Difference between revisions of "Storage Layout"
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| valign='top' | '''2.2. Path Index''' | | valign='top' | '''2.2. Path Index''' | ||
| − | | 1. Flag for path definition ( | + | | 1. Flag for path definition ({{Type|Boolean}}, always <code>true</code>; legacy)<br/>2. PathNode:<br/>2.1. Name reference ({{Type|Num}})<br/>2.2. Node kind ({{Type|Num}})<br/>2.3. Number of occurrences ({{Type|Num}})<br/>2.4. Number of children ({{Type|Num}})<br/>2.5. {{Type|Double}}; legacy, can be reused or discarded<br/>2.6. Recursive generation of child nodes (→ 2) |
| valign='top' | [https://github.com/BaseXdb/basex/blob/master/src/main/java/org/basex/index/path/PathSummary.java PathSummary()]<br/>[https://github.com/BaseXdb/basex/blob/master/src/main/java/org/basex/index/path/PathNode.java PathNode()] | | valign='top' | [https://github.com/BaseXdb/basex/blob/master/src/main/java/org/basex/index/path/PathSummary.java PathSummary()]<br/>[https://github.com/BaseXdb/basex/blob/master/src/main/java/org/basex/index/path/PathNode.java PathNode()] | ||
|- | |- | ||
| valign='top' | '''2.3. Namespaces''' | | valign='top' | '''2.3. Namespaces''' | ||
| − | | 1. Token set, storing prefixes ( | + | | 1. Token set, storing prefixes ({{Type|TokenSet}})<br/>2. Token set, storing URIs ({{Type|TokenSet}})<br/>3. NSNode:<br/>3.1. pre value ({{Type|Num}})<br/>3.2. References to prefix/URI pairs ({{Type|Nums}})<br/>3.3. Number of children ({{Type|Num}})<br/>3.4. Recursive generation of child nodes (→ 3) |
| valign='top' | [https://github.com/BaseXdb/basex/blob/master/src/main/java/org/basex/data/Namespaces.java Namespaces()]<br/>[https://github.com/BaseXdb/basex/blob/master/src/main/java/org/basex/data/NSNode.java NSNode()] | | valign='top' | [https://github.com/BaseXdb/basex/blob/master/src/main/java/org/basex/data/Namespaces.java Namespaces()]<br/>[https://github.com/BaseXdb/basex/blob/master/src/main/java/org/basex/data/NSNode.java NSNode()] | ||
|} | |} | ||
Revision as of 18:26, 26 October 2011
Version: 7.0
Data Types
Num: compressed integer (1-5 bytes)Token: length (Num) and bytes of UTF8 byte representationdouble: number, stored as tokenboolean: boolean (1 byte,00or01)TokenSet: key array (Tokens), next/bucket/size arrays (Nums)
inf.basex
| Description | Format | Method |
|---|---|---|
| Disk Data | Database meta information | DiskData() |
| 1. Meta Data | Key/value pairs, suffixed by empty key (Token/Token):• PERM → User Permissions
|
MetaData() Users() |
| 2. Main memory indexes | Key/value pairs, suffixed by empty key (Token/Token):• TAGS → Tag Index• ATTS → Attribute Index• PATH → Path Index• NS → Namespaces• DOCS → Document Index
|
DiskData() |
| 2.1. Name Index Element/attribute names |
1. Token set, storing all names (TokenSet)2. One StatsKey instance per entry: 2.1. Content kind ( Num)2.1.1. Number: min/max ( Doubles)2.1.2. Category: number of entries ( Num), entries (Tokens)2.2. Number of entries ( Num)2.3. Leaf flag ( Boolean)2.4. Maximum text length ( Double; legacy, could be Num)
|
Names() TokenSet.read() StatsKey() |
| 2.2. Path Index | 1. Flag for path definition (Boolean, always true; legacy)2. PathNode: 2.1. Name reference ( Num)2.2. Node kind ( Num)2.3. Number of occurrences ( Num)2.4. Number of children ( Num)2.5. Double; legacy, can be reused or discarded2.6. Recursive generation of child nodes (→ 2) |
PathSummary() PathNode() |
| 2.3. Namespaces | 1. Token set, storing prefixes (TokenSet)2. Token set, storing URIs ( TokenSet)3. NSNode: 3.1. pre value ( Num)3.2. References to prefix/URI pairs ( Nums)3.3. Number of children ( Num)3.4. Recursive generation of child nodes (→ 3) |
Namespaces() NSNode() |
