc.PgStatement.executeInternal(PgStatement.java:481)

        at org.postgresql.jdbc.PgStatement.execute(PgStatement.java:401)

        at 
org.postgresql.jdbc.PgStatement.executeWithFlags(PgStatement.java:322)

        at 
org.postgresql.jdbc.PgStatement.executeCachedSql(PgStatement.java:308)

        at 
org.postgresql.jdbc.PgStatement.executeWithFlags(PgStatement.java:284)

        at org.postgresql.jdbc.PgStatement.execute(PgStatement.java:279)

        at 
org.apache.commons.dbcp2.DelegatingStatement.execute(DelegatingStatement.java:194)

        at 
org.apache.commons.dbcp2.DelegatingStatement.execute(DelegatingStatement.java:194)

        at 
org.flywaydb.core.internal.jdbc.JdbcTemplate.executeStatement(JdbcTemplate.java:244)

        at 
org.flywaydb.core.internal.sqlscript.ParsedSqlStatement.execute(ParsedSqlStatement.java:111)

        at 
org.flywaydb.core.internal.sqlscript.DefaultSqlScriptExecutor.executeStatement(DefaultSqlScriptExecutor.java:207)

        ... 35 more

 ====================================================================

Dspace.log after migration attempt shows this:


INFO  unknown unknown org.dspace.storage.rdbms.DatabaseUtils @ Loading Flyway 
DB migrations from: classpath:org/dspace/storage/rdbms/sqlmigration/postgres, 
classpath:org/dspace/storage/rdbms/migration, 
classpath:org/dspace/storage/rdbms/xmlworkflow

INFO  unknown unknown org.flywaydb.core.internal.database.DatabaseFactory @ 
Database: jdbc:postgresql://localhost:5432/dspace (PostgreSQL 12.9)

INFO  unknown unknown 
org.flywaydb.core.internal.schemahistory.JdbcTableSchemaHistory @ Creating 
Schema History table "public"."schema_version" with baseline ...

INFO  unknown unknown org.flywaydb.core.internal.command.DbBaseline @ 
Successfully baselined schema with version: 4.0

INFO  unknown unknown org.dspace.storage.rdbms.DatabaseUtils @ Pending DSpace 
database schema migrations:

INFO  unknown unknown org.dspace.storage.rdbms.DatabaseUtils @      
4.9.2015.10.26 DS-2818 registry update SQL PENDING

INFO  unknown unknown org.dspace.storage.rdbms.DatabaseUtils @      
5.0.2014.08.08 DS-1945 Helpdesk Request a Copy SQL PENDING

INFO  unknown unknown org.dspace.storage.rdbms.DatabaseUtils @      
5.0.2014.09.25 DS 1582 Metadata For All Objects drop constraint JDBC PENDING

INFO  unknown unknown org.dspace.storage.rdbms.DatabaseUtils @      
5.0.2014.09.26 DS-1582 Metadata For All Objects SQL PENDING

INFO  unknown unknown org.dspace.storage.rdbms.DatabaseUtils @      
5.0.2014.11.04 Enable XMLWorkflow Migration JDBC PENDING

INFO  unknown unknown org.dspace.storage.rdbms.DatabaseUtils @      
5.6.2016.08.23 DS-3097 SQL PENDING

INFO  unknown unknown org.dspace.storage.rdbms.DatabaseUtils @      
5.7.2017.04.11 DS-3563 Index metadatavalue resource type id column SQL PENDING

INFO  unknown unknown org.dspace.storage.rdbms.DatabaseUtils @      
5.7.2017.05.05 DS 3431 Add Policies for BasicWorkflow JDBC PENDING

INFO  unknown unknown org.dspace.storage.rdbms.DatabaseUtils @      
6.0.2015.03.06 DS 2701 Dso Uuid Migration JDBC PENDING

INFO  unknown unknown org.dspace.storage.rdbms.DatabaseUtils @      
6.0.2015.03.07 DS-2701 Hibernate migration SQL PENDING

INFO  unknown unknown org.dspace.storage.rdbms.DatabaseUtils @      
6.0.2015.08.31 DS 2701 Hibernate Workflow Migration JDBC PENDING

INFO  unknown unknown org.dspace.storage.rdbms.DatabaseUtils @      
6.0.2015.09.01 DS 2701 Enable XMLWorkflow Migration JDBC PENDING

INFO  unknown unknown org.dspace.storage.rdbms.DatabaseUtils @      
6.0.2016.01.03 DS-3024 SQL PENDING

INFO  unknown unknown org.dspace.storage.rdbms.DatabaseUtils @      
6.0.2016.01.26 DS 2188 Remove DBMS Browse Tables JDBC PENDING

INFO  unknown unknown org.dspace.storage.rdbms.DatabaseUtils @      
6.0.2016.02.25 DS-3004-slow-searching-as-admin SQL PENDING

INFO  unknown unknown org.dspace.storage.rdbms.DatabaseUtils @      
6.0.2016.04.01 DS-1955 Increase embargo reason SQL PENDING

INFO  unknown unknown org.dspace.storage.rdbms.DatabaseUtils @      
6.0.2016.04.04 DS-3086-OAI-Performance-fix SQL PENDING

INFO  unknown unknown org.dspace.storage.rdbms.DatabaseUtils @      
6.0.2016.04.14 DS-3125-fix-bundle-bitstream-delete-rights SQL PENDING

