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达梦统计信息收集情况检查

news 来源：原创 2025/4/24 9:02:19

查询达梦某个对象上是否有统计信息

select id,T_TOTAL,N_SMAPLE,N_DISTINCT,N_NULL,BLEVEL,N_LEAF_PAGES,N_LEAF_USED_PAGES,LAST_GATHERED from sysstats where id IN (select id from sysobjects where upper(name)=upper('&objname'));

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可能有系统对象，可以增加过滤条件

整体收集情况粗看

select a.object_name,a.owner,a.object_type, T_TOTAL,b.last_gathered from dba_objects a,SYSSTATS b where a.object_id = b.id and b.t_flag<>'C' --and a.OWNER = '用户名'
order by b.last_gathered limit 150;

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看各列统计信息

--列统计信息
select c.name col_name,s.* from 
(select b.name tbl_name, n_distinct NUM_DISTINCT,n_null NUM_NULLS, n_leaf_pages LEAF_PAGES ,BLEVEL,t_total NUM_ROWS, N_SAMPLE SAMPLE_CNT,last_gathered, n_buckets ,col_avg_len,a.id,a.colid
from sysstats a,sysobjects b where a.id = b.id and b.name ='T1'   AND a.t_flag='C' ) s,
(select * from syscolumns where id IN (select id from sysobjects where name ='T1'))c
where c.colid=s.colid and c.id=s.id;

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想看最大最小值，请参考

SELECT USR.NAME AS OWNER_NAME,SCH.NAME AS SCHEMA_NAME,TAB.NAME AS TABLE_NAME,COL.NAME AS COLUMN_NAME,COL.TYPE$ AS COLUMN_TYPE,COL.COLID AS COLUMN_ID,CASE COL.TYPE$ WHEN 'NUMBER'    THEN ROUND(CAST(SF_BIN_GET_DOUBLE(S.V_MIN,0) AS NUMBER),COL.SCALE)WHEN 'INT'       THEN SF_BIN_GET_INT(S.V_MIN,0)WHEN 'INTEGER'   THEN SF_BIN_GET_INT(S.V_MIN,0)WHEN 'BIGINT'    THEN SF_BIN_GET_BIGINT(S.V_MIN,0)WHEN 'SMALLINT'  THEN SF_BIN_GET_SMALLINT(S.V_MIN,0)WHEN 'TINYINT'   THEN SF_BIN_GET_TINYINT(S.V_MIN,0)WHEN 'CHAR'      THEN BINTOCHAR2(S.V_MIN)WHEN 'NCHAR'     THEN BINTOCHAR2(S.V_MIN)WHEN 'NVARCHAR'  THEN BINTOCHAR2(S.V_MIN)WHEN 'NVARCHAR2' THEN BINTOCHAR2(S.V_MIN)WHEN 'VARCHAR2'  THEN BINTOCHAR2(S.V_MIN) WHEN 'VARCHAR'   THEN BINTOCHAR2(S.V_MIN)WHEN 'VARBINARY' THEN NVL2(S.V_MIN,'0x'||RAWTOHEX(SUBSTRBLB(S.V_MIN,5,SF_BIN_GET_INT(S.V_MIN,0))),NULL)WHEN 'DATE'      THEN TO_CHAR(BINTODATE(S.V_MIN),'yyyy-mm-dd')WHEN 'DATETIME'  THEN TO_CHAR(BINTODATE(S.V_MIN),'yyyy-mm-dd hh24:mi:ss')WHEN 'DATETIME WITH TIME ZONE'      THEN TO_CHAR(BINTODATE(S.V_MIN),'yyyy-mm-dd hh24:mi:ss TZH:TZM') WHEN 'TIMESTAMP' THEN TO_CHAR(BINTODATE(S.V_MIN),'yyyy-mm-dd hh24:mi:ss.ff6')WHEN 'DEC' THEN SF_BIN_GET_INT(S.V_MIN,0)ELSE RAWTOHEX(S.V_MIN)END AS MIN_VAL,CASE COL.TYPE$ WHEN 'NUMBER'    THEN ROUND(CAST(SF_BIN_GET_DOUBLE(S.V_MAX,0) AS NUMBER),COL.SCALE)WHEN 'INT'       THEN SF_BIN_GET_INT(S.V_MAX,0)WHEN 'INTEGER'   THEN SF_BIN_GET_INT(S.V_MAX,0)WHEN 'BIGINT'    THEN SF_BIN_GET_BIGINT(S.V_MAX,0)WHEN 'SMALLINT'  THEN SF_BIN_GET_SMALLINT(S.V_MAX,0)WHEN 'TINYINT'   THEN SF_BIN_GET_TINYINT(S.V_MAX,0)WHEN 'CHAR'      THEN BINTOCHAR2(S.V_MAX)WHEN 'NCHAR'     THEN BINTOCHAR2(S.V_MAX)WHEN 'NVARCHAR'  THEN BINTOCHAR2(S.V_MAX)WHEN 'NVARCHAR2' THEN BINTOCHAR2(S.V_MAX)WHEN 'VARCHAR2'  THEN BINTOCHAR2(S.V_MAX) WHEN 'VARCHAR'   THEN BINTOCHAR2(S.V_MAX)WHEN 'VARBINARY' THEN NVL2(S.V_MAX,'0x'||RAWTOHEX(SUBSTRBLB(S.V_MAX,5,SF_BIN_GET_INT(S.V_MAX,0))),NULL)  WHEN 'DATE'      THEN TO_CHAR(BINTODATE(S.V_MAX),'yyyy-mm-dd')WHEN 'DATETIME'  THEN TO_CHAR(BINTODATE(S.V_MAX),'yyyy-mm-dd hh24:mi:ss')WHEN 'DATETIME WITH TIME ZONE'      THEN TO_CHAR(BINTODATE(S.V_MAX),'yyyy-mm-dd hh24:mi:ss TZH:TZM') WHEN 'TIMESTAMP' THEN TO_CHAR(BINTODATE(S.V_MAX),'yyyy-mm-dd hh24:mi:ss.ff6')WHEN 'DEC' THEN SF_BIN_GET_INT(S.V_MAX,0)ELSE RAWTOHEX(S.V_MAX)END AS MAX_VAL,S.T_TOTAL,S.N_SAMPLE,S.N_DISTINCT,S.N_NULL,S.COL_AVG_LEN,S.LAST_GATHERED--,S.DATAFROM SYSSTATS S,SYSOBJECTS TAB,SYSCOLUMNS COL,SYSOBJECTS SCH,SYSOBJECTS USRWHERE S.ID = TAB.IDAND S.T_FLAG = 'C'AND COL.ID = S.IDAND COL.COLID = S.COLIDAND SCH.ID = TAB.SCHIDAND SCH.TYPE$ = 'SCH'AND TAB.TYPE$ = 'SCHOBJ'AND TAB.SUBTYPE$ IN ('UTAB','STAB')AND USR.TYPE$ = 'UR'AND USR.ID = SCH.PIDAND SCH.NAME = 'TEST'AND TAB.NAME = 'T1'ORDER BY 1,2,3,6;