多线程数据库操作
java并发编程-Executor框架
http://blog.csdn.net/shoubuliaolebu/article/details/7441811
Thread_跨节点会合查询
http://www.myexception.cn/program/1057745.html
mysql 索引
http://www.cnblogs.com/tianhuilove/archive/2011/09/05/2167795.html
c3p0
http://blog.sina.com.cn/s/blog_6c5f4d3c01012gtq.html
ForkJoinPool VS ExecutorService 实例分析
www.iteye.com/topic/1117483
差不多每1万条插入一次数据，性能最高，40秒左右。
http://hi.baidu.com/yiewgckawnlpuwe/item/80adbb9d5c263eb282d29571
MySQL五种优化插入数据表的查询方法 by cubeking
http://hi.baidu.com/cubeking/item/598abdc08b3b9225ef46651b
mysql批量提交的优化
http://hidba.org/?p=369
类 ThreadPoolExecutor
http://www.cjsdn.net/Doc/JDK50/java/util/concurrent/ThreadPoolExecutor.html
ExecutorService+FutureTask实现程序执行超时监控
http://blog.csdn.net/navy0418/article/details/6612105
JAVA多线程的控制JAVA 5.0
http://blog.sina.com.cn/s/blog_5efa347301011zk3.html
http://v.youku.com/v_show/id_XNTA5ODk4NzQ0.html
C3p0使用时出现的异常及解决方案
http://blog.csdn.net/t12x3456/article/details/7650404
c3p0存在严重bug
http://weifly.iteye.com/blog/1227182
C3P0 bug 解决办法: 关闭的连接 still in use
http://bbs.csdn.net/topics/390290277
基于多线程的数据库连接池
http://blog.csdn.net/lihao8023/article/details/4237334
快速批量插入setLocalInfileInputStream的用法
http://blog.csdn.net/nsrainbow/article/details/8206050
MySQL性能优化的最佳21条经验
http://www.csdn.net/article/2011-08-09/302869
mysql快速插入/更新大量记录
http://www.cnblogs.com/chutianyao/archive/2012/07/18/2597330.html
数据库插入百万数据
http://blog.csdn.net/godfrey90/article/details/6534980
TYPE_SCROLL_INSENSITIVE：结果集的游标可以上下移动，当数据库变化时，当前结果集不变。
ResultSet.CONCUR_READ_ONLY：指定不可以更新ResultSet
以上两个参数是在对数据库进行分页处理时用到的。
分页经验：
分页表搞起来有些麻烦，DBA也提供了很多方法，找了个办法，比较符合我的业务要求，排序取
第一次： select userid from table order by userid asc limit 10000;
下一页：这里假设上一页的第1W 的userid为504010001，如下写
select userid from table where userid>504010001 order by userid asc limit 10000;
每次传入上次最大的一个userid，这样速度就很快了，数据多大都没问题
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.Callable;
import java.util.concurrent.CompletionService;
import java.util.concurrent.ExecutorCompletionService;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import javax.annotation.Resource;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;
/**
* 多线长异步插入
*/
@Component("cacheToMysqlTaskObj")
public class CacheToMysqlTask{
Logger logger = LoggerFactory.getLogger(CacheToMysqlTask.class);
@Resource
private BarBatchDAO barBatchDAO;
private static int initThreads = 10;
private ExecutorService executorService;
private CompletionService<Object> completionService;
//每次执行的记录
private final static long exeStep = 10000;
//任务未完成，休停时间
private final static long timeStep = 1*1000;
//休停超时
private final static long stopStep = 1*60*60*1000;
//递归超时 hours
private final static int totalStep = 4;
//1000W
private final static int overRecords = 10000000;
private final static int preFixLen = Constants.TAIR_FOOTBAR_VIEW.length();
public void exeToMysqlTask() {
try{
logger.warn("import tair data to Mysql ...");
this.exeToMysqlTask(1, 10000, overRecords);
logger.warn("over ...");
if(executorService != null && !executorService.isShutdown()){
executorService.shutdown();
logger.warn("executorService shutdown ...");
}
}catch(Exception e){
logger.error("footbar mysql to tair failed:"+e);
}
}
long totalTimes = 0L;
public boolean exeToMysqlTask(long start,long end,long overRecords){
try{
long startTime = System.currentTimeMillis();
if(executorService == null || executorService.isShutdown()){
executorService = Executors.newFixedThreadPool(initThreads);
completionService = new ExecutorCompletionService<Object>(executorService);
}
long kipStart = start;
long kipEnd = end;
long kipMax = overRecords;
if(kipEnd<=0 || kipStart>kipEnd){
logger.error("执行的次数不对!");
return false;
}
if(kipEnd >= 8000000){
if(kipEnd%100000 == 0){
