restore_concurrency 用于设置从备份恢复租户数据时的最大并发度。 属性描述 参数类型整型 默认值0,表示使用系统默认值,默认为当前 OBServer 节点的 CPU 核数 取值范围[0, 512] 是否重启 OBServer 生效否 配置示例 设置系统从备份中恢复租户数据时的最大工作线程数为 8。
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...
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...
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 ...
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...
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...
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_...
--alter-lock=NONE default: all --alter-redo-log Alter instance enable/disable redo log default#: 0 --alter-table-compress Alter table compression --alter-table-compress=50 default#: 10 --alter-table-encrypt Alter table set Encryption --alter-table-encrypt=50 default#: 10 --alt-tbs-enc ...
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 ...