如何测量Firebird 2.1数据库上的Blob占用的空间量? [英] How can I measure the amount of space taken by blobs on a Firebird 2.1 database?

问题描述

我有一个使用Firebird 2.1的生产数据库，在这里我需要找出每个表(包括Blob)使用了多少空间.斑点部分是棘手的部分，因为标准统计报告未涵盖该部分.

I have a production database, using Firebird 2.1, where I need to find out how much space is used by each table, including the blobs. The blob-part is the tricky one, because it is not covered using the standard statistical report.

我无法轻松访问服务器的桌面，因此安装UDF等不是一个好的解决方案.

I do not have easy access to the server's desktop, so installing UDFs etc. is not a good solution.

我如何轻松地做到这一点?

How can I do this easily?

推荐答案

您可以使用以下语句来计算数据库中所有BLOB字段的总大小:

You can count total size of all BLOB fields in a database with following statement:

EXECUTE BLOCK RETURNS (BLOB_SIZE BIGINT)
AS
  DECLARE VARIABLE RN CHAR(31) CHARACTER SET UNICODE_FSS;
  DECLARE VARIABLE FN CHAR(31) CHARACTER SET UNICODE_FSS;
  DECLARE VARIABLE S BIGINT;
BEGIN
  BLOB_SIZE = 0;
  FOR
    SELECT r.rdb$relation_name, r.rdb$field_name 
      FROM rdb$relation_fields r JOIN rdb$fields f 
        ON r.rdb$field_source = f.rdb$field_name
    WHERE f.rdb$field_type = 261
    INTO :RN, :FN
  DO BEGIN
    EXECUTE STATEMENT
      'SELECT SUM(OCTET_LENGTH(' || :FN || ')) FROM ' || :RN ||
      ' WHERE NOT ' || :FN || ' IS NULL'
    INTO :S;
    BLOB_SIZE = :BLOB_SIZE + COALESCE(:S, 0);
  END
  SUSPEND;
END

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