logger.warn("数据告警太大建议先拆分再操作!");
}
}
if(kipEnd > kipMax){
logger.warn("需处理数据 "+kipEnd+" 数据太大1000W以后的数据任务将不执行!");
return false;
}
for(int i=0;i<15;i++){
List<FootInfo> saveOrUpdateList = new ArrayList<FootInfo>();
for(;;){
//构造业务数据
saveOrUpdateList.add(footInfo);
}
if(i==10){
logger.error(i+"业务数据构造循环结束");
}
if(saveOrUpdateList.size()>0){
BatchTask task = new BatchTask(batchDAO,saveOrUpdateList);
if (!executorService.isShutdown()) {
completionService.submit(task);
}
}
}
//保证最后一笔记录执行，避免无限循环
if(kipEnd > kipMax){
kipStart = kipEnd + 1;
kipEnd = kipStart + exeStep;
logger.warn("the task finished,after 2 sec over!");
break;
}
kipStart = kipEnd + 1;
kipEnd = kipStart + exeStep;
if(kipEnd>=kipMax){
kipEnd = kipMax;
}
if (!executorService.isShutdown()){
executorService.shutdown();
}
boolean sleepKip = executorService.isTerminated();
long times = 0L;
while(!sleepKip){
Thread.sleep(timeStep);
sleepKip = executorService.isTerminated();
times += timeStep;
if(times >= stopStep){
logger.error("单次服务所有task累计执行时间超过1个小时,请排查!" + times);
executorService.shutdownNow();
break;
}
}
//times timeout exit ...
if(times >= stopStep){
logger.warn("times timeout exit ...");
return false;
}
long endTime = System.currentTimeMillis();
totalTimes += (endTime-startTime);
//递归超时
long hours = (totalTimes % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60);
if(hours >= totalStep){
logger.warn("totalTimes timeout exit: "+totalTimes+" milliseconds!");
//return false;
}
if(kipEnd < kipMax){
return exeToMysqlTask(kipStart,kipEnd,kipMax);
}
}catch(Exception e){
logger.error("foot bar tair to mysql failed:"+e);
}
return true;
}
}
class BatchTask implements Callable<Object> {
private List<FootBarInfo> list;
private BatchDAO barBatchDAO;
public BatchTask(){
}
public BatchTask(BatchDAO barBatchDAO,List<FootInfo> list){
this.list = list;
this.barBatchDAO = barBatchDAO;
}
public synchronized String call() throws Exception {
if(list != null){
barBatchDAO.batchSaveOrUpdate(list);
}
return "";
}
}
千万级插入更新，分页技巧
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.annotation.Resource;
import org.springframework.stereotype.Component;
@Component("batchDAO")
public class BatchDAO {
@Resource
private DataSource dataSource;
static StringBuffer saveOrUpdateStr = new StringBuffer();
static StringBuffer nextPageStr = new StringBuffer();
static int commitInt = 2000;
static{
saveOrUpdateStr.append("insert into foot_info (userid,siteinfo,create_time) values ");
saveOrUpdateStr.append("(?,?,now())");
//组装更新语句
for(int i=1;i<commitInt;i++){
saveOrUpdateStr.append(",(?,?,now())");
}
saveOrUpdateStr.append(" on duplicate key update siteinfo=values(siteinfo),create_time=values(create_time);");
nextPageStr.append(" select userid from foot_info ");
nextPageStr.append(" where userid >= ? ");
nextPageStr.append(" order by userid asc limit ? ");
}
/**
* 将记录更新到daogou_footbar_info表，不存在插入，存在更新siteinfo
* 单笔提交5000条
* @param footBarList
* @throws SQLException
*/
public void batchSaveOrUpdate(List<FootInfo> footList) throws SQLException{
Connection conn = null;
PreparedStatement ps = null;
try {
conn = dataSource.getConnection();
conn.setAutoCommit(false);
ps = conn.prepareStatement(saveOrUpdateStr.toString());
List<List<FootInfo>> splitList = splitList(footList,commitInt);
for(int i=0;i<splitList.size();i++){
List<FootInfo> lists = splitList.get(i);
//不够整次处理
if(lists.size()<commitInt){
StringBuffer updateTmp = new StringBuffer();
updateTmp.append(" insert into foot_info (userid,siteinfo,create_time) values ");
updateTmp.append("(?,?,now())");
//组装更新语句
for(int n=1;n<lists.size();n++){
updateTmp.append(",(?,?,now())");
}
updateTmp.append(" on duplicate key update siteinfo=values(siteinfo),create_time=values(create_time);");
