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Microsoft SQL Server 2008 Internals
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B-tree Consistency Checks
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The cross-page consistency checks for a B-tree validate linkages within a B-tree level, between B-tree levels, and the consistency of key ranges across and between levels. For pages at the leaf level of an index, page linkage facts are generated from the page headers, plus facts from the rst and last records on the page (to give the key range contained on the page). For pages at the non-leaf levels of an index, all these facts are produced plus a fact from every record on the page, containing a pointer to the page at the next level down in the B-tree that record references. When the facts are aggregated, the following checks are made:
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A page pointed to by the next-page linkage in a page s header must have the same B-tree level. If this check fails, error 2531 is reported. The child-page linkage from a non-leaf (parent) page can link only to a page that is one level below it in the B-tree. If this check fails, error 8931 is reported. The previous-page linkage must agree with the ordering of child-page links in the parent page. If a parent page has page B following page A, then the previous-page linkage in page B s page header must link to page A. If this check fails, error 8935 is reported, as shown here:
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Msg 8935, Level 16, State 1, Line 3 Table error: Object ID 1349579846, index ID 1, partition ID 72057594040811520, alloc unit ID 72057594046382080 (type In-row data). The previous link (1:233719) on page (1:233832) does not match the previous page (1:275049) that the parent (1:42062), slot 16 expects for this page.
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If the next-page linkage in the page header of page A links to page B, the previous-page linkage in the page header of page B must link back to page A. if this check fails, error 8936 is reported, as shown here:
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Msg 8936, Level 16, State 1, Line 3 Table error: Object ID 1349579846, index ID 1, partition ID 72057594040811520, alloc unit ID 72057594046382080 (type In-row data). B-tree chain linkage mismatch. (1:275049)->next = (1:233832), but (1:233832)->Prev = (1:233719).
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A page can only be linked to by a single non-leaf page higher in the B-tree (that is, it cannot have two child-page linkages from two parent pages). If this check fails, error 8937 is reported, as shown here:
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Msg 8937, Level 16, State 1, Line 3 Table error: Object ID 1349579846, index ID 1, partition ID 72057594040811520, alloc unit ID 72057594046382080 (type In-row data). B-tree page (1:148135) has two parent nodes (1:212962), slot 20 and (1:233839), slot 1.
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A page should only be encountered once by the DBCC CHECKDB scan. If this check fails, error 8973 is reported.
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11
DBCC Internals
A page must be encountered if a child-page linkage on a parent page links down to it and a page in the same level has a previous-page link to it. If this check fails, error 8976 is reported, as shown here:
Msg 8976, Level 16, State 1, Line 1 Table error: Object ID 2073058421, index ID 1, partition ID 72057594038386688, alloc unit ID 72057594042384384 (type In-row data). Page (1:158) was not seen in the scan although its parent (1:154) and previous (1:157) refer to it. Check any previous errors.
Every page in the B-tree must have a parent page with a child-page linkage that links to it. If this check fails, error 8977 is reported, as shown here:
Msg 8977, Level 16, State 1, Line 3 Table error: Object ID 1349579846, index ID 1, partition ID 72057594040811520, alloc unit ID 72057594046382080 (type In-row data). Parent node for page (1:163989) was not encountered.
Every page in the B-tree must have a previous page with a next-page linkage that links to it. This includes those on the left-hand edge of the B-tree, where a fake linkage fact is created to make the aggregation work. If this check fails, error 8978 is reported, as shown here:
Msg 8978, Level 16, State 1, Line 3 Table error: Object ID 1349579846, index ID 1, partition ID 72057594040811520, alloc unit ID 72057594046382080 (type In-row data). Page (1:238482) is missing a reference from previous page (1:233835). Possible chain linkage problem.
Every B-tree page must have a parent page with a child-page linkage that links to it, and a previous page with a next-page linkage that links to it. This includes those pages on the left-hand edge of the B-tree. When this is not the case, it is often the root page of the B-tree that has the problem, and is caused by a corrupt system catalog entry. This is why this error was created which is really a combination of the two errors above. If this check fails, error 8979 is reported, as shown here:
Msg 8979, Level 16, State 1, Line 1 Table error: Object ID 768057822, index ID 8. Page (1:92278) is missing references from parent (unknown) and previous (page (3:10168)) nodes. Possible bad root entry in sysindexes.
The page linked to by a child-page linkage in a parent page must be encountered as a valid page in the B-tree by the DBCC CHECKDB scan. If this check fails, error 8980 is reported, as shown here:
Msg 8980, Level 16, State 1, Line 1 Table error: Object ID 421576540, index ID 8. Index node page (1:90702), slot 17 refers to child page (3:10183) and previous child (3:10182), but they were not encountered.
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