MySQL Cluster : MySQL's Distributed Database

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Mysql cluster fast inserts but slow selects

I have a mysql cluster with 3 Data Nodes and one SQL node. Curently I have 1million 1kb records. The inserts are very fast, takes only a few ms. But the selects are very slow >20s. All machines are ...
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208 views

All four data nodes in MySQL Cluster in same node group

I am testing MySQL Cluster 7.2. I have two servers, mysql1 and mysql2. I want the management server and two data nodes to run on mysql1 and two other data nodes to run on mysql2. My config.ini file ...
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MySQL cluster DataMemory and DiskPageBufferMemory parameters

I want to setup a MySQL cluster. The amount of data is more than double the amount of RAM. I have 3 Data Nodes each with 8GB RAM. QUESTIONS What is a good rule for the DataMemory and ...
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71 views

mysql cluster table full error

I installed a new mysql cluster on windows (for evaluation). I created a table using command below. After I insert just over 1 million records into the table it gives me the "table datadump is full" ...
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MySQL cluster concurrency

I have a little application that executes select queries against a MySQL cluster. By using 1 thread to read a record the latency is x. By using 2 threads to read records concurrently the avg latency ...
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Creating a database redundancy based on Mysql

I have this requirement where my web application running on a tomcat is behind a loadbalancer and I am planning to deploy this application on multiple servers. This webapp though needs a database ( ...
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217 views

How to removing or reduce the size of redo logs in MySQL cluster

Can anybody tell me that how can we reduce the redo log file size or can we remove the redo log file size in MySQL Cluster and also what will be the impact of it on performance of cluster.Also can we ...
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511 views

MySQL Cluster LOAD DATA too slow

mysql-5.5.22 ndb-7.2.6 cluster 64bit running on Centos 6 with each node installed on the same Citrix Xen Server communicating via a virtual private network. Each node has 4GB of RAM, 4 vCPUs and 10GB ...
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Delete operation mysql cluster

I am trying to delete some entries from table on a cluster and I get this error ERROR 1297 (HY000): Got temporary error 233 'Out of operation records in transaction coordinator (increase ...
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Error in alter table reorganize partition for MySQL Cluster

My cluster contains 48 million rows and cluster contains 4 storage nodes . After that I add online storage node and executed alter table 'customer_tbl' reorganize partition. Some parameters of ...
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memcached+mysql cluster maximum memory

I'm deploying a system with memcached and mysql cluster. The command line is: memcached -E lib/ndb_engine.so -e "connectstring=maddy:1186;role=dev" I can't specify the -m argument since I used -E ...
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MySQL cluster stuck in start phase 4, how to proceed?

Over the weekend our cluster we set up for evaluation had one of its data nodes lose network connectivity briefly. This was while another data node was in the middle of a restart (which had been going ...
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Does MariaDB-Galera Cluster support LAST_INSERT_ID and mysql_info?

As far as I understand, Galera does not support table locking, but what information can be retrieved about the last query? LOCK/UNLOCK TABLES cannot be supported in master-master replication. Lock ...
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14 views

Altering NOT NULL column in offline table

Regarding the MySQL Cluster documentation we are not allowed to modify a column to NOT NULL on ONLINE tables. i.e. ALTER TABLEfoo_barMODIFY COLUMNbazdecimal(11,8) NOT NULL Our hosting provider tells ...
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Upgrade 2 servers with master-master replication without data loss

We have two MySQL servers running with master-master replication in a Pacemaker cluster. If a database operation should be done, the primary server is asked first to do the job, if it fails, the ...
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Why so much traffic between SQL Node and Data Node?

For a MySQL cluster I use one SQL Node and two DataNodes. On one Data Node I have started the linux command tcpdump and have observed the communication between the SQL and Data Node while I have ...
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Maximum number of records in MySQl NDB

I have a MySQL cluster table that consist of 1 primary key int (32) and 10 varchars of size 100. I use disk data tables. I have three data nodes with together 22GB RAM. How many records can I store ...
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23 views

MySQL cluster with RAID0

I use several EC2 (M1.LARGE) instances with ephemeral storage. Would RAID0 improve write and read performance? I'am only interested in performance. Has someone experience? Is the speedup=2??
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MySQL cluster performance very poor on Amazon

We have currently a project running where we need to store 1 to 20,30 million 500B to 2kB records. We need to use MySQL cluster on 4 EC2 instances (8GB Ram, 2 cores) and ephemeral storage (Records ...
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53 views

Can I have a Distributed Database in which one database is MariaDB and the other one is MySQL Cluster?

This is a hypothetical question of course, I just want to know, because that's one of the question i'm going to be asked in my presentation and I have a feeling that the answer is "yes" after all my ...
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What does “Remove fully qualified host names from /etc/hosts and use these in config.ini for all clusters hosts” means?

Caution You cannot mix localhost and other host names or IP addresses in config.ini. For these reasons, the solution in such cases (other than to use IP addresses for all config.ini HostName ...
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218 views

Cannot start MySQL cluster with single node

For some testing I have installed MySQL Cluster. I can get it to work with configuration suggested in Lunix guick start guide. My configuration: [ndb_mgmd] hostname=localhost ...
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70 views

ERROR while doing coalesce partition Mysql Cluster

My table contains 3299000 rows. My Mysql Cluster contains 2 storage nodes with NoOfReplicas=2. By default it contains 2 partitions and after that i added 3 partitions more one by one using command ...