ORA-02475: maximum cluster chain block count of string has been exceeded

文档解释

ORA-02475: maximum cluster chain block count of string has been exceeded

Cause: The number of blocks in a cluster chain exceeds the maximum number allowed.

Action: Increase SIZE parameter in CREATE CLUSTER statement or reconsider suitability of cluster key.

ORA-02475: maximum cluster chain block count of number has been exceeded 这是一个Oracle数据库中——注释中关于集群错误。它表明,由于使用超出限制的集群数据块,当前SQL语句无法执行。

它的官方解释如下:

ORA-02475: maximum cluster chain block count of string has been exceeded

Cause: The limit specified by the MAXCHAINBLOCKCOUNT parameter was exceeded while determining the links in a cluster chain.

Action: Increase the limit specified by MAXCHAINBLOCKCOUNT or modify the application’s SQL statement to reduce the size of the cluster.

常见案例

经常会出现ORA-02475错误,在处理大型集群表时尤其明显,尤其是当表的大小超过本地配置的最大限制时(以块与集群排序)。

正常处理方法及步骤

(1)确保在执行SQL语句时,有充足的内存分配给它

(2)确保MAXCHAINBLOCKCOUNT参数设置正确,并允许足够的时间来处理更大型的集群。

(3)避免在数据库会话上同时处理多个大型集群表的操作

(4)重新分析所有涉及的表,索引和约束

(5)检查与表上的列有关的条件,以确保只有少量记录被检索,而不是所有记录

(6)改用SUM()、MIN()、MAX()等函数来替换列,以免返回大量数据

(7)考虑重写语句,以减少大量关联事实表时出现的问题。

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