batch-insert

问题 I'm using jdbcTemplate to Batch-Insert into 2 tables. The 1st table is easy, and has an ID . The 2nd table has an FK Reference USER_ID which I need to obtain from Table 1 before inserting. Suppose I have this: Main Java Code (here I split up into batches <= 1000) for(int i = 0; i < totalEntries.size(); i++) { // Add to Batch-Insert List; if list size ready for batch-insert, or if at the end, batch-persist & clear list batchInsert.add(user); if (batchInsert.size() == 1000 || i == totalEntries

问题 I am trying to insert 100,000 rows in a MYSQL table under 5 seconds using Hibernate(JPA). I have tried every trick hibernate offers and still can not do better than 35 seconds. 1st optimisation : I started with IDENTITY sequence generator which was resulting in 60 seconds to insert. I later abandoned the sequence generator and started assigning the @Id field myself by reading the MAX(id) and using AtomicInteger.incrementAndGet() to assign fields myself. That reduced the insert time to 35

问题 I am trying to insert 100,000 rows in a MYSQL table under 5 seconds using Hibernate(JPA). I have tried every trick hibernate offers and still can not do better than 35 seconds. 1st optimisation : I started with IDENTITY sequence generator which was resulting in 60 seconds to insert. I later abandoned the sequence generator and started assigning the @Id field myself by reading the MAX(id) and using AtomicInteger.incrementAndGet() to assign fields myself. That reduced the insert time to 35

问题 I am trying to batch insert 100k+ items to my Oracle db using ADO.NET inside a TransactionScope. Like this: using (TransactionScope transaction = new TransactionScope()) { while(/* Pagination logic - send insertion command on every 250 items */) { using (OracleCommand command = new OracleCommand(query, connection)) { command.ArrayBindCount = 250; //Add parameters command.Parameters.Add(":BLAH", OracleDbType.Long); command.Parameters[0].Value = LUC.ToArray(); command.ExecuteNonQuery(); //Error

问题 What is the most efficient way of inserting multiple rows in cassandra column family. Is it possible to do this in a single call. Right now my approach is to addinsert multiple column and then execute. There in a single call I am persisting one row. I am looking for strategy so that I can do a batch insert. 回答1: CQL contains a BEGIN BATCH...APPLY BATCH statement that allows you to group multiple inserts so that a developer can create and execute a series of requests (see http://www.datastax

问题 I want to implement a sql query using CodeIgniter Active Record class. The query looks like this.. INSERT california_authors (au_id, au_lname, au_fname) SELECT au_id, au_lname, au_fname FROM authors WHERE State = 'CA' Is this possible in CodeIgniter without using the $this->db->query method? Solution : $this->db->select('au_id, au_lname, au_fname'); $this->db->from('california_authors'); $this->db->where('state', 'CA'); $query = $this->db->get(); if($query->num_rows()) { $new_author = $query-

问题 I am inserting many records using JDBC batch inserts. Is there any way to get the generated key for each record? Can I use ps.getGeneratedKeys() with batch inserts? I am using oracle.jdbc.OracleDriver final String insert = "Insert into Student(RollNumber, Name, Age) values(StudentSEQ.nextval, ? , ?)"; final int BATCH_SIZE = 998; int count = 0; Connection con = null; PreparedStatement ps = null; try { con = getConnection(); ps = con.prepareStatement(insert); for (Student s : students) { ps

问题 Can some one explain me how hibernate.jdbc.batch_size=1000 and if (i % 100 == 0 && i>0) { session.flush(); session.clear(); } together works ? ... 回答1: Hibernate property hibernate.jdbc.batch_size is a way for hibernate to optimize your insert or update statetment whereas flushing loop is about memory exhaustion. Without batchsize when you try to save an entity hibernate fire 1 insert statement, thus if you work with a big collection, for each save hibernate fire 1 statement Imagine the

问题 I am fresh to Codeigniter. I have a form which looks something like this. <tr> <td><input type="text" name="Name[0]" value=""></td> <td><input type="text" name="Address[0]" value=""><br></td> <td><input type="text" name="Age[0]" value=""></td> <td><input type="text" name="Email[0]" value=""></td> </tr> <tr> <td><input type="text" name="Name[1]" value=""></td> <td><input type="text" name="Address[1]" value=""><br></td> <td><input type="text" name="Age[1]" value=""></td> <td><input type="text"

问题 Our Java Application doing a batch inserts on 1 of the table, That table schema is something like.. CREATE TABLE "My_KeySpace"."my_table" ( key text, column1 varint, column2 bigint, column3 text, column4 boolean, value blob, PRIMARY KEY (key, column1, column2, column3, column4) ) WITH CLUSTERING ORDER BY ( column1 DESC, column2 DESC, column3 ASC, column4 ASC ) AND COMPACT STORAGE AND bloom_filter_fp_chance = 0.1 AND comment = '' AND crc_check_chance = 1.0 AND dclocal_read_repair_chance = 0.0