使用创建分表存储过程
set @field_list =' `syslog_id` int(11) NOT NULL AUTO_INCREMENT, `create_user` varchar(32) DEFAULT NULL, PRIMARY KEY (`syslog_id`) '; call branch_table('test', @field_list, 4, 2);
创建分表存储过程
DROP PROCEDURE IF EXISTS `branch_table`; CREATE PROCEDURE `branch_table`( IN p_table_name VARCHAR(200), IN p_field_list VARCHAR(2048), IN p_branch_size INT, in p_lpad INT ) BEGIN /*定义变量*/ DECLARE m_begin_row INT DEFAULT 0; WHILE m_begin_row<p_branch_size DO /*构造语句*/ SET @MAIN_STRING = CONCAT('CREATE TABLE ', p_table_name, '_', LPAD(m_begin_row, p_lpad, 0), '(', p_field_list ,')ENGINE=InnoDB DEFAULT CHARSET=utf8;'); /*预处理*/ PREPARE main_stmt FROM @MAIN_STRING; EXECUTE main_stmt; SET m_begin_row=m_begin_row+1; END WHILE; END;
前期没有分表数据量太大后期拆表用的MySQL存储过程
简单的办法是直接写
--假设根据user_id分表,分成64张
insert into table_new_0000 select * from table_old where mod(user_id,64)=0; insert into table_new_0001 select * from table_old where mod(user_id,64)=1;一共64条sql,OK 搞定。但是这个一张表被全表扫描了64次,做的无用功比较多,而且导致停机时间比较长
创建分表
delimeter // --- 全量脚本: CREATE PROCEDURE sp_xf_move_item() begin declare v_exit int default 0; declare v_spid bigint; declare v_id bigint; declare i int default 0; declare c_table int; --定义游标(要分拆的表,定义一个数量的截止时间) declare c_ids cursor for select id,user_id from item_records_0000 where gmt_modified < '2010-8-25 00:00:00'; declare continue handler for not found set v_exit=1; open c_ids; repeat --将需要的值装入变量 fetch c_ids into v_id,v_spid; if v_exit = 0 then set @vv_id = v_id; --根据取模字段获取数据存在的表 select mod(v_spid,64) into c_table; --组装动态sql SET @SQL_CONTEXT = CONCAT('insert into item_record_', LPAD(c_table, 4, 0), ' select * from item_records_0000 where id = ?'); PREPARE STMT FROM @SQL_CONTEXT; --执行sql EXECUTE STMT using @vv_id; DEALLOCATE PREPARE STMT; end if; set ii=i+1; --100条提交一次,以提高效率,记得执行存储过程前设置auto_commit if mod(i,100)=0 then commit; end if; until v_exit=1 end repeat; close c_ids; commit; end; //set auto_commit=0;
call sp_xf_move_item(); 添加数据
#### 增量脚本 ###### CREATE PROCEDURE sp_xf_add_item() begin declare v_exit int default 0; declare v_spid bigint; declare v_id bigint; declare i int default 0; declare c_table int; declare c_ids cursor for select id,supplier_id from item_records_0000 where gmt_modified >= '2010-8-25 00:00:00'; declare continue handler for not found set v_exit=1; open c_ids; repeat fetch c_ids into v_id,v_spid; if v_exit = 0 then set @vv_id = v_id; set @v_row=0; select mod(v_spid,64) into c_table; --判断数据是否已经存在 SET @SQL_C = CONCAT('select count(*) into @v_row from item_record_', LPAD(c_table, 4, 0), ' where id = ?'); PREPARE STMT_C FROM @SQL_C; EXECUTE STMT_C using @vv_id; DEALLOCATE PREPARE STMT_C; SET @SQL_INSERT = CONCAT('insert into bbc_item_record_', LPAD(c_table, 4, 0), ' select * from item_records_0000 where id = ?'); PREPARE STMT_I FROM @SQL_INSERT; SET @SQL_DELETE = CONCAT('DELETE FROM bbc_item_record_', LPAD(c_table, 4, 0), ' where id = ?'); PREPARE STMT_D FROM @SQL_DELETE; --如果数据已经存在,则先delete在insert if @v_row>0 then EXECUTE STMT_D using @vv_id; DEALLOCATE PREPARE STMT_D; end if; EXECUTE STMT_I using @vv_id; DEALLOCATE PREPARE STMT_I; end if; set ii=i+1; if mod(i,100)=0 then commit; end if; until v_exit=1 end repeat; close c_ids; commit; end; //call sp_xf_add_item()