scn计算方法:SCN=(SCN_WRP * 4294967296) + SCN_BAS 在Oracle内部,SCN分为两部分存储,分别称之为scn wrap 高16位和scn base 低32位 如:scn: 0x0000.0097a48a===》6个byte 48 bit=2byte(SCNWRAP)+4byte(SCNBASE) 因为kscnbas占4个byte,所以2的32次方(4*8) = 4294967296,所以scn = (SCN_WRP * 4...
SQL> select current_scn from v$database; CURRENT_SCN --- 8910961765230 我们看到current_scn的查询会直接导致SCN的增进,而其他方式并不会。也就是说在这里的current_scn就像是一个Sequence一样,查询会导致增进。这也很好理解,v$database只能通过增进当前的SCN才能保证获得的SCN是Current的。可是如果不查询呢?这个...
我们知道Oracle10g在v$database视图中引入了current_scn,这个SCN来自底层表,代表当前的SCN,在Oracle9i中我们可以通过dbms_flashback.get_system_change_number来获得系统的SCN。 但是注意current_scn还是有所不同的,我们看一下一个查询: [oracle@danaly ~]$ sqlplus '/ as sysdba' SQL*Plus: Release 10.2.0.1.0 ...
If the SCN is less than the dependent SCN then we signal the ORA-600 [2662] internal error. ARGUMENTS: Arg [a] Current SCN WRAP Arg [b] Current SCN BASE Arg [c] dependent SCN WRAP Arg [d] dependent SCN BASE Arg [e] Where present this is the DBA where the dependent SCN came fro...
Oracle Database - Enterprise Edition - Version 10.2.0.1 to 10.2.0.5 [Release 10.2]: CURRENT_SCN from v$database not showing the correct value in physical standby DB
来自网络,并且在本机实验完成: onsistent read :我的理解,就是通过scn来读取。 读取的过程中要保证 scn是一致的。举个例子,一个SELECT 语句在SCN=100的时刻开始读取一系列数据块。在执行的过程中,他发现一个数据块的SCN变成了101,也就是说这个数据块被更改过了。那么
SCNActionable_Extensions SCNActionNodeWithElapsedTimeHandler SCNActionTimingMode SCNAnimatable SCNAnimatable_Extensions SCNAnimatableExtensions SCNAnimation SCNAnimationDidStartHandler SCNAnimationDidStopHandler SCNAnimationEvent SCNAnimationEventHandler SCNAnimationImportPolicy SCNAnimationPlayer SCNAntialiasingMode SCNAudio...
Neurosci. 18 (1998) 5234–5239]). Thus, the presence or absence of resurgent current, and of persistent sodium current, appears to depend on cellular factors other than the mere presence of the Scn8a transcript. 展开 关键词:Resurgent current Scn8a Sodium channel Spinal motoneuron ...
3)设置current SCN最小起始值(1表示1*230) Set "*._minimum_giga_scn=1" in init.ora 4)修改实例的Global Lamport SCN,在SGA中由kcsgscn变量存储 1.oradebug setmypid 2.oradebug DUMPvar SGA kcsgscn 3.ORADEBUG POKE 0x060012658 4 0xfffff ...
Hello everyone, I have the same question as the question posted inthis thread. I've been searching and searching to find a way to change the current time of an SCNParticleSystem so that I can render it offscreen into a video that I'm making. Since the video frames are rendered asynchro...