Large Sets and Maps

Trove

My test results for HashSet on Java 8

1M THashSets with 10 2 char strings each 620 MB
1M HashSets with 10 2 char strings each 955 MB 54% larger than Trove THashSet

Comments

Post a Comment

Popular posts from this blog

Sites, Newsletters, and Blogs

BLOGS Java.net Weblogs Martin Fowler's blog Paul Graham Ruminations of a Programmer Form Follows Function Newsletters Core Java Tech Tips Enterprise Java Tech Tips JavaSpecialists.EU TheServerSide.com Sites Java.net Today Hot Java Sites CSS Zen Garden Evernote Hacker News Pragmatic Programmer
Read more

Oracle JDBC ReadTimeout QueryTimeout

If a query exceeds the oracle.jdbc.ReadTimeout without receiving any data, an exception is thrown and the connection is terminated by the Oracle driver on the client. Unfortunately the session will still be queued on the database and continue to wait for locks, hold any current locks, and complete any DML/PL*SQL procedures that are pending on the server-side of the orphaned connection. If an application, on a another connection, due to ReadTimeout exception, retries DML/PL*SQL  which requires locks, those queries will queue behind the initial DML/PL*SQL. This will increase the workload exacerbating the situation. On applications with retries, this can be observed by querying the v$session table  or gv$session on RAC and noting new sessions started periodically based on the ReadTimeout interval. The sessions may often have the same SQL_ID and/or SQL_HASH_VALUE. If stmt.setQueryTimeout(Seconds) is issued and the statement exceeds the timeout, it will attempt to cancel the associated
Read more