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4

ObjectDB's Database Doctor Incorrect Error Report

. Have you set the database page size to 256KB? The maximum supported page size is 64KB, but unfortunately ... there will be a clear limit of 64KB. Thank you for this report. To avoid this error use page size of 64KB or ... page size?  For my use case, this would make 4 less disk accesses in the Amazon AWS EC2 provisioned
Issue
3

Use temporary files to enable very large transactions

. the total size of database pages that have to be replaced) is limited by the JVM heap size. Supporting ... that can address your needs. Particularly the unlimited size. The memory problem is with Page ... to support unlimited number of Page instances. Regarding a new maximum for transaction size. In the long term
Issue
3

each 1-2 days objects on some objectdb level lock/block each other

thread dump shows a page cache lock (0x00000000b6681e10) by one thread. The second thread dump ... " resize="256kb" page="2kb" />
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3

Join performance in Objectdb

SELECT count(e) FROM Meta e, ImageNet i, Page p WHERE e.idImage=i.id AND e.idPage=p.id; So simple ... recommended when using JPA. It seems that a Meta instance holds the IDS of an Image and a Page instances ... ) FROM Meta e, ImageNet i, Page p WHERE e.image=i AND e.page=p Anyway, this still doesn't justify
Issue
2

[ObjectDB 2.6.9] Unexpected exception (Error 990)

] cl.intelidata.jpaodb.Movil - Unexpected object count: 142351618 (actual 142351616) Page Relation Errors -------------------- [1] Page #36099460 unexpected exception: null [2] Page #36099460 last key is null, parent page #43650945 next key is ('3.203.10.00.100000','95798112',2421822 8) [3
Issue
2

Database access error , Doctor hanging on trying to repair, production shutdown at our biggest customer

.ObjectProperty   - Unexpected object count: 49830620 (actual 49830619) Page Content Errors ------------------- [1] Page #16748245 has a non first section entry (at entry 1). Index Errors ------------ [1 ... : Page#7880349 5:194359909 0/2 0+1954/2699 ... The main error message may possibly reflect
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2

How Should I Configure objectdb.conf to Obtain 256KB Disk IO Requests and Maximize Shared PersistenceManager Entity Cache?

caching 1 MB (4 256KB sized pages).  The goal is to have frequent PersistenceManager L1 cache hit ... mentioned above) appropriate to achieve this goal?   Having larger database pages may have other effects (e.g. searching for an object in a larger page could take longer). So, as with most tuning questions
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2

Iterating over large result set

in memory was quite a challenge even with 3GB heap space. So I did paging using two loops. for (int page=0; page < resultCount; page+=pageSize) {     Query q = em.createQuery("query");     for (Tuple t : q.setFirstResult(page).setMaxResults(pageSize).getResultList()) {         // work
Issue
2

Querying error - java.lang.ClassCastException: com.objectdb.o.STV

splits large objects (> 2000 bytes) into pages. Somehow the stack trace indicates an unexpected state in which the same object is marked as small in one page and as large in another page. Maybe ... : 3691044274576634723 (expected 1378) [5] Unexpected total page count: 8719319783396618851 (expected 2816
Issue
2

Server out of memory exceptions

on the server side became higher mainly due to increasing page cache size. I see that the test uses 4 different databases (2 large and 2 small). The default size of each page cache (per database) is 64MB ... (page caches of the 2 other databases, query results caches, etc.) consume additional memory