简介
目前从PostgreSQL迁移到YashanDB后，需要进行数据校验。下面给出user1模式从PostgreSQL迁移到YashanDB进行数据行数比对的示例。
详情
获取PostgreSQL精确行数
创建table_count，用于存储行数（建议：使用现有的迁移模式user1，并把table_count创建在user1用户下）
create table user1.table_count (owner varchar(200),table_name varchar(200),num_rows int);
获取user1模式下的所有表的行数
DO $$ DECLARE one_row record; stmt varchar(200); num_rows int; BEGIN EXECUTE 'truncate table table_count'; FOR one_row IN (select schemaname, tablename from pg_tables where upper(schemaname)=upper('user1') and upper(tablename)!=upper('table_count')) loop stmt := 'select count(*) from ' || one_row.schemaname || '.' || one_row.tablename || ''; raise notice '%', stmt; EXECUTE stmt into num_rows; raise notice '%', num_rows; insert into table_count values(upper(one_row.schemaname), upper(one_row.tablename), num_rows); END loop; commit; END $$;
获取YashanDB精确行数
从PostgreSQL迁移到YashanDB迁移user1模式，迁移完成后可以创建table_count ，用于存储行数（建议：创建新的用户db_yashan，并把table_count创建在db_yashan用户下）
create table db_yashan.table_count (owner varchar(200),table_name varchar(200),num_rows int);
获取user1用户下的所有表的行数
declare
v_owner VARCHAR2(100);
v_tabname VARCHAR2(100);
stmt VARCHAR2(200);
num_rows number;
begin
EXECUTE IMMEDIATE 'truncate table db_yashan.table_count';
for rec in (select owner,table_name from dba_tables where owner=upper('user1') and tablename!=upper('table_count') order by 1, 2)
loop
select rec.owner,rec.table_name into v_owner,v_tabname from dual;
stmt := 'select count(*) from "' || v_owner || '"."' || v_tabname || '"';
EXECUTE IMMEDIATE stmt INTO num_rows;
insert into db_yashan.table_count values(v_owner,v_tabname,num_rows);
end loop;
end;
/
对比PostgreSQL和YashanDB的精确行数
SELECT
owner,
table_name,
p_num_rows,
y_num_rows
FROM
(
SELECT
nvl(p.owner, y.owner) owner,
nvl(p.table_name, y.table_name) table_name,
p.num_rows p_num_rows,
y.num_rows y_num_rows
FROM
(
SELECT
owner,
table_name,
num_rows
FROM
user1.table_count) p
FULL OUTER JOIN
(
SELECT
owner,
table_name,
num_rows
FROM
db_yashan.table_count) y
ON
p.owner = y.owner
AND p.table_name = y.table_name
ORDER BY
p.owner,
p.table_name
)
WHERE
nvl(p_num_rows, 999999999999999999999999999999) != nvl(y_num_rows, 999999999999999999999999999999)
;
