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this object. as a result, access by other threads to all the synchronized code parts of the object is temporarily blocked. 5. The above rules apply to other Object locks. Example: 1. When two concurrent threads access the synchronized (this) synchronization code block of the same object, only one thread can be executed within a time period. the other thread must wait until the current thread finishes executing this code block before executing this code block. Package ths; Public class thread1 i

blocked by other threads. The third example also applies to other synchronized code blocks. That is, when a thread accesses a synchronized (this) synchronization code block of object, it obtains the object lock of the objects. As a result, access to all of the synchronization code portions of the object object by other threads is temporarily blocked. The above rules apply to other object locks as well. An example is provided: First, when two concurrent threads access the synchronized (this)

Communication between threads in Java multithreading, java Multithreading1. Use the while method to implement inter-thread Communication Package com. ietree. multithread. sync; import java. util. arrayList; import java. util. list; public class MyList {private volatile static List list = new ArrayList (); public void add () {list. add ("apple");} public int size () {return list. size () ;}public static void main (String [] args) {final MyList list1 = new MyList (); Thread

Kf=read.csv (' D:/kf.csv ') # Read recovery dataKfSl=as.matrix (Kf[,1:3]) #生成生理指标矩阵Xl=as.matrix (Kf[,4:6]) #生成训练指标矩阵X=slXY=xlYX0=scale (x)X0Y0=scale (y)Y0M=t (x0)%*%y0%*%t (y0)%*%x0MEigen (M)W1=eigen (m) $vectors [, 1]V1=t (y0)%*%x0%*%w1/sqrt (As.matrix (Eigen (m) $values) [1,])V1T1=X0%*%W1 #第一对潜变量得分向量T1 # above for the first step (1) to extract the first pair of two variables group, and make it the most relevant.U1=y0%*%v1U1 #第一对潜变量得分向量Library ("PRAC

1. Sleep () Introduction Sleep () is defined in Thread.java. The function of sleep () is to let the current thread hibernate, that is, the current thread will go from "Run state" to "hibernate (blocked) state". Sleep () Specifies the time of hibernation, when the thread sleeps longer than/equal to the sleep time; When the thread is awakened, it becomes "ready" by the blocking state, which waits for the CPU's dispatch to execute. 2. Sleep () example The following is a simple example to illust

A few knowledge points about where and on conditions in the left join: 1. Multiple table LEFT join is a temporary table that is generated and returned to the user 2.where condition is filtered for the last generated temporary table, filtering out records that do not meet the Where condition. is really non-conforming on the filter out. The 3.on condition is conditional filtering on the right table of the left join, but still returns all rows from the table in the right, and the fill null 4.on

Oracle Execution Plan (3)-join base of two tables 1 formula: Base join selection rate * filter condition 1 base + filter condition 2 base join selection rate (num_rows (Table 1) -num_nulls (Table 1 connection field) num_rows (table 1) * (num_rows (table 2)-num_nulls (Table 2 connection field) num_rows (table 2 )) Oracle Execution Plan (3)-Two-table join base 1 formula: base = connection selection rate * filtering condition 1 base + filtering condition 2 base join selection rate = (num_rows (Tabl

a partition is being locked in any mode, and all of its parents be locked in ' S ' mode.Based on this, the lock acquired for a operation is as follows: Hive Command Locks acquired Select: T1 Partition P1 S on T1, T1. P1 INSERT into T2 (partition P2) Select: T1 Partit

more information.Label: mydataUUID: 54161207-74c5-4851-b945-70c510a914c1Node size: 16384Sector size: 4096Filesystem size: 4.00GiBBlock group profiles: Data: RAID0 409.50MiB Metadata: RAID1 204.75MiB System: RAID1 8.00MiBSSD detected: noIncompat features: extref, skinny-metadataNumber of devices: 4Devices: ID SIZE PATH 1 1.00GiB /dev/sdb5 2 1.00GiB /dev

. Let's take an example of a 10053 event: SQL> create table t1 as select rownum rn from dba_objects;Table created.SQL> create index ind_t1 on t1 (rn );Index created.SQL> exec dbms_stats.gather_table_stats (user, 't1', cascade => true );PL/SQL procedure successfully completed.SQL> create table t2 as select rn, 't2' name from t