OrientDB

Question

我正在使用 OrientDB Enterprise Server v2.1.13，遇到了一些我还找不到解释和解决方案的问题。

似乎自动复合 SB-Tree 索引工作不正常并且没有索引新值（或者我误解了什么）。 A 有以下边类:

CREATE CLASS ACTION EXTENDS E CLUSTERS 0 ABSTRACT

CREATE PROPERTY ACTION.out LINK
  ALTER PROPERTY ACTION.out MANDATORY true
  ALTER PROPERTY ACTION.out NOTNULL true

CREATE PROPERTY ACTION.in LINK
  ALTER PROPERTY ACTION.in MANDATORY true
  ALTER PROPERTY ACTION.in NOTNULL true

CREATE PROPERTY ACTION.action STRING
  ALTER PROPERTY ACTION.action MANDATORY true

CREATE PROPERTY ACTION.status STRING
  ALTER PROPERTY ACTION.status DEFAULT 'NEW'

CREATE INDEX ACTION.out_action_in ON ACTION (out, action, in) UNIQUE

CREATE CLASS LINK EXTENDS ACTION CLUSTERS 8
  ALTER CLASS LINK CLUSTERSELECTION balanced

CREATE INDEX LINK.out_action_in ON LINK (out, action, in) UNIQUE

然后我们插入：

CREATE EDGE LINK FROM #12:0 TO #30:0 SET action = 'a';

我们可以 SELECT 并查看它是否已正确插入数据库：

orientdb {db=userdata}> SELECT FROM LINK WHERE action = 'a';

----+-----+------+------+-----+-----+------
#   |@RID |@CLASS|action|out  |in   |status
----+-----+------+------+-----+-----+------
0   |#36:0|LINK  |a     |#12:0|#30:0|NEW   
----+-----+------+------+-----+-----+------

现在让我们创建 SB-Tree NOTUNIQUE 索引（默认）：

CREATE INDEX LINK.action_status ON LINK (action, status) NOTUNIQUE

现在我们创建一个新记录：

CREATE EDGE LINK FROM #12:0 TO #30:0 SET action = 'b';
orientdb {db=userdata}> SELECT FROM LINK

----+-----+------+------+-----+-----+------
#   |@RID |@CLASS|action|out  |in   |status
----+-----+------+------+-----+-----+------
0   |#36:0|LINK  |a     |#12:0|#30:0|NEW   
1   |#37:8|LINK  |b     |#12:0|#30:0|NEW   
----+-----+------+------+-----+-----+------

现在我们尝试 SELECT 'a' 和 'b' 值：

orientdb {db=userdata}> SELECT FROM LINK WHERE action = 'a'; 

----+-----+------+------+-----+-----+------
#   |@RID |@CLASS|action|out  |in   |status
----+-----+------+------+-----+-----+------
0   |#36:0|LINK  |a     |#12:0|#30:0|NEW   
----+-----+------+------+-----+-----+------

1 item(s) found. Query executed in 0.001 sec(s).

orientdb {db=userdata}> SELECT FROM LINK WHERE action = 'b';

0 item(s) found. Query executed in 0.001 sec(s).

解释：

Profiled command     '{fullySortedByIndex:false,compositeIndexUsed:1,involvedIndexes:[1],limit:-1,fetchingFromTargetElapsed:0,indexIsUsedInOrderBy:false,user:#5:0,elapsed:1.116033,resultType:collection,resultSize:0}' in 0,002000 sec(s):
{"@type":"d","@version":0,"fullySortedByIndex":false,"compositeIndexUsed":1,"involvedIndexes":["LINK.action_status"],"limit":-1,"fetchingFromTargetElapsed":0,"indexIsUsedInOrderBy":false,"user":"#5:0","elapsed":1.116033,"resultType":"collection","resultSize":0,"@fieldTypes":"compositeIndexUsed=l,involvedIndexes=e,fetchingFromTargetElapsed=l,user=x,elapsed=f"}

但是——如果你SELECT它使用 IN()——它就在那里：

orientdb {db=userdata}> SELECT FROM LINK WHERE action in ['b'];

----+-----+------+------+-----+-----+------
#   |@RID |@CLASS|action|out  |in   |status
----+-----+------+------+-----+-----+------
0   |#37:7|LINK  |b     |#12:0|#30:0|NEW   
----+-----+------+------+-----+-----+------

1 item(s) found. Query executed in 0.002 sec(s).

解释：

Profiled command '{documentReads:1,current:#36:1,documentAnalyzedCompatibleClass:1,recordReads:1,limit:-1,fetchingFromTargetElapsed:0,evaluated:1,user:#5:0,elapsed:0.666479,resultType:collection,resultSize:1}' in 0,002000 sec(s):
{"@type":"d","@version":0,"documentReads":1,"current":"#36:1","documentAnalyzedCompatibleClass":1,"recordReads":1,"limit":-1,"fetchingFromTargetElapsed":0,"evaluated":1,"user":"#5:0","elapsed":0.666479,"resultType":"collection","resultSize":1,"@fieldTypes":"documentReads=l,current=x,documentAnalyzedCompatibleClass=l,recordReads=l,fetchingFromTargetElapsed=l,evaluated=l,user=x,elapsed=f"}

对这个问题有什么建议吗？

Answer 1

目前我的解决方法是使用哈希索引，这在我的情况下似乎工作正常。

DROP INDEX LINK.action_status;
CREATE INDEX LINK.action_status ON LINK (action, status) NOTUNIQUE_HASH_INDEX;

orientdb {db=userdata}>     CREATE EDGE LINK FROM #12:0 TO #30:0 SET action = 'c';                   

Created edge '[LINK#38:4{action:c,out:#12:0,in:#30:0,status:NEW} v1]' in 0,003000 sec(s). 

orientdb {db=userdata}> SELECT FROM LINK;                                         

----+-----+------+------+-----+-----+------ 
#   |@RID |@CLASS|action|out  |in   |status 
----+-----+------+------+-----+-----+------ 
0   |#36:0|LINK  |a     |#12:0|#30:0|NEW   
1   |#37:8|LINK  |b     |#12:0|#30:0|NEW   
2   |#38:4|LINK  |c     |#12:0|#30:0|NEW   
----+-----+------+------+-----+-----+------ 

3 item(s) found. Query executed in 0.002 sec(s). 

orientdb {db=userdata}> SELECT FROM LINK WHERE action = 'c';                                         

----+-----+------+------+-----+-----+------ 
#   |@RID |@CLASS|action|out  |in   |status 
----+-----+------+------+-----+-----+------ 
0   |#38:4|LINK  |c     |#12:0|#30:0|NEW   
----+-----+------+------+-----+-----+------ 

1 item(s) found. Query executed in 0.002 sec(s). 

orientdb {db=userdata}> SELECT FROM LINK WHERE action in ['c']; 

----+-----+------+------+-----+-----+------ 
#   |@RID |@CLASS|action|out  |in   |status 
----+-----+------+------+-----+-----+------ 
0   |#38:4|LINK  |c     |#12:0|#30:0|NEW   
----+-----+------+------+-----+-----+------ 

1 item(s) found. Query executed in 0.002 sec(s).

OrientDB - 自动 SB-Tree 索引中缺少值

OrientDB - absent values in automatic SB-Tree index

sql

indexing