怎樣能dump內部數據結構?

最新推荐文章于 2025-01-14 14:28:45 发布

转载最新推荐文章于 2025-01-14 14:28:45 发布 · 75 阅读

本文介绍了一系列Oracle数据库命令，这些命令可用于获取关于内部数据结构的详细信息，包括控制文件内容、文件头、重做日志头、系统状态等。通过使用特定的alter session set events命令，可以深入了解Oracle数据库的工作原理。

下列命令能用于獲得關于內部數據結構的信息。

-- Dump control file contents
alter session set events 'immediate trace name CONTROLF level 10'
/

-- Dump file headers
alter session set events 'immediate trace name FILE_HDRS level 10'
/

-- Dump redo log headers
alter session set events 'immediate trace name REDOHDR level 10'
/

-- Dump the system state
-- NOTE: Take 3 successive SYSTEMSTATE dumps, with 10 minute intervals
alter session set events 'immediate trace name SYSTEMSTATE level 10'
/

-- Dump the process state
alter session set events 'immediate trace name PROCESSSTATE level 10'
/

-- Dump Library Cache details
alter session set events 'immediate trace name library_cache level 10'
/

-- Dump optimizer statistics whenever a SQL statement is parsed (hint: change statement or flush pool)
alter session set events '10053 trace name context forever, level 1'
/

-- Dump a database block (File/ Block must be converted to DBA address)
-- Convert file and block number to a DBA (database block address). Eg:
variable x varchar2;
exec :x := dbms_utility.make_data_block_address(1,12);
print x
alter session set events 'immediate trace name blockdump level 50360894'
/

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