Mysql state creating sort index
WebOct 20, 2016 · The future MySQL 8.0 will (probably) have a great new feature: support for index sort order on disk (i.e., indexes can be physically sorted in descending order). In the MySQL 8.0 Labs release (new optimizer preview), when you create an index you can specify the order “asc” or “desc”, and it will be supported (for B-Tree indexes). That ... WebJun 27, 2012 · So we have about 3.7GB total size out of which 1.4GB is the Index. First Lets look at results of Adding and Dropping column for 128M buffer pool, sized to illustrate the case of index being significantly larger than amount of memory. Blue Columns in this case is the default configuration, second is with expand_fast_index_creation=1 which builds ...
Mysql state creating sort index
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WebMar 31, 2024 · However, this query takes over 3 hours to execute, SHOW FULL PROCESSLIST shows "Creating sort index" and almost 95% of the time it is creating sort index. EXPLAIN SHOWS. Select type: DEPENDENT SUBQUERY table: hi type: index possible keys: NULL key: hst_idx_sym_date_hp key_len: 32 ref: NULL rows: 1002718 extra: Using … WebSep 25, 2009 · Я часто вижу ошибки, связанные с созданием индексов в MySQL. Многие разработчики (и не только новички в MySQL) создают много индексов на тех колонках, которые будут использовать в выборках, и считают...
WebAug 24, 2024 · 0. SELECT @@sort_buffer_size; to determine current size. Multiply the value returned by two. In your my.cnf [mysqld] section, sort_buffer_size=calculated-result. … WebIn this query, the index on (key_part1, key_part2) enables the optimizer to avoid sorting: SELECT * FROM t1 ORDER BY key_part1, key_part2;. However, the query uses SELECT *, which may select more columns than key_part1 and key_part2.In that case, scanning an entire index and looking up table rows to find columns not in the index may be more …
WebThe repair code is using a sort to create indexes. Repair done. The thread has completed a multithreaded repair for a MyISAM table. Repair with keycache. The repair code is using … WebThis in turn eats up the server resources causing everything to slow down. The query execution gets stuck in the creating sort index phase, see the attached screen shot. The …
WebSUGGESTION #3 : Bigger Key Buffer (Optional) MyISAM only uses index caching. Since the query should not touch the .MYD file, you should use a slightly bigger MyISAM Key Buffer. To set it to 256M. SET @newsize = 1024 * 1024 * 256; SET GLOBAL key_buffer_size = @newsize; Then, set it in my.cnf.
WebSep 17, 2024 · If you are a MySQL DBA for a long time (like me), it's very complicated to get rid of bad habits. One of them I really need to change is the way to retrieve the list of all the running queries (processlist). Usually, I use SHOW FULL PROCESSLIST which is very convenient, but like querying the Information_Schema, this statement has negative … mysterious english moviesWebMar 19, 2014 · MySQL Forums Forum List ... Date: March 19, 2014 04:56PM > state SENDING DATA become super slow. That "state" is essentially useless information. It is saying that the query is hard to optimize and is taking a long time. ... Creating Sort Index Slow. 4983. Rick James. March 19, 2014 04:56PM Re: Creating Sort Index Slow. 4672. mysterious fabric dofusWebApr 17, 2024 · The query is in the "sending data" state for about 128 seconds and then spends close to 2 hours in the "creating sort index" state. I've played around with different … mysterious explosion in siberiaWeb14.6.2.3 Sorted Index Builds. InnoDB performs a bulk load instead of inserting one index record at a time when creating or rebuilding indexes. This method of index creation is also known as a sorted index build. Sorted index builds are not supported for spatial indexes. There are three phases to an index build. mysterious events september 1984WebDec 5, 2016 · MySQL, SQLServer, oracle, チューニング, インデックス SQLのクエリを実行するとき、ボトルネックになりがちな演算の1つにソートがあります。 全レコードを並び替えるため、レコード数が多ければ多いほどそのコストも増大していきます。 mysterious events in science historyWebJul 11, 2024 · Very slow "creating sort index". on one of my InnoDB tables some queries are terribly slow; specifically the process hangs in 'creating sort index' for tens of minutes. The table stores values, indexed by time and various other identifiers, MySQL version is 5.7.22-0ubuntu0.16.04.1. The table is partitioned by range over the `unixtime` column ... the springs venue alvaradoWebAug 24, 2024 · 0. SELECT @@sort_buffer_size; to determine current size. Multiply the value returned by two. In your my.cnf [mysqld] section, sort_buffer_size=calculated-result. stop/start your instance and you should have reduction in CPU % used. Share. Improve this answer. Follow. mysterious eyes mp3