DB2 手动修改索引统计信息时： SQL1227N Reason Code = "8"

问题：

 在手动修改某个索引的统计信息时，报错 SQL1227N,  Reason Code = "8"：

DB21034E  The command was processed as an SQL statement because it was not a 

valid Command Line Processor command.  During SQL processing it returned:

SQL1227N  The catalog statistic "1" for column "INDCARD" is out of range for 

its target column, has an invalid format, or is inconsistent in relation to 

some other statistic. Reason Code = "8".  SQLSTATE=23521

问题分析：

 可能的原因之一是统计信息与对应表的不一致。

重现：

 $ db2level

DB21085I  Instance "e97q6c" uses "64" bits and DB2 code release "SQL09076" with 

level identifier "08070107".

Informational tokens are "DB2 v9.7.0.6", "s120629", "IP23414", and Fix Pack 

"6".

Product is installed at "/opt/IBM/db2/V9.7.6".

$ db2 "create table t1(id int, name char(20))"

DB20000I  The SQL command completed successfully.

$ db2 "insert into  t1 values(1,'ab'),(2,'bc'),(3,'cd'),(1,'ef'),(4,'bc'),(5,'bc')"

DB20000I  The SQL command completed successfully.

$ db2 "create index idx1 on t1(id)"                                 

DB20000I  The SQL command completed successfully.

$ db2 "create index idx2 on t1(name)"

DB20000I  The SQL command completed successfully.

$ db2 "select NLEAF, NLEVELS, INDCARD, substr(INDNAME,1,30) as INDNAME from syscat.indexes where TABNAME='T1'"  

NLEAF                NLEVELS INDCARD              INDNAME                       

-------------------- ------- -------------------- ------------------------------

                  -1      -1                   -1 IDX1                          

                  -1      -1                   -1 IDX2                          

  2 record(s) selected.

$  db2 "runstats on table E97Q6C.T1 and detailed INDEXES ALL"

DB20000I  The RUNSTATS command completed successfully.

$  db2 "select NLEAF, NLEVELS, INDCARD, substr(INDNAME,1,30) as INDNAME from syscat.indexes where TABNAME='T1'"  

NLEAF                NLEVELS INDCARD              INDNAME                       

-------------------- ------- -------------------- ------------------------------

                   1       1                    6 IDX1                          

                   1       1                    6 IDX2                          

  2 record(s) selected.

$ db2 " update SYSSTAT.INDEXES set INDCARD=5 where INDNAME='IDX1' and tabname= 'T1' "

DB21034E  The command was processed as an SQL statement because it was not a 

valid Command Line Processor command.  During SQL processing it returned:

SQL1227N  The catalog statistic "5" for column "INDCARD" is out of range for 

its target column, has an invalid format, or is inconsistent in relation to 

some other statistic. Reason Code = "8".  SQLSTATE=23521

  

$ db2 " update SYSSTAT.INDEXES set INDCARD=6 where INDNAME='IDX1' and tabname= 'T1' "

DB20000I  The SQL command completed successfully.

$ db2 " update SYSSTAT.INDEXES set INDCARD=188 where INDNAME='IDX1' and tabname= 'T1' "

DB21034E  The command was processed as an SQL statement because it was not a 

valid Command Line Processor command.  During SQL processing it returned:

SQL1227N  The catalog statistic "188" for column "INDCARD" is out of range for 

its target column, has an invalid format, or is inconsistent in relation to 

some other statistic. Reason Code = "8".  SQLSTATE=23521

解决：

先修改表的统计信息，再修改索引的统计信息，使其保持一致

$ db2 "update SYSSTAT.TABLES SET CARD=188 where tabname='T1'"

DB20000I  The SQL command completed successfully.

$ db2 " update SYSSTAT.INDEXES set INDCARD=188 where INDNAME='IDX1' and tabname= 'T1' "

DB20000I  The SQL command completed successfully.

$ db2 "select NLEAF, NLEVELS, INDCARD, substr(INDNAME,1,30) as INDNAME from syscat.indexes where TABNAME='T1'" 

NLEAF                NLEVELS INDCARD              INDNAME                       

-------------------- ------- -------------------- ------------------------------

                   1       1                  188 IDX1                          

                   1       1                    6 IDX2                          

  2 record(s) selected.

  

  

  

----------------------------------------------------------------------

在以下的版本中测试，得到完全相同的结果：

[db2b /home/db2users/e101q3a]$ db2level

DB21085I  This instance or install (instance name, where applicable: "e101q3a") 

uses "64" bits and DB2 code release "SQL10013" with level identifier 

"0204010E".

Informational tokens are "DB2 v10.1.0.3", "s130918", "IP23509", and Fix Pack 

"3".

Product is installed at "/opt/IBM/db2/V10.1.3".