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Após vários testes, conclui que não é recomendado utilizar o parâmetro TABLE_EXISTS_ACTION=APPEND, devido às restrições de integridade que são impostas pela regra de negócio do cliente. Para este parâmetro trabalhar corretamente, observei que é preciso checar as dependências das tabelas envolvidas, caso contrário, vai ocorrer o erro ORA-0001: unique constraint violated.
APPLICANTS LAST_NAME, FIRST_NAME, APPLICATION_DATE, JOB_DESIRED, SALARY_DESIRED values Brown , Jackson , to_date 01-01-2005 12 00 00 , dd-mm-yyyy hh24 mi ss , IT_CNTR2 , 70113. APPLICANTS LAST_NAME, FIRST_NAME, APPLICATION_DATE, JOB_DESIRED, SALARY_DESIRED values Carrington , Joan , to_date 01-01-2005 12 00 00 , dd-mm-yyyy hh24 mi ss , IT_CNTR2 , 91919.
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O parâmetro TABLE_EXISTS_ACTION do impdp: Como usá-lo para importar e atualizar tabelas no banco de dados ARTIGO EXCLUSIVO
No artigo de hoje vou falar sobre o parâmetro TABLE_EXISTS_ACTION do impdp, também vou criar um exemplo prático para que vocês entendam melhor o conceito.
Este parâmetro deve ser usado em conjunto com o parâmetro TABLES, que especifica as tabelas que serão importadas. Este parâmetro define qual ação tomará o Data Pump quando encontrar uma tabela que já existe no banco de dados.
O parâmetro pode ter os seguintes valores:
- SKIP – nenhuma ação é tomada, ignora a(s) tabela(s) existente(s).
- APPEND – novas linhas serão acrescentadas a tabela existente.
- TRUNCATE – apaga as linhas da(s) tabela(s), em seguida, efetua a carga dos dados.
- REPLACE – substitui a(s) tabela(s) existente(s); implicitamente, é executado os comandos DROP TABLE e CREATE TABLE, depois é feito a carga dos dados.
PASSO A PASSO
Passo 1 – Criando o HREX, importando tabelas do HR para o HREX:
CREATE USER HREX IDENTIFIED BY HREX DEFAULT TABLESPACE USERS TEMPORARY TABLESPACE TEMP; Processando o tipo de objeto DATABASE_EXPORT/SCHEMA/TABLE/TABLE_DATA . . importou "HREX"."COUNTRIES" 6.367 KB 25 linhas . . importou "HREX"."DEPARTMENTS" 7.007 KB 27 linhas . . importou "HREX"."EMPLOYEES" 16.81 KB 107 linhas . . importou "HREX"."JOB_HISTORY" 7.054 KB 10 linhas . . importou "HREX"."JOBS" 6.992 KB 19 linhas . . importou "HREX"."LOCATIONS" 8.273 KB 23 linhas . . importou "HREX"."REGIONS" 5.476 KB 4 linhas Processando o tipo de objeto DATABASE_EXPORT/SCHEMA/ TABLE/GRANT/OWNER_GRANT/OBJECT_GRANT Processando o tipo de objeto DATABASE_EXPORT/SCHEMA/ TABLE/COMMENTPasso 2 – Inserindo novas linhas nas tabelas do HR:
----- -- Listing 3.2: Add new Jobs, Departments, and Employees ----- INSERT INTO hr.departments (department_id, department_name, manager_id, location_id) VALUES (280, 'Science Fiction Writers', 108, 1500); INSERT INTO hr.jobs (job_id, job_title, min_salary, max_salary) VALUES ('EDITOR', 'Science Fiction Editor', 100000, 199999); INSERT INTO hr.jobs (job_id, job_title, min_salary, max_salary) VALUES ('WRITER-1', 'Science Fiction Writer 1', 5000, 29999); COMMIT; INSERT INTO hr.employees ( employee_id, first_name, last_name, email, phone_number, hire_date, job_id, salary, commission_pct, manager_id, department_id ) VALUES ( 901, 'John', 'Campbell', '[email protected]', '212-555-1212', TO_DATE('02/08/1943', 'MM/DD/YYYY'), 'EDITOR', 110000, NULL, 100, 280 ); INSERT INTO hr.employees ( employee_id, first_name, last_name, email, phone_number, hire_date, job_id, salary, commission_pct, manager_id, department_id ) VALUES ( 902, 'Isaac', 'Asimov', '[email protected]', '212-555-1313', TO_DATE('01/01/1949', 'MM/DD/YYYY'), 'WRITER-1', 5000, NULL, 901, 280 ); COMMIT; ----- -- Listing 3.3: Sample transactions: -- 1.) Update salaries and department IDs for selected employees ----- UPDATE hr.employees SET salary = salary * 1.05 WHERE employee_id >= 902; COMMIT;Passo 3 – Criando tabela HR.APPLICANTS:
