Hi, Yes, I will update the documentation.
Regards, Thomas On Saturday, April 18, 2015, sim <sim...@mail.ru> wrote: > Hi Noel, > > You was right, multi_threaded=true works fine. I can't see a thread > blocking any more, > but then h2 documentation has to be edited. > > Thank you. > > On Saturday, April 18, 2015 at 7:15:11 PM UTC+3, sim wrote: >> >> Hi Noel, >> Thank you for your answer. Do you think it helps? Then please explain >> for this: >> >> >> Multithreading Support >> >> This database is multithreading-safe. That means, if an application is >> multi-threaded, it does not need to worry about synchronizing access to the >> database. Internally, most requests to the same database are synchronized. >> That means an application can use multiple threads that access the same >> database at the same time, however if one thread executes a long running >> query, the other threads need to wait. >> In my case I have a thread with long running (~10s) query and I suspect >> database block another >> thread with another query. I hoped that MVCC had to solve this case or I >> something don't understand. >> >> >> >> >> On Saturday, April 18, 2015 at 5:46:35 PM UTC+3, Noel Grandin wrote: >>> >>> If you are not using the mvstore directly, then to get concurrency you >>> will need to add MULTI_THREAD=TRUE to your URL. >>> Just be warned that we are still thrashing the bugs out of that mode. >>> On Sat, 18 Apr 2015 at 15:27, sim <sim...@mail.ru> wrote: >>> >>>> Hi Noel, >>>> >>>> Just extra information - >>>> >>>> Tables >>>> ======= >>>> >>>> CREATE TABLE CLIENTS ( >>>> CL_ID BIGINT NOT NULL, >>>> CL_NAME VARCHAR(1024) DEFAULT '' NOT NULL, >>>> CONSTRAINT CLIENTS_pk PRIMARY KEY (CL_ID) >>>> ); >>>> >>>> CREATE INDEX CLIENTS_idx >>>> ON CLIENTS >>>> ( CL_NAME ASC ); >>>> >>>> CREATE TABLE REQUESTS ( >>>> REQ_ID IDENTITY NOT NULL, >>>> REQ_TYPE INTEGER NOT NULL, >>>> REQ_DATE TIMESTAMP DEFAULT current_timestamp() NOT NULL, >>>> CL_ID BIGINT NOT NULL, >>>> CONSTRAINT REQUESTS_pk PRIMARY KEY (REQ_ID) >>>> ); >>>> >>>> CREATE INDEX REQUESTS_TYPE_idx >>>> ON REQUESTS >>>> ( REQ_TYPE ASC ); >>>> >>>> CREATE INDEX REQUESTS_DATE_idx >>>> ON REQUESTS >>>> ( REQ_DATE ASC ); >>>> >>>> ALTER TABLE REQUESTS ADD CONSTRAINT CLIENTS_REQUESTS_fk >>>> FOREIGN KEY (CL_ID) >>>> REFERENCES CLIENTS (CL_ID) >>>> >>>> To access database I use FRM Slick, that generates queries >>>> >>>> for reading something like - select * from requests where req_date >>>> between start_date and end_date. >>>> for writing something like - insert into requests values >>>> (default,tev,ts,clid) >>>> >>>> In general I need another filter for reading query - on cl_id, so it >>>> would be >>>> select * from requests where req_date between start_date and end_date >>>> and cl_id=clid, >>>> >>>> but I found it takes 2 times longer to execute the query than the first >>>> one. So, after getting a result >>>> as List[Request] just use result.filter(r => r.cl_id == clid) >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> On Saturday, April 18, 2015 at 3:36:10 PM UTC+3, sim wrote: >>>>> >>>>> Hi Noel, >>>>> >>>>> Nothing special - jdbc:h2:tcp://192.168.1.10:9099/stats >>>>> >>>>> h2-1.4.187 with default MVStore >>>>> >>>>> >>>>> On Saturday, April 18, 2015 at 12:48:14 PM UTC+3, Noel Grandin wrote: >>>>>> >>>>>> What does your db URL look like? >>>>>> On Fri, 17 Apr 2015 at 20:32, sim <sim...@mail.ru> wrote: >>>>>> >>>>>>> Hi, >>>>>>> >>>>>>> Here is a logger output from my application: >>>>>>> >>>>>>> 2015-04-17 20:29:07,363 - [INFO] - from application in >>>>>>> play-akka.actor.default-dispatcher-24 >>>>>>> start to get statistic data - 2015-04-17 20:29:07.363 >>>>>>> >>>>>>> 2015-04-17 20:29:12,425 - [INFO] - from application in >>>>>>> application-akka.actor.default-dispatcher-12 >>>>>>> Couldn't save statistic messages - Futures timed out after [5000 >>>>>>> milliseconds] >>>>>>> >>>>>>> 2015-04-17 20:29:17,027 - [INFO] - from application in >>>>>>> play-akka.actor.default-dispatcher-24 >>>>>>> end to get statistic data - 2015-04-17 20:29:17.027 >>>>>>> >>>>>>> 2015-04-17 20:29:17,027 - [INFO] - from application in >>>>>>> play-akka.actor.default-dispatcher-24 >>>>>>> data records for 2015-04-17 - 197873 >>>>>>> >>>>>>> >>>>>>> A thread reads from a table statistics data - 197873 rows (it takes >>>>>>> about 10 seconds) >>>>>>> Inside this interval another thread is trying to write new data into >>>>>>> the table with 5 seconds timeout >>>>>>> and gets timeout. >>>>>>> >>>>>>> So my question - does MVSTORE really support concurrent read/write? >>>>>>> >>>>>>> Thank you >>>>>>> >>>>>>> -- >>>>>>> You received this message because you are subscribed to the Google >>>>>>> Groups "H2 Database" group. >>>>>>> To unsubscribe from this group and stop receiving emails from it, >>>>>>> send an email to h2-database...@googlegroups.com. >>>>>>> To post to this group, send email to h2-da...@googlegroups.com. >>>>>>> Visit this group at http://groups.google.com/group/h2-database. >>>>>>> For more options, visit https://groups.google.com/d/optout. >>>>>>> >>>>>> -- >>>> You received this message because you are subscribed to the Google >>>> Groups "H2 Database" group. >>>> To unsubscribe from this group and stop receiving emails from it, send >>>> an email to h2-database...@googlegroups.com. >>>> To post to this group, send email to h2-da...@googlegroups.com. >>>> Visit this group at http://groups.google.com/group/h2-database. >>>> For more options, visit https://groups.google.com/d/optout. >>>> >>> -- > You received this message because you are subscribed to the Google Groups > "H2 Database" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to h2-database+unsubscr...@googlegroups.com > <javascript:_e(%7B%7D,'cvml','h2-database%2bunsubscr...@googlegroups.com');> > . > To post to this group, send email to h2-database@googlegroups.com > <javascript:_e(%7B%7D,'cvml','h2-database@googlegroups.com');>. > Visit this group at http://groups.google.com/group/h2-database. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "H2 Database" group. 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