oceanbase 常用视图查询记录

测试环境：1-1-1 OceanBase 企业版3.2.4.4

查看集群详细信息

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SELECT
    zone,
    concat(svr_ip, ':', svr_port) observer,
    cpu_capacity,
    cpu_total,
    cpu_assigned,
    cpu_assigned_percent,
    mem_capacity,
    mem_total,
    mem_assigned,
    mem_assigned_percent,
    unit_Num,
    round(`load`, 2) `load`,
    round(cpu_weight, 2) cpu_weight,
    round(memory_weight, 2) mem_weight,
    leader_count
    FROM __all_virtual_server_stat
    ORDER BY zone,svr_ip;

查看租户的 Context 和 Modudle 内存

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SELECT
tenant_id,
svr_ip,
ctx_id,
ctx_name,
mod_name,
count,
round(HOLD / 1024 / 1024, 2) hold_mb,
round(used / 1024 / 1024, 2) used_mb
FROM
oceanbase.__all_virtual_memory_info
WHERE
tenant_id = 1
ORDER BY used DESC
LIMIT 10;

查看租户 memstore 内存使用情况

V3 版本用视图 gv $memstore V4 该视图变成了gv$ ob_memstore

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SELECT
  tenant_id,
  ip ,
  round(active / 1024 / 1024, 2) active_mb,
  round(total / 1024 / 1024, 2) total_mb,
  round(freeze_trigger / 1024 / 1024, 2 ) freeze_trg_mb,
  round(mem_limit / 1024 / 1024, 2) mem_limit_mb,
  freeze_cnt
FROM
  oceanbase.gv$memstore m
WHERE
  m.tenant_id = 1
ORDER BY ip ;

查看表在 MemStore 中内存占用

V3 版本用视图 gv$memstore_info

V4 该视图变成了gv$ob_memstore_info

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SELECT
  ip, 
  t.table_name,
  usec_to_time(base_version) base_version_time,
  round(used / 1024 / 1024, 1) AS used_mb,
  hash_items,
  btree_items,
  is_active
FROM
  gv$memstore_info m
JOIN gv$table t ON
  (m.tenant_id = t.tenant_id
    AND m.table_id = t.table_id)
WHERE
  t.tenant_id = 1
  AND t.database_name IN ('test')
ORDER BY
  m.ip,
  m.base_version DESC ;

每个表的分区在的转储和合并历史

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SELECT
  m.svr_ip,
  t.table_name,
  TYPE,
  ACTION,
  usec_to_time(version) version,
  start_time,
  end_time ,
  macro_block_count blocks
FROM
  gv$merge_info m
JOIN gv$table t ON
  (m.tenant_id = t.tenant_id
    AND m.table_id = t.table_id)
WHERE
  m.tenant_id = 1
  AND t.table_name IN ('test_table')
  AND t.database_name = 'test'
ORDER BY
  t.table_name,
  start_time DESC ;

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SELECT
  usec_to_time(request_time) req_time,
  tenant_name,
  svr_ip,
  user_name,
  db_name,
  ret_code,
  trace_id
FROM
  gv$sql_audit
WHERE
  tenant_id = 1
  AND user_name = 'root'
  AND ret_code IN (-4030,-4013)
ORDER BY
  request_id DESC
LIMIT 10
;

OB 的内存 Context 中，除了 MemStore 外，KVCache、PlanCache、WorkArea 等内存都可以通过视图查看

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SELECT
  tenant_id,
  svr_ip,
  cache_name,
  priority,
  round(cache_size / 1024 / 1024, 2) cache_mb,
  round(cache_store_size / 1024 / 1024, 2) cache_store_mb,
  round(cache_map_size / 1024 / 1024, 2) cache_map_mb,
  kv_cnt,
  hit_ratio
FROM
  oceanbase.__all_virtual_kvcache_info
WHERE
  tenant_id = 1
ORDER BY total_hit_cnt DESC ;

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SELECT
  tenant_id,
  svr_ip,
  sql_num,
  round(mem_used / 1024 / 1024, 2) mem_used_mb,
  round(mem_hold / 1024 / 1024, 2) mem_hold_mb,
  round(mem_limit / 1024 / 1024, 2) mem_limit_mb
FROM
  oceanbase.gv$plan_cache_stat
WHERE
  tenant_id = 1
ORDER BY
  mem_used DESC 
;

本文章参考自 OBCE V3 培训试验：内存管理分享 (qq.com) 文章写的很好故在自己的集群上做了测试。