I encounter an optimisation problem and I can't figure out why my query is so slow.

In production when searching for document.name the application takes about 4 minutes when there are no results and without IDX_DOC_NAME_UPPER. With IDX_DOC_NAME_UPPER it is variable from 40s to 2m. In sqlplus it takes about 3-4s with index and without 8-9s.

DOCUMENTS contains about 2M records and ACTIVITIES 7M records.

DB SCHEMA

-- DOCUMENTS
CREATE TABLE DOCUMENTS
(
    ID          NUMBER(16) PRIMARY KEY,
    NAME        VARCHAR(1024) NOT NULL,
    DOC_SIZE    NUMBER(16)    NOT NULL,
    CREATED     TIMESTAMP     NOT NULL
);
CREATE INDEX IDX_DOC_NAME_UPPER ON DOCUMENTS (UPPER(NAME));

-- USERS
CREATE TABLE USERS
(
    ID    NUMBER(16) PRIMARY KEY,
    CNAME VARCHAR(256) NOT NULL
    --others, removed for brevity
);

-- ACTIVITIES
CREATE TABLE ACTIVITIES
(
    ID     NUMBER(16) PRIMARY KEY,
    USR_ID NUMBER(16) references USERS (ID) NOT NULL,
    DOC_ID NUMBER(16) references DOCUMENTS (ID),
    PRT_ID NUMBER(16) references USERS (ID) NOT NULL
    --others, removed for brevity
);
CREATE INDEX IDX_ACT_USR_ID ON ACTIVITIES (USR_ID);
CREATE INDEX IDX_ACT_DOC_ID ON ACTIVITIES (DOC_ID);

-- LOGS
CREATE VIEW V_LOGS AS
SELECT CNAME,
       ACTIVITIES.USR_ID,
       PRT_ID,
       DOC_ID
       --others, removed for brevity
FROM ACTIVITIES,
     USERS
WHERE USERS.ID = ACTIVITIES.USR_ID;

ENTITIES

@Data
@Entity
@NoArgsConstructor
@Table(name = "USERS")
@SequenceGenerator(allocationSize = 1, name = "USERS_ID", sequenceName = "USERS_ID")
public class User {
    @Id
    @Column(name = "ID", nullable = false)
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "USERS_ID")
    private Long id;

    @NotNull
    @Column(name = "CNAME", nullable = false, length = 256)
    private String cname;
}

@Entity
@Getter
@Immutable
@Table(name = "V_LOGS")
public class LogsView {

    @Id
    @Column(name = "USR_ID", nullable = false)
    private long usrId;

    @Column(name = "PRT_ID", nullable = false)
    private long prtId;

    @Column(name = "DOC_ID")
    private Long docId;

    @ManyToOne
    @JoinColumn(name = "USR_ID",
            nullable = false,
            insertable = false,
            updatable = false)
    private User user;

    @ManyToOne
    @JoinColumn(name = "PRT_ID",
            nullable = false,
            insertable = false,
            updatable = false)
    private User partner;

    @ManyToOne
    @JoinColumn(name = "DOC_ID",
            insertable = false,
            updatable = false)
    private Document document;

    //others, removed for brevity
}

@Data
@Entity
@NoArgsConstructor
@AllArgsConstructor
@Table(name = "DOCUMENTS")
@SequenceGenerator(allocationSize = 1, name = "DOCUMENTS_ID", sequenceName = "DOCUMENTS_ID")
public class Document {
    @Id
    @Column(name = "ID", nullable = false)
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "DOCUMENTS_ID")
    private Long id;

    @Column(name = "NAME", nullable = false, length = 1024)
    private String name;

    @Column(name = "DOC_SIZE", nullable = false)
    private long size;

    @Temporal(TemporalType.TIMESTAMP)
    @Column(name = "CREATED", nullable = false)
    private Date created;

    //others, removed for brevity
}

SPECIFICATION

@RequiredArgsConstructor
public class LogsSpecification implements Specification<LogsView> {
    private final List<SimpleFilter> filters;

    @Override
    public Predicate toPredicate(Root<LogsView> root,
                                 CriteriaQuery<?> criteriaQuery,
                                 CriteriaBuilder criteriaBuilder) {
        if (CollectionUtils.isEmpty(filters)) return null;

        Predicate[] predicates = filters.stream()
                .filter(Objects::nonNull)
                .map(filter -> getPredicate(filter, root, criteriaBuilder))
                .toArray(Predicate[]::new);

        return criteriaBuilder.and(predicates);
    }

    private Predicate getPredicate(SimpleFilter filter,
                                   Root<LogsView> root,
                                   CriteriaBuilder builder) {
        Objects.requireNonNull(filter.getName());
        Predicate predicate;
        String[] keys = filter.getName().split("\\.");
        if (filter.getPredicate() == LIKE) {
            predicate = builder.like(
                    builder.upper(PredicateUtils.getChildPath(root, keys)),
                    ("%" + filter.getValue() + "%").toUpperCase());
        } else {
            predicate = builder.equal(
                    PredicateUtils.getChildPath(root, keys),
                    filter.getValue());
        }
        //others, removed for brevity

        return predicate;
    }
}

REPOSITORY

@Repository
public interface LogsRepository extends ReadOnlyRepository<LogsView, Long>, JpaSpecificationExecutor<Logs> {}

SERVICE

@Service
@RequiredArgsConstructor
public class LogsService {
    private final LogsRepository logsRepository;
    private final ObjectMapper mapper;
    private final Pattern pattern = Pattern.compile("-?\\d+(\\.\\d+)?");

    public Page<LogsDto> paginated(String name, String value) {
        var type = isNumeric(value) ? SimpleFilter.PredicateType.EQUAL : SimpleFilter.PredicateType.LIKE;
        var filter = new SimpleFilter(name, value, type);
        return logsRepository
                .findAll(new LogsSpecification(List.of(filter)), Pageable.ofSize(10))
                .map(en -> mapper.convertValue(en, LogsDto.class));
    }


    private boolean isNumeric(String strNum) {
        return strNum != null && pattern.matcher(strNum).matches();
    }
}

QUERY GENERATED

-- Hibernate: 
-- executing 5 JDBC statements;
select *
from (select * -- removed for brevity
      from v_logs v_logs0_
               cross join documents document1_
      where v_logs0_.doc_id = document1_.id
        and (
          upper(document1_.name) like ?
          )
        and (
              v_logs0_.usr_id in (4, 72, 76, 123, 147, 199, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
          )
        and v_logs0_.usr_id <> 1
      order by v_logs0_.usr_id asc)
where rownum <= ?

Without document.name filter, page 10

1.228738106 seconds

With document.name filter, page 10 and results

2.900642325 seconds

With document.name filter, page 10 and no results

Without IDX_DOC_NAME_UPPER: 240.123813697 seconds, sqlpus: 8-9 seconds
With IDX_DOC_NAME_UPPER: 110.123813697(not stable), seconds sqlpus: 3-4 seconds

SQL FIDDLE

View Execution Plan

CONFIGURATION

• Database: Oracle 19c
• Jdk: 11
• Ojdbc8: 21.3.0
• SpringBoot: 2.6.4
• Hibernate: 5.6.5.Final

I recreated a simple application with the code structure, you can find it at this link: demo-oracle-slow.

Thanks