trx_try_wait_lock_timeout unit_balance_resource_weight use_large_pages user_block_cache_priority user_iort_up_percentage user_row_cache_priority user_tab_col_stat_cache_priority virtual_table_location_cache_expire_time wait_leader_batch_count weak_read_version_refresh_interval workers_per_cpu_quot...
This optimization is effective on all CPU architectures that have a cache per CPU, because MESI is so widespread. On Hyper-Threading CPUs, pausing with rep nop gives additional performance by hinting the core that it can work on the other thread while the lock spins waiting.[2] Transactional...
从vmstat来看,CPU使用不大,而IO也在可以接受的范围内(vmstat wa%不高且b列为0)如下: vmstat--- procs ---memory--- ---swap-- ---io--- -system-- ---cpu--- r b swpd free buff cache si so bi boincs us syidwa st 2 0 927300 3057100 0 53487316 0 0 5 192 0 0 3 1 96 0 0...
In OceanBase Database V4.x, you can use theha_high_thread_scoreparameter to specify the number of worker threads for high-availability high-priority tasks such as replication, rebuild, and restore tasks. For more information about the tenant-level parameterha_high_thread_score, seeha_high_thre...
1 row updated. SQL> The lock on the Banda row is now released, so transaction 2 proceeds with its update to the salary for Banda. SQL> SELECT last_name, salary FROM employees WHERE last_name IN ('Banda','Greene','Hintz'); LAST_NAME SALARY --- --- Banda 6300 Greene 9900 Hint...
enable_early_lock_release enable_rereplication enable_rich_error_msg enable_rootservice_standalone enable_sql_audit enable_sql_operator_dump enable_async_syslog enable_syslog_recycle enable_syslog_wf enable_upgrade_mode enable_separate_sys_clog enable_ddl enable_major_freeze enable_rebuild_on_purpose ...
Total number of lock structs in row lock hash table 45 LIST OF TRANSACTIONS FOR EACH SESSION: ---TRANSACTION 6 4175809385, not started, OS thread id 8877 mysql tables in use 1, locked 0 MySQL thread id 1087691, query id 23588838 ls185.x.y 192.168.0.185 root select it_name,it_...
767 lock struct(s), heap size 106968, 212591 row lock(s), undo log entries 15451 MySQL thread id 14, OS thread handle 140736751912704, query id 1077 localhost root Sending data insert into testui select * from testui ---TRANSACTION 162302, ACTIVE 320 sec, thread declared inside InnoDB 1...
also that the EXCLUSIVE lock that the writer obtained in order to write to the database initially must be held until all changes are committed. That means that no other processes are able to access the database from the time the memory cache first spills to disk until the transaction ...
Hibernate does not lock objects in memory. Your application can expect the behavior as defined by the isolation level of your database transactions. Through Session, which is also a transaction-scoped cache, Hibernate provides repeatable reads for lookup by identifier and entity querie...