About comparison

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Performance Questions...

. Even though ObjectDB implements LIKE very efficiently it still might be slower than other comparison
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persisting object with long[][] arrays of array

.clear();         emg.close();         EMF.close();     } as a comparison I ran it with simple arrays
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Possible issue for JPQL "LEFT [OUTER] JOIN"

b WHERE b.id IS NULL" but it works fine with an relationship comparison: "SELECT a,b FROM A a LEFT
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Possible issue for JPQL IS EMPTY expression

Possible issue for JPQL IS EMPTY comparison expression: SELECT e FROM MyEntity e WHERE e.collection-valued IS EMPTY throws javax.persistence.PersistenceException: Invalid operand type  for operator IS EMPTY (error 756) Thanks. Note: It doesn' t work with SIZE(): SELECT e FROM MyEntity e WHERE SIZE
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Pre-detach loading: retrieval by navigation not working in if statement

? If so, in order to perform a truly scientifically clean comparison, I might be able to fine-tune
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Querys slower when execute a query after every persist

classes are not enhanced every flush or commit requires comparison of object states in order
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substring works with string but not with char

, do you agree? I am not sure that this comparison is valid, since the type of the left side expression
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Vs. EHCache

Hi, I realize this is kind of like an apples vs. oranges comparison, but I would be interested if you have any performance information vs. something like ehcache with a persistent store. I'm currently evaluating for a simple schema to persist only 1 or 2 types of entities (but possibly 10k-100k
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in-memory and on-disk support?

. See for example comparison of RAM drives, including against a regular hard disk. Notice
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[ODB1] Chapter 7 - JDOQL Queries

a candidate object in other operations, such as method calls and comparison expressions. Fields Persistent ... fields can participate in queries in combination with comparison expressions, as in "this.age >= 18 ... expression (for example, when the || operator is used). Operators Comparison operators Comparison