INFO  unknown unknown org.dspace.storage.rdbms.DatabaseUtils @      
6.0.2016.05.10 DS-3168-fix-requestitem item id column SQL PENDING

INFO  unknown unknown org.dspace.storage.rdbms.DatabaseUtils @      
6.0.2016.07.21 DS-2775 SQL PENDING

INFO  unknown unknown org.dspace.storage.rdbms.DatabaseUtils @      
6.0.2016.07.26 DS-3277 fix handle assignment SQL PENDING

INFO  unknown unknown org.dspace.storage.rdbms.DatabaseUtils @      
6.0.2016.08.23 DS-3097 SQL PENDING

INFO  unknown unknown org.dspace.storage.rdbms.DatabaseUtils @      
6.1.2017.01.03 DS 3431 Add Policies for BasicWorkflow JDBC PENDING

INFO  unknown unknown org.dspace.storage.rdbms.DatabaseUtils @      
7.0.2017.10.12 DS-3542-stateless-sessions SQL PENDING

INFO  unknown unknown org.dspace.storage.rdbms.DatabaseUtils @      
7.0.2018.04.03 Upgrade Workflow Policy JDBC PENDING

INFO  unknown unknown org.dspace.storage.rdbms.DatabaseUtils @      
7.0.2018.04.16 dspace-entities SQL PENDING

INFO  unknown unknown org.dspace.storage.rdbms.DatabaseUtils @      
7.0.2018.06.07 DS-3851-permission SQL PENDING

INFO  unknown unknown org.dspace.storage.rdbms.DatabaseUtils @      
7.0.2019.05.02 DS-4239-workflow-xml-migration SQL PENDING

INFO  unknown unknown org.dspace.storage.rdbms.DatabaseUtils @      
7.0.2019.06.14 scripts-and-process SQL PENDING

INFO  unknown unknown org.dspace.storage.rdbms.DatabaseUtils @      
7.0.2019.07.31 Retrieval of name variant SQL PENDING

INFO  unknown unknown org.dspace.storage.rdbms.DatabaseUtils @      
7.0.2019.11.13 relationship type copy left right SQL PENDING

INFO  unknown unknown org.dspace.storage.rdbms.DatabaseUtils @      
7.0.2020.01.08 DS-626-statistics-tracker SQL PENDING

INFO  unknown unknown org.dspace.storage.rdbms.DatabaseUtils @      
7.0.2020.10.31 CollectionCommunity Metadata Handle JDBC PENDING

INFO  unknown unknown org.dspace.storage.rdbms.DatabaseUtils @      
7.0.2021.01.22 Remove basic workflow SQL PENDING

INFO  unknown unknown org.dspace.storage.rdbms.DatabaseUtils @      
7.0.2021.02.08 tilted rels SQL PENDING

INFO  unknown unknown org.dspace.storage.rdbms.DatabaseUtils @      
7.0.2021.03.18 Move entity type to dspace schema SQL PENDING

INFO  unknown unknown org.dspace.storage.rdbms.DatabaseUtils @      
7.0.2021.09.24 Move entity type from item template to collection SQL PENDING

INFO  unknown unknown org.dspace.storage.rdbms.DatabaseUtils @      
7.0.2021.10.04 alter collection table drop workflow stem columns SQL PENDING

INFO  unknown unknown org.dspace.storage.rdbms.DatabaseUtils @      
7.1.2021.10.18 Fix MDV place after migrating from DSpace 5 SQL PENDING

INFO  unknown unknown org.flywaydb.core.internal.command.DbValidate @ 
Successfully validated 51 migrations (execution time 00:00.119s)

INFO  unknown unknown org.flywaydb.core.internal.command.DbMigrate @ Current 
version of schema "public": 4.0

WARN  unknown unknown org.flywaydb.core.internal.command.DbMigrate @ outOfOrder 
mode is active. Migration of schema "public" may not be reproducible.

INFO  unknown unknown org.flywaydb.core.internal.command.DbMigrate @ Migrating 
schema "public" to version 4.9.2015.10.26 - DS-2818 registry update

INFO  unknown unknown org.flywaydb.core.internal.command.DbMigrate @ Migrating 
schema "public" to version 5.0.2014.08.08 - DS-1945 Helpdesk Request a Copy

INFO  unknown unknown org.flywaydb.core.internal.command.DbMigrate @ Migrating 
schema "public" to version 5.0.2014.09.25 - DS 1582 Metadata For All Objects 
drop constraint

INFO  unknown unknown org.flywaydb.core.internal.command.DbMigrate @ Migrating 
schema "public" to version 5.0.2014.09.26 - DS-1582 Metadata For All Objects

ERROR unknown unknown org.flywaydb.core.internal.command.DbMigrate @ Migration 
of schema "public" to version 5.0.2014.09.26 - DS-1582 Metadata For All Objects 
failed! Changes successfully rolled

INFO  unknown unknown 
org.springframework.cache.ehcache.EhCacheManagerFactoryBean @ Shutting down 
EhCache CacheManager 'org.dspace.services'

 ====================================================================
I read previous posts about both "Migration 
V5.0_2014.09.26__DS-1582_Metadata_For_All_Objects.sql failed" and "relation 
"handle_id_seq" does not exist" errors, but reverting to previous snapshots and 
retrying the database migration still doesn't work for me yet.  Your 
suggestions will be most welcome!

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