Oracle 视图 V$LOG_HISTORY 官方解释,作用,如何使用详细说明

本站中文解释

Oracle视图V$LOG_HISTORY是Oracle数据库的一个系统视图,可以用于跟踪归档日志的使用情况。它包含有关归档日志文件的元数据信息,如归档日志文件的名称、归档日志文件大小和归档日志文件是否被使用等。

要访问Oracle视图V$LOG_HISTORY,只需使用SELECT语句即可。下面是一个示例,其中使用SELECT语句查询V$LOG_HISTORY视图。

SELECT *
FROM v$log_history;

此查询将返回有关归档日志文件的所有信息,如归档日志文件的名称、大小以及是否被使用等。如果要仅查询某些特定的字段,可以将字段名替换为SELECT语句中的选择列表,以获得更加特定的信息。例如,要查询归档日志文件名称和大小,可以将上述查询更改为以下查询。

SELECT LOG_NAME, LOG_SIZE
FROM v$log_history;

除了使用SELECT语句以外,还可以使用DELETE语句从V$LOG_HISTORY视图中删除特定的日志信息,例如:

DELETE FROM v$log_history WHERE log_name = ‘LOG_FILE.LOG’;

官方英文解释

V$LOG_HISTORY displays log history information from the control file.

Column Datatype Description

RECID

NUMBER

Control file record ID

STAMP

NUMBER

Control file record stamp

THREAD#

NUMBER

Thread number of the archived log

SEQUENCE#

NUMBER

Sequence number of the archived log

FIRST_CHANGE#

NUMBER

Lowest system change number (SCN) in the log

FIRST_TIME

DATE

Time of the first entry (lowest SCN) in the log

NEXT_CHANGE#

NUMBER

Highest SCN in the log

RESETLOGS_CHANGE#

NUMBER

Resetlogs change number of the database when the log was written

RESETLOGS_TIME

DATE

Resetlogs time of the database when the log was written

CON_ID

NUMBER

The ID of the container to which the data pertains. Possible values include:

  • 0: This value is used for rows containing data that pertain to the entire CDB. This value is also used for rows in non-CDBs.

  • 1: This value is used for rows containing data that pertain to only the root

  • n: Where n is the applicable container ID for the rows containing data


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