本文主要向大家介绍了Oracle数据库之批量清除一个表的数据，TB级别数据，通过具体的内容向大家展现，希望对大家学习Oracle数据库有所帮助。

有个需求，要求清理8TB的数据，只保留一个月的数据，现有数据量由2010年至2018年底都需要清除，因此写了通用的该清除脚本。该表为没有分区的含有BLOB的大表，一共由三列，file_no,BLOB,还有create_time列，其中file_no为主键，create_time非空。

脚本如下：create or replace procedure proc_batch_delete(PI_table_name in varchar2, -- table name which will delete dataPI_where_condition in varchar2,  -- delete sql conditionPI_thread_count in varchar2,      -- thread number of the sql which use parallel hintPI_commit_count in varchar2) is   -- per delete count and commit countv_delete integer;v_sql varchar2(2000);begindbms_output.put_line('Delete table is ' || PI_table_name || ';');dbms_output.put_line('Where condition is ' || PI_where_condition || ';');dbms_output.put_line('Number of threads is ' || to_char(PI_thread_count) || ';');dbms_output.put_line('Commit count is  ' || to_char(PI_commit_count) || ';');dbms_output.put_line('Now start to batch delete. Timestamp is ' || to_char(sysdate, 'yyyy-mm-dd hh24:mi:ss'));

v_delete := 0;

execute immediate 'alter session enable parallel dml';

v_sql := 'delete /+ parallel('||PI_table_name || ' ' || PI_thread_count ||')/ from ' || PI_table_name ||' where '|| PI_where_condition || 'and rownum <= ' || PI_commit_count;  dbms_output.put_line('Sql is ' || v_sql);

while 1=1 loopEXECUTE IMMEDIATE v_sql;      if SQL%NOTFOUND then exit;      else           v_delete:=v_delete + SQL%ROWCOUNT;      end if;      commit; dbms_output.put_line('already deleted :' || to_char(v_delete) ||'.Timestamp is' || to_char(sysdate, 'yyyy-mm-dd hh24:mi:ss'));    end loop;    commit;

dbms_output.put_line('End to batch delete. Timestamp is ' || to_char(sysdate, 'yyyy-mm-dd hh24:mi:ss'));

end proc_batch_delete;

1.该图

2.执行语句

3.输入值

4.显示值pi_table_name 需要删除数据的表名pi_where_condition 选择条件pi_thread_count并发线程数 pi_commit_count 每次删除和提交事务数量

本文由职坐标整理并发布，希望对同学们学习Oracle有所帮助，更多内容请关注职坐标数据库Oracle数据库频道！