----- -- Listing 3.6: Create a new table (HR.APPLICANTS) ----- DROP TABLE hr.applicants CASCADE CONSTRAINTS; create table HR.APPLICANTS ( applicant_id NUMBER(5) NOT NULL, last_name VARCHAR2(24) NOT NULL, first_name VARCHAR2(24) NOT NULL, middle_initial VARCHAR2(1), gender VARCHAR2(1), application_date DATE NOT NULL, job_desired VARCHAR2(10) NOT NULL, salary_desired NUMBER(10,2) NOT NULL, added_on DATE DEFAULT SYSDATE NOT NULL, added_by VARCHAR2(12) NOT NULL, changed_on DATE DEFAULT SYSDATE NOT NULL, changed_by VARCHAR2(12) NOT NULL ) TABLESPACE EXAMPLE PCTFREE 10 PCTUSED 40 INITRANS 1 STORAGE ( INITIAL 64K MINEXTENTS 1 MAXEXTENTS UNLIMITED ); -- Comments COMMENT ON TABLE hr.applicants IS 'Controls domain of Applicants, i.e. persons who have applied for an employment opportunity'; COMMENT ON COLUMN hr.applicants.applicant_id IS 'Unique identifier for an Applicant'; COMMENT ON COLUMN hr.applicants.last_name IS 'Applicant Last Name'; COMMENT ON COLUMN hr.applicants.first_name IS 'Applicant First Name'; COMMENT ON COLUMN hr.applicants.middle_initial IS 'Applicant Middle Initial'; COMMENT ON COLUMN hr.applicants.gender IS 'Applicant Gender'; COMMENT ON COLUMN hr.applicants.application_date IS 'Application Date'; COMMENT ON COLUMN hr.applicants.job_desired IS 'Job Applied For'; COMMENT ON COLUMN hr.applicants.salary_desired IS 'Desired Salary'; COMMENT ON COLUMN hr.applicants.added_on IS 'Added On'; COMMENT ON COLUMN hr.applicants.added_by IS 'Added By'; COMMENT ON COLUMN hr.applicants.changed_on IS 'Last Updated On'; COMMENT ON COLUMN hr.applicants.changed_by IS 'Last Updated By'; -- Create indexes and constraints CREATE UNIQUE INDEX hr.applicants_pk_idx ON hr.applicants(applicant_id) TABLESPACE EXAMPLE PCTFREE 10 INITRANS 2 MAXTRANS 255 STORAGE ( INITIAL 64K MINEXTENTS 1 MAXEXTENTS UNLIMITED ); ALTER TABLE hr.applicants ADD CONSTRAINT applicants_pk PRIMARY KEY (applicant_id); CREATE INDEX hr.applicants_last_name_idx ON hr.applicants(last_name) TABLESPACE EXAMPLE PCTFREE 10 INITRANS 2 MAXTRANS 255 STORAGE ( INITIAL 64K MINEXTENTS 1 MAXEXTENTS UNLIMITED ); -- Create/Recreate check constraints ALTER TABLE hr.applicants ADD CONSTRAINT applicant_gender_ck CHECK ((gender IN('M', 'F') or gender IS NULL)); -- Create sequence DROP SEQUENCE hr.seq_applicants; CREATE SEQUENCE hr.seq_applicants MINVALUE 1 MAXVALUE 999999999999999999999999999 START WITH 1 INCREMENT BY 1 CACHE 3; -- Create INSERT/UPDATE row-level trigger CREATE OR REPLACE TRIGGER hr.tr_briu_applicants BEFORE INSERT OR UPDATE ON hr.applicants FOR EACH ROW DECLARE entry_id NUMBER := 0; BEGIN IF INSERTING THEN BEGIN SELECT hr.seq_applicants.NEXTVAL INTO entry_id FROM DUAL; :new.applicant_id := entry_id; :new.added_on := SYSDATE; :new.added_by := DBMS_STANDARD.LOGIN_USER; :new.changed_on := SYSDATE; :new.changed_by := DBMS_STANDARD.LOGIN_USER; END; ELSIF UPDATING THEN BEGIN :new.changed_on := SYSDATE; :new.changed_by := DBMS_STANDARD.LOGIN_USER; END; END IF; END TR_BRIU_APPLICANTS; / -- Create a first set of applicants insert into HR.APPLICANTS (LAST_NAME, FIRST_NAME, APPLICATION_DATE, JOB_DESIRED, SALARY_DESIRED) values ('Aniston', 'Seth', to_date('01-01-2005 12:00:00', 'dd-mm-yyyy hh24:mi:ss'), 'IT_CNTR2', 88017.94); insert into HR.APPLICANTS (LAST_NAME, FIRST_NAME, APPLICATION_DATE, JOB_DESIRED, SALARY_DESIRED) values ('Niven', 'Ray', to_date('01-01-2005 12:00:00', 'dd-mm-yyyy hh24:mi:ss'), 'IT_CNTR1', 82553.39); insert into HR.APPLICANTS (LAST_NAME, FIRST_NAME, APPLICATION_DATE, JOB_DESIRED, SALARY_DESIRED) values ('Brown', 'Jackson', to_date('01-01-2005 12:00:00', 'dd-mm-yyyy hh24:mi:ss'), 'IT_CNTR2', 70113.04); insert into HR.APPLICANTS (LAST_NAME, FIRST_NAME, APPLICATION_DATE, JOB_DESIRED, SALARY_DESIRED) values ('Murdock', 'Charlton', to_date('01-01-2005 12:00:00', 'dd-mm-yyyy hh24:mi:ss'), 'IT_CNTR2', 70389.16); COMMIT; ----- -- Listing 3.7: Create a second set of applicants ----- insert into HR.APPLICANTS (LAST_NAME, FIRST_NAME, APPLICATION_DATE, JOB_DESIRED, SALARY_DESIRED) values ('Sandler', 'Joanna', to_date('01-01-2005 12:00:00', 'dd-mm-yyyy hh24:mi:ss'), 'IT_CNTR1', 56205.25); insert into HR.APPLICANTS (LAST_NAME, FIRST_NAME, APPLICATION_DATE, JOB_DESIRED, SALARY_DESIRED) values ('Callow', 'Ramsey', to_date('01-01-2005 12:00:00', 'dd-mm-yyyy hh24:mi:ss'), 'IT_CNTR1', 90966.42); insert into HR.APPLICANTS (LAST_NAME, FIRST_NAME, APPLICATION_DATE, JOB_DESIRED, SALARY_DESIRED) values ('Skerritt', 'Rade', to_date('01-01-2005 12:00:00', 'dd-mm-yyyy hh24:mi:ss'), 'IT_CNTR2', 44394.27); insert into HR.APPLICANTS (LAST_NAME, FIRST_NAME, APPLICATION_DATE, JOB_DESIRED, SALARY_DESIRED) values ('MacLachlan', 'Walter', to_date('01-01-2005 12:00:00', 'dd-mm-yyyy hh24:mi:ss'), 'IT_CNTR3', 97292.06); COMMIT; ----- -- Listing 3.11: Create a third set of applicants ----- insert into HR.APPLICANTS (LAST_NAME, FIRST_NAME, APPLICATION_DATE, JOB_DESIRED, SALARY_DESIRED) values ('Winwood', 'Chloe', to_date('01-01-2005 12:00:00', 'dd-mm-yyyy hh24:mi:ss'), 'IT_CNTR3', 57301.55); insert into HR.APPLICANTS (LAST_NAME, FIRST_NAME, APPLICATION_DATE, JOB_DESIRED, SALARY_DESIRED) values ('King', 'Clint', to_date('01-01-2005 12:00:00', 'dd-mm-yyyy hh24:mi:ss'), 'IT_CNTR2', 50291.11); insert into HR.APPLICANTS (LAST_NAME, FIRST_NAME, APPLICATION_DATE, JOB_DESIRED, SALARY_DESIRED) values ('Carrington', 'Joan', to_date('01-01-2005 12:00:00', 'dd-mm-yyyy hh24:mi:ss'), 'IT_CNTR2', 91919.56); insert into HR.APPLICANTS (LAST_NAME, FIRST_NAME, APPLICATION_DATE, JOB_DESIRED, SALARY_DESIRED) values ('Tyson', 'Hex', to_date('01-01-2005 12:00:00', 'dd-mm-yyyy hh24:mi:ss'), 'IT_CNTR1', 56582.30); COMMIT;Passo 4 – Importando tabela DEPARTMENTS:
Comparando a tabela dos esquemas HR e HREX, nota-se a ausência do departamento 280 na tabela HREX.DEPARTMENTS.
Para que as tabelas fiquem iguais, vamos substituir a tabela do esquema HREX pela tabela do HR.
Passo 5 – Importando tabela APPLICANTS:
Neste passo, vamos importar a tabela APPLICANTS do esquema HR para o HREX, através do “comando” TRUNCATE. Quando utilizamos esta opção, o Data Pump apaga todas as linhas da tabela e “popula” ela com os dados do ambiente de origem.
Passo 6 – Importando tabelas EMPLOYEES, APPLICANTS, APPLICANTS2:
Vamos importar as tabelas EMPLOYEES, APPLICANTS e APPLICANTS2 do esquema HR para o esquema HREX. As tabelas que já existem no esquema HREX não serão importadas, as outras tabelas sim. Para exemplificar, criei a tabela HR.APPLICANTS2.
Conclusão
Após vários testes, conclui que não é recomendado utilizar o parâmetro TABLE_EXISTS_ACTION=APPEND, devido às restrições de integridade que são impostas pela regra de negócio do cliente. Para este parâmetro trabalhar corretamente, observei que é preciso checar as dependências das tabelas envolvidas, caso contrário, vai ocorrer o erro ORA-0001: unique constraint violated.
Referências
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Passo 1 – Criando o HREX, importando tabelas do HR para o HREX:
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Reviews for "The Forgotten Curse: Exploring Isax Tower's Dark History"
- John - 1/5
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- David - 1/5
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