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Artem - > |THREAD_ID LOCK_MODE LOCK_DURATION LOCK_TYPE TABLE_SCHEMA > TABLE_NAME > 268871 MDL_INTENTION_EXCLUSIVE MDL_EXPLICIT Global read lock > 270022 MDL_INTENTION_EXCLUSIVE MDL_STATEMENT Global read lock > 268871 MDL_SHARED_NO_READ_WRITE MDL_EXPLICIT Table metadata lock > spru searchsobjects > 268871 MDL_SHARED_NO_READ_WRITE MDL_EXPLICIT Table metadata lock > spru searches > 268871 MDL The MySQL Performance Schema is a feature for monitoring MySQL Server execution Pre-filtering is done by the Performance Schema and has a global effect that wait/io/file/myisam/log wait/io/file/mysys/charset wait/lock/table/sql/ h Prior to MySQL 5.7, it is not possible to figure out table level or global read locks held by each sessions. As of MySQL 5.7, a new performance schema table, Jan 22, 2020 The rate of schema object synchronization is throttled to avoid any significant performance overhead. mysql> SET GLOBAL ndb_metadata_check = ON; In the NDB Cluster 7.x implementation, a global lock is taken whi Active metadata locks. LOCK_TYPE, One of Global read lock , Schema metadata lock , Table metadata lock , Stored function metadata lock , Stored procedure Mar 1, 2018 Table METADATA LOCKS. • Which thread is waiting for a lock. • Which thread holds the lock.

Mysql global schema lock

The data_locks table has no columns corresponding to LOCK_SPACE, LOCK_PAGE, or LOCK_REC. The INNODB_LOCKS table requires the global PROCESS privilege. The data_locks table requires the usual Performance Schema privilege of SELECT on the table to be selected from. mysql> select * from performance_schema.data_locks\g ***** 1. row ***** engine: innodb engine_lock_id: 139664434886512:1059:139664350547912 engine_transaction_id: 2569 thread_id: 46 event_id: 12 object_schema: test object_name: t1 partition_name: null subpartition_name: null index_name: null object_instance_begin: 139664350547912 lock_type MySQL Forums Forum List Waiting for ndbcluster global schema lock.

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For reference, the minimum Reference information for Aurora MySQL. Doesn't apply to clusters that are part of an Aurora global database. events, see Performance Schema instrument naming conventions in the MySQL documentation. For more information ab I'm considering using Cockroach for a globally distributed application that MySQL locks the whole database when changing a schema and Apr 24, 2012 with below error) *mysql> create schema test3; 120424 22:00:20 [Warning] NDB: Could not acquire global schema lock (4009)Cluster Failure Apr 21, 2016 An alter table command in MySQL is very expensive.

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Clearly the transaction above holds a lock, because the transaction is still active. But no query is going on right now and nobody is waiting for a lock anywhere (yet at least). INFORMATION_SCHEMA.INNODB_LOCKS is empty, which makes sense given the … 2009-07-11 We managed to get the cluster up and running by reducing the number of nodes. With 44 data nodes (22x2, 1 less than the initial setup) and 84 API nodes (21x4, 3 less than the initial setup) the cluster works fine.

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row ***** OBJECT_TYPE: TABLE OBJECT_SCHEMA: performance_schema OBJECT_NAME: metadata_locks OBJECT_INSTANCE_BEGIN: 395624368 LOCK_TYPE: SHARED_READ LOCK_DURATION: TRANSACTION LOCK_STATUS: GRANTED SOURCE: sql_parse.cc:5542 OWNER_THREAD_ID: 21 OWNER_EVENT_ID: 14 1 row in set (0.00 sec) • Re: Global read lock on delete: Artem Kuchin: 9 Dec • Re: Global read lock on delete: shawn l.green: 9 Dec • Re: Global read lock on delete: Artem Kuchin: 9 Dec • Re: Global read lock on delete: shawn l.green: 9 Dec • Re: Global read lock on delete: Laurynas Biveinis: 10 Dec • mysql dump global read lock: Artem Kuchin: 17 Dec This is the MySQL Performance Schema extract from the MySQL 5.7 Reference Manual. For legal information, see the Legal Notices. For help with using MySQL, please visit the MySQL Forums, where you can discuss your issues with other MySQL users.
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June 11, 2009 02:33PM Re: Waiting for ndbcluster global schema lock. This includes the global level lock, but its lock type is INTENTION_EXCLUSIVE. This means that LOCK TABLES t WRITE and FLUSH TABLES WITH READ LOCK will conflict each other. The second row is a schema level lock, which will block ALTER DATABASE command until the table-level lock is released. The third row indicates the table lock.