oracle – 数据加载到巨大的分区表

我有一张大桌子.第一个范围由price_date分区,然后由fund_id分区.该表有4.3亿行.每天我都有一个批处理工作,每天插入150万到300万行.

我们正在寻找启用和禁用本地索引(不是所有索引,而是基于数据仅由数据触摸的数据)

有没有人有经验使插入大表运行更快,没有删除和重建技术？

有没有人对这种情况有任何建议？

解决方法

http://www.evdbt.com/TGorman%20TD2005%20DWScale.doc

这有效.

您是否面临挑战：在线查询或迟到的数据可以访问暂存区域(例如,您今天可以获得今天/昨天的任何一天)吗？

我有代码扫描我将要加载的记录数据集,并标记本地索引子分区,如果要修改表子分区. (我使用的不是Tim Gorman的上述参考,因为我有迟到的数据,需要同时为最终用户提供临时区域和仓库.)

我的表是范围/列表,而不是范围/哈希.所以你将不得不修改它,可能使用ORA_HASH函数来找到正确的子分区.我还写了一个表格,我将要标记为不可用的子分区,所以我可以在一次通过中完成所有这些操作.在单个ALTER TABLE语句中将所有子分区的索引标记为不可用可能稍微有效一些;我最初只是禁用BITMAP索引,但即使在数据加载期间使单个B *树索引脱机也显着提高了效率.

procedure DISABLE_LOCAL_INDEXES as
     l_part_name varchar2(30);
     l_subpart_name varchar2(30);
     l_sql varchar2(2000);
     type partition_rec_type is record
     (table_name         varchar2(30),partition_name     varchar2(30),subpartition_name  varchar2(30),list_value         varchar2(10),min_ts             timestamp,max_ts             timestamp);
     type partition_recs_type
                         is table of partition_rec_type;
     l_partition_recs    partition_recs_type := partition_recs_type();
     l_partition_rec     partition_rec_type;
     l_subpart_id        number := 1;
     l_start_ts          timestamp;
     l_end_ts            timestamp;
     l_found_list_part boolean;
   begin
     -- build set of subpartitions
     l_start_ts := to_timestamp ('1970-01-01','yyyy-mm-dd');
     for i in (select p.table_name,p.partition_name,sp.subpartition_name,p.high_value as part_high_value,sp.high_value as subpart_high_value,p.partition_position,sp.subpartition_position
                 from user_tab_subpartitions sp
                      inner join user_tab_partitions p
                         on p.table_name     = sp.table_name
                        and p.partition_name = sp.partition_name
                where p.table_name = 'MY_TARGET_TABLE'
                order by p.partition_position,sp.subpartition_position)
     loop
       if ( (i.partition_position <> 1) and (i.subpartition_position = 1) ) then
         l_start_ts    := l_end_ts + to_dsinterval('0 00:00:00.000000001');
       end if;
       if (i.subpartition_position = 1) then
         l_end_ts := high_val_to_ts (i.part_high_value);
         l_end_ts := l_end_ts - to_dsinterval('0 00:00:00.000000001');
       end if;
       l_partition_rec.table_name        := i.table_name;
       l_partition_rec.partition_name    := i.partition_name;
       l_partition_rec.subpartition_name := i.subpartition_name;
       l_partition_rec.list_value        := i.subpart_high_value;
       l_partition_rec.min_ts            := l_start_ts;
       l_partition_rec.max_ts            := l_end_ts;
       l_partition_recs.extend();
       l_partition_recs(l_subpart_id) := l_partition_rec;
       l_subpart_id := l_subpart_id + 1;
     end loop;
     -- for every combination of list column and date column
     -- which is going to be pushed to MY_TARGET_TABLE
     -- find the subpartition
     -- otherwise find the partition and default subpartition
     for i in (select distinct LIST_COLUMN,DATE_COLUMN as DATE_VALUE
                 from MY_SOURCE_TABLE
                where IT_IS_BEING_MOVED_TO_TARGET IS TRUE)
     loop
       -- iterate over the partitions
       l_found_list_part := false;
       for k in l_partition_recs.first..l_partition_recs.last
       loop
         -- find the right partition / subpartition for list_value / date_value
         if (    (i.DATE_VALUE >= l_partition_recs(k).min_ts)
             and (i.DATE_VALUE <= l_partition_recs(k).max_ts) ) then
           if (l_found_list_value = false) then
             if (to_char(i.LIST_COLUMN,'9999') = l_partition_recs(k).LIST_COLUMN) then
               l_found_list_value := true;
             elsif (l_partition_recs(k).LIST_COLUMN = 'DEFAULT') then
               l_partition_rec := l_partition_recs(k);
             end if;
           end if;
         end if;
       end loop;  -- over l_partition_recs
       -- log those partitions for later index rebuild
       begin
         insert into index_subpart_rebuild
           (table_name,partition_name,subpartition_name)
         values
           (l_partition_rec.table_name,l_partition_rec.partition_name,l_partition_rec.subpartition_name);
       exception
         when dup_val_on_index then null;
         when others then raise;
       end;
     end loop;  -- over MY_TARGET_TABLE.DATE_VALUE values
     commit;
     for i in (select ui.index_name,uis.subpartition_name
                 from user_indexes ui
                      inner join user_ind_subpartitions uis
                         on ui.index_name = uis.index_name
                      inner join index_subpart_rebuild re
                         on re.subpartition_name = uis.subpartition_name
                where ui.table_name = 'MY_TARGET_TABLE')
     loop
       l_sql := 'alter index ' || i.index_name ||
                ' modify subpartition ' || i.subpartition_name || ' unusable';
       execute immediate l_sql;
     end loop;
   end DISABLE_LOCAL_INDEXES;

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