瀚高数据库V457-执行快速比较采样SQL时，出现了“tablesample method BERNOULLI does not exist”

数据库版本

瀚高安全版数据库系统V4.5.7, aarch64平台, 创建日期:20250918

执行sql1：

sql 复制代码

select "ZXBH","JZRQ","GRDKZH","DQQC","YWLSH","XuHao","DKYWMXLX" 
from "bsp"."ac0205" TABLESAMPLE BERNOULLI(3.64) 
order by "ZXBH","JZRQ","GRDKZH","DQQC","YWLSH","XuHao","DKYWMXLX"

执行查询：

2026-02-06 11:12:28.177 INFO [ImmediateWorker-hg2hg0205a-fastcmp-src203hg05a-tgt203hg05a-ImmediateCreator] c.b.p.f.PostgresqlTableAutoSlicer:239 - fast compare sample sql :select "ZXBH","JZRQ","GRDKZH","DQQC"

,"YWLSH","XuHao","DKYWMXLX" from "bsp"."ac0205" TABLESAMPLE BERNOULLI(3.64) order by "ZXBH","JZRQ","GRDKZH","DQQC","YWLSH","XuHao","DKYWMXLX"

2026-02-06 11:12:28.243 ERROR [ImmediateWorker-hg2hg0205a-fastcmp-src203hg05a-tgt203hg05a-ImmediateCreator] c.b.p.f.PostgresqlTableAutoSlicer:314 - table:ac0205分片失败。

com.highgo.jdbc.util.PSQLException: ERROR: tablesample method BERNOULLI does not exist

Position: 97

先检查抽样方法

执行sql1：

sql 复制代码

SELECT proname, prosrc 
FROM pg_proc 
WHERE proname LIKE '%sample%' OR proname LIKE '%bernoulli%' OR proname LIKE '%system%';

执行查询：

执行sql2：

替换关键字bernoulli小写

sql 复制代码

select "ZXBH","JZRQ","GRDKZH","DQQC","YWLSH","XuHao","DKYWMXLX" 
from "bsp"."ac0205" TABLESAMPLE bernoulli(3.64) order by "ZXBH","JZRQ","GRDKZH","DQQC","YWLSH","XuHao","DKYWMXLX"

换小写关键字可以查询bernoulli

执行查询：

考虑数据库大小写规则

sql 复制代码

SELECT name, setting 
FROM pg_settings 
WHERE name LIKE '%case%' OR name LIKE '%sensitive%';

瀚高数据库大小写规则参数解释

|name |setting|

|----------------------|-------|

|case_sensitive_db |on |

|krb_caseins_users |off |

|lower_case_table_names|1 |

|newcase_sensitive_db |on |

步骤1：修改大小写规则参数

newcase_sensitive_db=off

新增的在oracle模式下，使用"兼容mysql的大小写开关"

会话级修改

SET newcase_sensitive_db TO off;

执行查询：

sql 复制代码

select "ZXBH","JZRQ","GRDKZH","DQQC","YWLSH","XuHao","DKYWMXLX" 
from "bsp"."ac0205" TABLESAMPLE bernoulli(3.64) 
order by "ZXBH","JZRQ","GRDKZH","DQQC","YWLSH","XuHao","DKYWMXLX";

select "ZXBH","JZRQ","GRDKZH","DQQC","YWLSH","XuHao","DKYWMXLX" 
from "bsp"."ac0205" TABLESAMPLE BERNOULLI(3.64) 
order by "ZXBH","JZRQ","GRDKZH","DQQC","YWLSH","XuHao","DKYWMXLX";

此时BERNOULLI、bernoulli抽样方法都可以执行