Exhibit 31.2

CERTIFICATION

I, Gregory S. Collett, Principal Financial Officer of DB Commodity Services LLC, the Managing Owner
of PowerShares DB Commodity Index Tracking Fund, certify that:



| | 1. | I have reviewed this report on Form 10-K of PowerShares DB Commodity Index Tracking Fund;
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| | 2. | Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the
circumstances under which such statements were made, not misleading with respect to the period covered by this report;
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| | 3. | Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of
operations and cash flows of the Registrant as of, and for, the periods presented in this report;
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| | 4. | The Registrants other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules
13a-15(e) and 15d-15(e)) for the Registrant and have:
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| | a) | Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information
relating to the Registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which the Registrants financial statements and annual report on Form 10-K for the
fiscal year ended December 31, 2006 are being prepared;
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| | b) | Evaluated the effectiveness of the Registrants disclosure controls and procedures and presented in the Registrants annual report on Form 10-K for the fiscal year ended
December 31, 2006 our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by the Registrants annual report on Form 10-K for the fiscal year ended December 31, 2006 based
on such evaluation; and
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| | c) | Disclosed in the Registrants annual report on Form 10-K for the fiscal year ended December 31, 2006 any change in the Registrants internal control over financial
reporting that occurred during the Registrants most recent fiscal quarter (the Registrants fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the
Registrants internal control over financial reporting; and
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| | 5. | The Registrants other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the Registrants
auditors and the audit committee of the Registrants board of directors (or persons performing the equivalent functions):
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| | a) | All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the
Registrants ability to record, process, summarize and report financial information; and
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| | b) | Any fraud, whether or not material, that involves management or other employees who have a significant role in the Registrants internal control over financial reporting.
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|                     |  |  |  |                            
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|Date: March 27, 2007 |  |  |  | /s/ Gregory S. Collett     
|                     |  |  |  | Gregory Collett            
|                     |  |  |  | Principal Financial Officer