ObjectDB Database Search

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jakarta.persistence.criteria.CriteriaBuilder.min(Expression)

Jakarta Persistence (JPA) Method in jakarta.persistence.criteria.CriteriaBuilder Expression min (    Expression x ) Create an aggregate expression applying the numerical min operation. Parameters: x - expression representing input value to min operation Returns: min expression. Since: Jakarta Persistence (JPA) 1.0

Comparison in JPQL and Criteria API

these examples, : min and :max are query parameters : x BETWEEN : min AND :max x = : min AND x ) Predicate gt1 = cb

GROUP BY and HAVING clauses

, where each group has a unique combination of values. Aggregate calculations ( COUNT , SUM , AVG , MAX , MIN ... a double . MIN : Returns the minimum of comparable values, such as numbers, strings, and dates. MAX ... values. min , least : Return an expression that represents the minimum of comparable values. max

FROM clause (JPQL / Criteria API)

, LOWER, MAX, MEMBER, MIN , MOD, NEW, NOT, NULL, NULLIF, OBJECT, OF, OR, ORDER, OUTER, POSITION, SELECT

Is ObjectDB better than competing object databases?

do not support aggregate queries (max, min , count, sum and avg). ObjectDB supports rich queries

Index Definition

. ObjectDB also uses indexes for sorting results and for projection: SELECT MIN (p.x) FROM Point p WHERE p.x

JPA Query Structure (JPQL / Criteria)

) Criteria WHERE ( where ) Criteria GROUP BY / HAVING ( groupBy , having , count , sum , avg , min

ObjectDB Object Database Features

). ORDER BY (including ASC, DESC). Aggregates (COUNT, SUM, AVG, MAX, MIN ). Query Expressions Path

JPA Criteria API Queries

BY and HAVING clauses ( groupBy , having , count , sum , avg , min , max , ...) ORDER BY clause

jakarta.persistence.criteria.CriteriaBuilder

to max operation Returns: max expression. Since: Jakarta Persistence (JPA) 1.0 Expression min ( Expression x ) Create an aggregate expression applying the numerical min operation. Parameters: x - expression representing input value to min operation Returns: min expression. Since: Jakarta Persistence (JPA

Soft Reference Object Cache Recommendation

collection option and explicitly set the min and max heap sizes.  Another option that affects soft

objectdb on single server 20TB storage possible ?

;      2600.0000     CPU min MHz:          1500

Memory Leak in EntityManagerFactory ?

testet only for 15 min ). Arne Arne Stocker In that case we have to look elsewhere. When applying

objectdb got hang after fetch some record.

same machine.   This is happening if multiple thread(20-50) accessing db parallelly for 30-40 min

Server connection management

to have configuration settings to control the connection pool ( min /max connections, etc...). Thanks, Carl

ObjectDB is opening too many sockets

this more on idle instances. thamal Tomas Hamal I forgot to attach the heap dumps: idle2_4_ min   - Server

javax.servlet.ServletException: Annotated methods must follow the JavaBeans naming convention. __odbHidden_getPropertyName

widthPxSideBarLeft = 250;     @ Min (150)     @Max(400)     ... ;   } It appears in part of a JSF template with dynamic CSS style parameters: style=" min

Server out of memory exceptions

After running for about 15mins I get out of memory exceptions The test fails faster (in about 2 mins

stress test -> com.objectdb.o.InternalException: null

out of memory in ~20 minutes. With a heap of 512 MB, in around 240 min (4 hours). Both cases

Pessimistic lock timeout - blocks indefinitely

but the others remain blocked (for longer than 5000ms at least - I killed the test after a min or so). If I