6

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.

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

How can I do this easily?

4

2 回答 2

9

您可以使用以下语句计算数据库中所有 BLOB 字段的总大小：

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
于 2010-09-14T19:17:59.543 回答
1

我修改了 Andrej 的代码示例以显示每个 blob 字段的大小，而不仅仅是所有 blob 的总和。

并使用了 SET TERM，因此您可以将此代码段直接复制并粘贴到 FlameRobin 等工具中。

SET TERM #;
EXECUTE BLOCK
RETURNS (BLOB_SIZE BIGINT, TABLENAME CHAR(31), FIELDNAME CHAR(31) )
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 || ')) AS BLOB_SIZE, ''' || :RN || ''', ''' || :FN || '''
      FROM ' || :RN ||
      ' WHERE NOT ' || :FN || ' IS NULL'
    INTO :BLOB_SIZE, :TABLENAME, :FIELDNAME;
    SUSPEND;
  END
END
#
SET TERM ;#

此示例不适用于 ORDER BY，也许存在没有 EXECUTE BLOCK 的更优雅的解决方案。

于 2016-12-17T02:41:28.507 回答