Questions tagged [myisam]

MyISAM is the non-transactional storage engine for MySQL. It provides high-speed storage and retrieval, as well as fulltext searching capabilities. In addition, it is the default storage engine type for versions of MySQL prior to 5.5.

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Safe method to rename a crashed myisam table

I have a large MyISAM table which has crashed. Repairing the table will take some time. The table only INSERTed to and SELECTed from, never updated. To allow the application to continue working, ...
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591 views

Mysql MyIsam tables get corrupted

I am facing the myisam tables get Corrupted frequently but I don't know exact root-cause for this problem. However I will do Repair/MyIsamchk --auto-repair whenever the table gets corrupted. Please ...
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MySQL MyIsam Compressing tables

Im packing big MyISAM tables with myisampack and came up with the following issue. (MariaDB 10.1.14 64bit windows) Indexes are rebuilt after packing the tablewhile running myisamchk -rq, so, it doesnt ...
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599 views

Repair by Sort not working

I am trying to import a .sql file which has MyISAM engine, about 51 million rows with 18 columns. The file has 1 primary and 1 unique key. I have after lurking around this site and reading mysql ...
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451 views

Can't import .sql file

I have a 1.4GB .gz backup file(which is 8GB unzipped) I have to import to the server but it isnt working whatever method I have tried. 1st I tried Workbench, after 2 days and still no progress I ...
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786 views

MYISAM can't create table: Row size too large

We are having database in MySQL 5.1, we have taken the DB backup from MySQL 5.1 and trying to restore in MySQL 5.6. We are getting below error: ERROR 1118 (42000) at line 603: Row size too large. ...
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715 views

Fulltext Search Doesn't Match a Hashtag

We maintain a table that looks like this to perform search queries on our forums database. I'll draw your attention to the FULLTEXT columns: CREATE TABLE `forums_posts_search` ( `post_id` bigint(20)...
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831 views

CREATE OLAP server

I have a MySQL database server along with replication server, i.e. OLTP system altogether. As I have very heavy data fetching queries for the decision making reports. I need to create data-ware house ...
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123 views

Will 'sleeping' connections open files other than the socket in MySQL?

Recently, in our MySQL replication setup, the replication slave crashed due to 'too many open files' error. We brought it backup, but trying to figure out what caused the unexpected hike in the number ...
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2answers
259 views

Heavy load causing MySQL Slave threads to remain “locked” or “Sending data” indefinitely

We have been rapidly adding MySQL servers as slaves to our master database server to help alleviate a massive increase in search (read-only) traffic to our web service. This past week, I was tasked ...
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181 views

Change Storage Engine on Referenced Tables

i need to change storage engine from 'InnoDB' to 'MyISAM' on some tables of different databases. So i made a script file to do so: #!/bin/bash DATABASES=$(mysql -u XXXXX -pXXXXX --skip-column-names -...
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Can I extrapolate from the progress reporting in MyISAM ALTER?

I'm migrating a 300 million row MyISAM table to add some indexes. Just because it might be relevant, here's my ALTER statement: ALTER TABLE my_table ADD UNIQUE INDEX my_table_abcd (a, b, c, d), ...
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Slow queries while using views in MySQL

We have MyISAM tables on MySQL 5.5 and there is this select * from theView where serial_number = 'QWE12345' or select * from theView where user_id = 1234 kind of queries when searching. When I ...
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I have changed table engines from MyISAM to Aria, should I change the database engine too?

I have changed all tables in my mariadb database from MyISAM to Aria (using adminer as tool), but the database engine is still shown as InnoDB. Should I change this to Aria, too? I did not choose ...
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moving binary database folder is causing issues with innodb tables

so I have a mix of myisam and innodb tables on a database. (its a pretty big db 30gb) I copied the folder of the database from one server to the next /var/lib/mysql/databasename well the myisam tables ...
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Benchmarking MyISAM vs InnoDB using Sysbench on MariaDB-10.0.14

I performed a "read" benchmark on MariaDB-10.0.14 db server using sysbench to compare performance between InnoDB and MyISAM on a single. Below are the sysbench commands i used: Create test table in ...
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2answers
566 views

MySQL thousands connections after convert MyISAM to InnoDB on fail-over structure

I've acquired a fail-over structure and I migrated my databases to new structure converting all tables of my database from MyISAM to InnoDB engine, but, after import all databases, I have a problem ...
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67 views

I'm building up a large MyISAM table from a few dumps. The first 21GB took less than 10 hrs total. The next 5GB is forecasted to take two months

I had a couple machines building up identical MyISAM tables. I've dumped all of those tables to a few files, and am now trying to restore them all into a single table on my own machine. The first ...
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129 views

MyISAM InnoDB performance

MyISAM vs InnoDB I keep reading how InnoDB is faster than MyISAM. I wanted to find out myself. When I was using a forloop in PHP to fill my MySQL test database with 100,000 numbers using PDO driver. ...
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2answers
4k views

How to configure my.cnf for Mysql 5.1, which is using too much CPU?