ps = conn.prepareStatement(updateTmp.toString());
}
for(int j=0;j<lists.size();j++){
FootInfo foot = (FootInfo)lists.get(j);
ps.setLong(2*j+1, foot.getUserId());
ps.setString(2*j+2, foot.getSiteInfo());
}
ps.execute();
conn.commit();
}
} catch (SQLException e) {
throw new SQLException(e);
} finally{
if(ps != null){
try {
ps.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if(conn != null){
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
}
/**
* 对1000W表设计的分页
* 对userid排序，从最小记录开始查询每次limit 1W条
* 每次查询userid>上次查询的最大userid，这样解决了数据过大的分页问题，这里只做下一页的分页
* @param start
* @param step
* @return
* @throws SQLException
*/
public List<Long> getNextPage(Long start,Long step) throws SQLException{
Connection conn = null;
PreparedStatement ps = null;
ResultSet rs = null;
try {
conn = dataSource.getConnection();
ps = conn.prepareStatement(nextPageStr.toString());
ps.setLong(1, start);
ps.setLong(2, step);
rs = ps.executeQuery();
List<Long> userIds = new ArrayList<Long>();
while(rs.next()){
userIds.add(rs.getLong("userid"));
}
return userIds;
} catch (SQLException e) {
throw new SQLException(e);
} finally{
if(rs != null){
try {
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if(ps != null){
try {
ps.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if(conn != null){
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
}
public static <T> List<List<T>> splitList(List<T> list, int pageSize) {
List<List<T>> listArray = new ArrayList<List<T>>();
if(list != null && list.size()>0){
int listSize = list.size();
int page = (listSize + (pageSize-1))/ pageSize;
for(int i=0;i<page;i++) {
List<T> subList = new ArrayList<T>();
for(int j=0;j<listSize;j++) {
int pageIndex = ( (j + 1) + (pageSize-1) ) / pageSize;
if(pageIndex == (i + 1)) {
subList.add(list.get(j));
}
if( (j + 1) == ((j + 1) * pageSize) ) {
break;
}
}
listArray.add(subList);
}
}
return listArray;
}
}
MysqlSequence
import java.util.concurrent.atomic.AtomicLong;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
import javax.annotation.Resource;
import org.springframework.stereotype.Service;
import com.google.common.base.Preconditions;
import com.google.common.base.Strings;
@Service("sequenceImpl")
public class MysqlSequence implements Sequence {
private int rangeStep = 1000;
private volatile AtomicLong sequence = new AtomicLong(-1);
private final Lock lock = new ReentrantLock();
private String sequenceName="";
private volatile long seqEndPoint ;
@Resource
private SequenceDao sequenceDao ;
private int defaultTryTime = 100;
@Override
public long nextValue(String sequenceName) throws Exception {
int tryTime = defaultTryTime;
for (;;) {
if (tryTime < 0) {
throw new IllegalStateException("try too many times,maybe the database crashed!");
}
tryTime--;
if (sequence.get() == -1L) {
lock.lock();
try {
if(sequence.get() == -1L) {
Long expectValue = sequenceDao.getSequnceNumber(sequenceName);
boolean ret = sequenceDao.getAndIncrement(sequenceName, rangeStep,expectValue);
if(!ret) continue;
sequence.set(expectValue);
seqEndPoint = sequence.get() + rangeStep;
}
} finally {
lock.unlock();
}
}
lock.lock();
try {
if(sequence.get() >= seqEndPoint) {
sequence.set(-1L);
continue;
}
return sequence.incrementAndGet();
} finally {
lock.unlock();
}
}
}
public void setRangeStep(int rangeStep) {
Preconditions.checkArgument(rangeStep>=100,"rangeStep must large than 100!");
this.rangeStep = rangeStep;
}
public String getSequnceName() {
return sequenceName;
}
public void setSequnceName(String sequenceName) {
Preconditions.checkArgument(!Strings.isNullOrEmpty(sequenceName),"sequnceName is not allow null!");
this.sequenceName = sequenceName;
}
public void setDefaultTryTime(int defaultTryTime) {
this.defaultTryTime = defaultTryTime;
}
}