监控 SQL 1.监控事例的等待： select event,sum(decode(wait_time,0,0,1)) prev, sum(decode(wait_time,0,1,0)) curr,count(*) from v$session_wait group by event order by 4; 2.回滚段的争用情况： select name,waits,gets,waits/gets ratio from v$rollstat a,v$rollname b where a.us
Overview In computer-based data acquisition applications, data incoming or outgoing through computer I/O devices must often be managed at high speeds or in large quantities. The three primary data transfer mechanisms for computer-based data acquisit
Java Language Specification Third Edition ========================================= 1 Introduction 1.1 Example Programs 1.2 Notation 1.3 Relationship to Predefined Classes and Interfaces 1.4 References 2 Grammars 2.1 Context-Free Grammars 2.2 The Le
Task Structure –Detailed Explanation (contd.) •MMI Task Routines –Waits for messages sent to the MMI queue. –Messages in this queue are put by the Protocol Stack. –Framework Layer processes the events. –Framework Layer triggers callbacks to the appl
oracle的圣经--《旧约》。 Based on Oracle8i, release 8.1, this concise book contains detailed, hard-to-find information about Oracle internals (data structures, algorithms, hidden parameters, and undocumented system statistics). Main topics include waits, la
Welcome to the VBscr ipt Language ReferenceThese handy blocks of information will help you explore the many different parts of the Visual Basic scr ipting language.You'll find all the parts of the VBscr ipt language listed alphabetically under the A
