Hello, all: Derby is used in my application in the in-memory only mode. For a long time Derby's lock logic caused no worries, but recently some use cases failed with lock timeouts. Thus I'm looking for guidance on best practices for handling locks in Derby. A use-case which may cause timeouts to obtain a lock: one thread is executing an SQL statement which accesses two (or more) in-memory tables. Those two tables are being modified by other threads at random times. So, situations in which the SQL is executed for a long time and the other threads are frequently updating the tables may cause lock timeouts.
Besides best practices to avoid timeouts and deadlocks, I would like to ask the following questions: 1) What's the default length of lock timeouts? 2) Does my app need another layer of synchronization mechanism/locks to avoid attempts to update in-memory tables or execute SQLs against them? 3) Can my application utilize Derby's locks through some API - to query their state or to use them in making a decision of whether to batch updates or to execute them, to wait or execute the SQLs? Your help would be greatly appreciated, Pavel. Jefferies archives and monitors outgoing and incoming e-mail. The contents of this email, including any attachments, are confidential to the ordinary user of the email address to which it was addressed. If you are not the addressee of this email you may not copy, forward, disclose or otherwise use it or any part of it in any form whatsoever. This email may be produced at the request of regulators or in connection with civil litigation. Jefferies accepts no liability for any errors or omissions arising as a result of transmission. Use by other than intended recipients is prohibited. In the United Kingdom, Jefferies operates as Jefferies International Limited; registered in England: no. 1978621; registered office: Vintners Place, 68 Upper Thames Street, London EC4V 3BJ. Jefferies International Limited is authorised and regulated by the Financial Services Authority.