I am new Database engineer. I am having trouble in my server which is using too much CPU on database query(simple count statement). I have googled about it, so i found out it depends on system ...
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2k views

How to recover a crashed MyISAM table which myisamchk couldn't recover?

We take db backup by stopping the database and then issuing a tar -zcf on the mysql data directory. When we restore the data directory on another machine and try to start the slave, the mysql error ...
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247 views

What are the steps to change tables engines from MyISAM to InnoDB?

I have a Datebase with 10MB size . The Tables' engines were MyISAM (table-lock level). So I deiced to change them to InnoDB (row-lock level). I used the sql query for each table : ALTER TABLE t ...
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603 views

Improve Speed of MySQL Database Import

I'm importing around 44 GB (14 million rows) of information into an InnoDB MySQL database, and I'd like to do so in a reasonable timeframe. Since I'm doing this on a personal computer, I only have 8 ...
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87 views

Reinsert data in new table with new IDs

I have the following two tables: buynsell CREATE TABLE `buynsell` ( `id` VARCHAR(20) NULL DEFAULT NULL, `msg` VARCHAR(255) NULL DEFAULT NULL, `date` VARCHAR(25) NULL DEFAULT NULL, `...
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MySQL: optimal configs / methods for ALTER of large MyISAM table to InnoDB (17gb+) [duplicate]

I have a large MySQL (5.1) MyISAM table (13gb table, 4GB indexes - 40mm+ records) I'm going to be converting this table to InnoDB in a production environment. The DB is on a cloud server with 8GB ...
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2answers
651 views

Alter auto-increment of table with 16 million rows

Learned this the hard way. Need to alter a table's auto-increment with 16 million rows. Now, it's taking quite sometime. Any estimate how long it would take? Sorry.
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214 views

Website down with 3,000 concurrent user 4Gb Memory Dedicated Server (myIsam - MySQL) [closed]

Our site has 3,000+ concurrent users when we open our registration on our website. The site was too slow and get the server down sometime, even sub accounts websites are down. Free memory was 400MB. ...
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1answer
121 views

Table metadata lock MariaDB

I'm having serious problems in a DB, where a "Waiting for table level lock" box is loitering and locks the whole system: Based on some research, when the problem occurred to get the command "SELECT * ...
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1answer
44 views

Can I tweak Mysql [buffer?] variables to speed up indexes building?

I have disabled indexes updates with alter table my_table disable keys to speed up inserts Are there variables I can set [for the session] to speed up indexes rebuilding with alter table my_table ...
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1answer
359 views

restoring MySQL MyISAM table from files

0 down vote favorite We have damaged disks on the server and partially lost data. Backup of the database was not the most relevant, so it was decided to restore the database from the .myd, .myi, .frm ...
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20 views

Using xtrabackup backup to recover MyISAM data

Why do I have a ibdata1 file when backing up MyISAM data? I don't have a InnoDB table. I can't find anything about recovering MyISAM data on the official website. How Do Irestore a single backup of ...
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794 views

How important is InnoDB versus MyISAM? [duplicate]

Does it really matter if the default storage engine is InnoDB? My default storage engine is MyISAM
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6k views

Why does MATCH (FullTextSearch) AGAINST ('*' IN BOOLEAN MODE) return nothing?

MATCH (FullTextSearch) AGAINST ('k*' IN BOOLEAN MODE) return something Namely anything with a word that start with k MATCH (FullTextSearch) AGAINST ('ku*' IN BOOLEAN MODE) return less MATCH (...
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1answer
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How can we migrate Data with MySQL 5.1 - MyISAM to another server with MySQL 5.6 - InnoDB

Currently we have a MySQL 5.1 - MyISAM database on a physical server. We need to move it to another server with MySQL 5.6 - InnoDB at another location. DB size is quite large - 210GB Can someone ...

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