Difference between revisions of "Storage Layout"
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| valign='top' | [https://github.com/BaseXdb/basex/blob/master/src/main/java/org/basex/data/DiskData.java DiskData()] | | valign='top' | [https://github.com/BaseXdb/basex/blob/master/src/main/java/org/basex/data/DiskData.java DiskData()] | ||
|- | |- | ||
− | | valign='top' | '''2.1. Name Index''' | + | | valign='top' | '''2.1. Name Index'''<br/>Element/attribute names |
− | | Token set, enrichted with statistical information:<br />1. Token set: key array (<code>Tokens</code>), next/bucket/size arrays (<code>Nums</code>)<br />2. Content kind (<code>Num</code>)<br />2.1 Number: min/max (<code>Doubles</code>)<br />2.2. Category: number of entries (<code>Num</code>), entries (<code>Tokens</code>)<br />2.3 Number of entries (<code>Num</code>)<br />2.4 Leaf flag (<code>Boolean</code>)<br />2.5 Maximum text length (<code>Double</code>; | + | | Token set, enrichted with statistical information:<br />1. Token set: key array (<code>Tokens</code>), next/bucket/size arrays (<code>Nums</code>)<br />2. Content kind (<code>Num</code>)<br />2.1 Number: min/max (<code>Doubles</code>)<br />2.2. Category: number of entries (<code>Num</code>), entries (<code>Tokens</code>)<br />2.3 Number of entries (<code>Num</code>)<br />2.4 Leaf flag (<code>Boolean</code>)<br />2.5 Maximum text length (<code>Double</code>; legacy, could be <code>Num</code>) |
| valign='top' | [https://github.com/BaseXdb/basex/blob/master/src/main/java/org/basex/index/Names.java Names()]<br/>[https://github.com/BaseXdb/basex/blob/master/src/main/java/org/basex/util/hash/TokenSet.java TokenSet()]<br/>[https://github.com/BaseXdb/basex/blob/master/src/main/java/org/basex/index/StatsKey.java StatsKey()] | | valign='top' | [https://github.com/BaseXdb/basex/blob/master/src/main/java/org/basex/index/Names.java Names()]<br/>[https://github.com/BaseXdb/basex/blob/master/src/main/java/org/basex/util/hash/TokenSet.java TokenSet()]<br/>[https://github.com/BaseXdb/basex/blob/master/src/main/java/org/basex/index/StatsKey.java StatsKey()] | ||
+ | |- | ||
+ | | valign='top' | '''2.2. Path Index''' | ||
+ | | | ||
+ | | | ||
|} | |} |
Revision as of 16:15, 26 October 2011
Data Types
Num
: compressed integer (1-5 bytes)Token
: length (Num
) and bytes of UTF8 byte representationdouble
: number, stored as tokenboolean
: boolean (1 byte,00
or01
)
inf.basex
Description | Format | Method |
---|---|---|
Disk Data | Database meta information | DiskData() |
1. Meta Data | Pairs of key/value tokens, suffixed by empty key: • PERM → User Permissions
|
MetaData.read() Users.read() |
2. Main memory indexes | Pairs of key/value tokens, suffixed by empty key: • TAGS → Tag Index• ATTS → Attribute Index• PATH → Path Index• NS → Namespaces• DOCS → Document Index
|
DiskData() |
2.1. Name Index Element/attribute names |
Token set, enrichted with statistical information: 1. Token set: key array ( Tokens ), next/bucket/size arrays (Nums )2. Content kind ( Num )2.1 Number: min/max ( Doubles )2.2. Category: number of entries ( Num ), entries (Tokens )2.3 Number of entries ( Num )2.4 Leaf flag ( Boolean )2.5 Maximum text length ( Double ; legacy, could be Num )
|
Names() TokenSet() StatsKey() |
2.2. Path Index |