【达梦数据库】添加自动收集统计信息的任务

达梦数据库有个弱点，当查询数据量大时，查询速度变得非常慢，工程师一般都会去更新统计信息，但是用户不能时不时去手动去操作，所以做了一个定时作业，让系统定时去做。
—添加自动收集统计信息的任务（每周六1点收集全库统计信息），在SYSDBA用户下执行

SP_INIT_JOB_SYS(1);        ----此语句如果报错，对象[SYSMAILINFO]已存在 等信息忽略就行，说明系统作业已经开启不影响
call SP_CREATE_JOB('statistics',1,0,'',0,0,'',0,'');
call SP_JOB_CONFIG_START('statistics');
call SP_ADD_JOB_STEP('statistics', 'statistics1', 0, 'begin for rs in (select ''sf_set_SESSION_para_value(''''HAGR_HASH_SIZE'''',(select cast( case when max(table_rowcount(owner,table_name))<=(select max_value from v$dm_ini where para_Name=''''HAGR_HASH_SIZE'''') and max(table_rowcount(owner,table_name))>=( select min_value from v$dm_ini where para_Name=''''HAGR_HASH_SIZE'''') then max(table_rowcount(owner,table_name)) when max(table_rowcount(owner,table_name))<( select min_value from v$dm_ini where para_Name=''''HAGR_HASH_SIZE'''') then (select min_value from v$dm_ini where para_Name=''''HAGR_HASH_SIZE'''') else (select max_value from v$dm_ini where para_Name=''''HAGR_HASH_SIZE'''') end as bigint) from dba_tables where owner=''''''||NAME||''''''));'' sql1,''DBMS_STATS.GATHER_SCHEMA_STATS(''''''||NAME||'''''',100,TRUE,''''FOR ALL COLUMNS SIZE AUTO'''');'' sql2 from SYS.SYSOBJECTS where TYPE$=''SCH'' ) loop execute immediate rs.sql1; execute immediate rs.sql2; end loop; end;', 0, 0, 0, 0, NULL, 0);
call SP_ADD_JOB_SCHEDULE('statistics', 'statistics1', 1, 2, 1, 64, 0, '01:00:00', NULL, '2021-11-08 14:54:37', NULL, '');
call SP_JOB_CONFIG_COMMIT('statistics');