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was宕機(jī)常見問題及參考解決方案(參考版)

2025-06-08 19:42本頁面
  

【正文】 。死鎖(Dead Lock)數(shù)據(jù)庫連接也是一種資源,如果有某線程同時(shí)要用到多個(gè)數(shù)據(jù)庫連接,但是在申請(qǐng)數(shù)據(jù)庫連接的時(shí)候不是一次性的獲取所有數(shù)據(jù)庫連接資源,從而導(dǎo)致互相等待,發(fā)生有資源搶占死鎖的問題。When a servlet/jsp is invoked, the Web container in WebSphere Application Server automatically creates an LTC context. When a connection is obtained in an LTC, the default behavior is that the connection does not return to the free pool until the LTC ends. The LTC does not end until the servlet/jsp pletes. If the servlet/jsp performs a longrunning task, the connection may remain allocated to the application for a long period of time. The effect of this is that the connection is leaked. When many connections are leaked, ConnectionWaitTimeoutExceptions may occur.This functionality makes it easy for you to find the method responsible for connection leaks by printing the stack traces for all open database connections whenever a thread throws an exception because it couldn’t get a database connection from the pool in a reasonable amount of time. 應(yīng)對(duì)策略:長(zhǎng)時(shí)間不能處理完成的SERVLET/JSP,最好不要并發(fā)進(jìn)行,應(yīng)排隊(duì)執(zhí)行。連接長(zhǎng)時(shí)間被占用(LTC Connection Occupation)典型表現(xiàn):盡管數(shù)據(jù)庫SQL語句執(zhí)行很快,但 SERVLET/JSP 本身仍未完成,則這個(gè)數(shù)據(jù)庫連接依然對(duì)其它線程失效,標(biāo)記為不可使用。(3)調(diào)整PUBSUBMIT,充分避免在提交數(shù)據(jù)庫操作異常的時(shí)候,有連接不釋放的情況發(fā)生。(B、)解決辦法:(1)使用新的MAKE工具,保證Schema數(shù)據(jù)庫底層操作不會(huì)連接泄漏。四、連接池滿(J2CError):When using a j2c, it is important to follow specific programming practices to prevent problems. Care should be taken to make sure resources are released even in exception condition. Resource exhaust may cause performance impact or even deadlock.連接泄漏(Connection Leak)中科軟LIS系統(tǒng)的經(jīng)驗(yàn)告訴我們:(A、)連接泄漏可能存在以下幾種情況:(1)schema的問題(2)PubSubmit自身連接泄漏,在某些異常處理的時(shí)候沒有釋放連接。大對(duì)象內(nèi)存溢出(Large Object OOM)In this case, there is no memory leak, but some large objects are allocated and it will increase the memory usage significantly and may cause OOM errors. So, do not forget to release the objects which will never be used in your application, especially for some large objects, it will affect the performan
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