[英]JDBC Batch executing extremely slow
Can anyone tell me what I'm doing wrong I'm executing 350 inserts in a mysql and it's taking like 40 secs. 谁能告诉我我在做什么错,我正在mysql中执行350次插入操作,大约需要40秒钟。
Here is the code 这是代码
long t0 = System.currentTimeMillis();
Connection con = connectionProvider.getConnection();
PreparedStatement s = con.prepareStatement("insert into domkee.friends(idFriends,friend1Id,friend2Id,friend2Name) values(?,?,?,?)");
con.setAutoCommit(false);
for (Friend f : friends) {
s.setLong(1, 0);
s.setLong(2, f.getFriend1Id());
s.setLong(3, f.getFriend2Id());
s.setString(4, f.getFriend2Name());
s.addBatch();
}
long t1 = System.currentTimeMillis() - t0;
s.executeBatch();
long t2 = System.currentTimeMillis()-t0;
con.commit();
long t3 = System.currentTimeMillis()-t0;
s.close();
con.close();
long t4 = System.currentTimeMillis()-t0;
System.out.println(((double)t1/1000) + ";" + ((double)t2/1000) + ";" + ((double)t3/1000) + ";" + ((double)t4/1000));
and here is the console: 这是控制台:
0.156;39.251;39.376;39.486
So the .executeBatch()
is taking like 40 secs, what could be the problem? 因此.executeBatch()
需要40秒,这可能是什么问题?
Add ?rewriteBatchedStatements=true
to the end of your JDBC url. 将?rewriteBatchedStatements=true
添加到JDBC URL的末尾。 It'll give you a serious performance improvement. 它会给您带来严重的性能提升。 Note that this is specific to MySql, won't have any effect with any other JDBC drivers. 请注意,这特定于MySql,对其他任何JDBC驱动程序均无效。
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