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查看内存的使用信息
更新时间：2026-07-29 10:39:50
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本文介绍了使用虚拟表和日志内容查看内存使用信息的方式。
视图查询
查询 OBServer 节点总内存
在 sys 租户下，通过查询 oceanbase.gv$sysstat 视图可以查看指定机器的内存占用，示例如下：
obclient> SELECT * FROM oceanbase.gv$sysstat WHERE svr_ip = 'xx.xx.xx.xx' AND svr_port=2882 AND con_id=1 AND name like '%observer memory%';
+--------+----------------+----------+------------+---------------------------+-------+-------------+------------+---------+
| CON_ID | SVR_IP | SVR_PORT | STATISTIC# | NAME | CLASS | VALUE | VALUE_TYPE | STAT_ID |
+--------+----------------+----------+------------+---------------------------+-------+-------------+------------+---------+
| 1 | xx.xx.xx.xx | 2882 | 568 | observer memory used size | 64 | 12735815680 | SET_VALUE | 140008 |
| 1 | xx.xx.xx.xx | 2882 | 569 | observer memory free size | 64 | 224395264 | SET_VALUE | 140009 |
| 1 | xx.xx.xx.xx | 2882 | 571 | observer memory hold size | 64 | 12960210944 | SET_VALUE | 140011 |
+--------+----------------+----------+------------+---------------------------+-------+-------------+------------+---------+
3 rows in set
查看各个租户内存使用总量
在 sys 租户下，通过查询 oceanbase.GV$OB_TENANT_MEMORY 视图可以查看所有租户的内存使用总量。
obclient> SELECT tenant_id, hold FROM oceanbase.GV$OB_TENANT_MEMORY WHERE svr_ip = 'xx.xx.xx.xx' AND svr_port=2882 GROUP BY tenant_id;
+-----------+------------+
| tenant_id | hold |
+-----------+------------+
| 1 | 1308491776 |
| 21 | 0 |
| 500 | 8969994240 |
| 506 | 2097152 |
| 507 | 2097152 |
| 508 | 18874368 |
| 509 | 2097152 |
| 510 | 2097152 |
| 512 | 2097152 |
| 999 | 2097152 |
| 1001 | 524156928 |
| 1002 | 593408000 |
| 1003 | 522059776 |
| 1004 | 771678208 |
+-----------+------------+
14 rows in set
查看指定租户的内存使用详情
在 sys 租户下，通过查询 oceanbase.GV$OB_MEMORY 视图，可以查看指定租户的内存使用详情。
obclient> SELECT tenant_id, CTX_NAME, hold FROM oceanbase.GV$OB_MEMORY WHERE svr_ip = 'xx.xx.xx.xx' AND svr_port=2882 AND tenant_id = 1002 GROUP BY CTX_NAME;
+-----------+-----------------+-----------+
| tenant_id | CTX_NAME | hold |
+-----------+-----------------+-----------+
| 1002 | APPLY_STATUS | 8128 |
| 1002 | CACHE_MAP_NODE | 16646144 |
| 1002 | ClogGe | 311296 |
| 1002 | ColUsagHashMap | 212736 |
| 1002 | DDLKvMgrObj | 524288 |
| 1002 | DeadLock | 8128 |
| 1002 | DmlStatMap | 212688 |
| 1002 | FlushLog | 65536 |
| 1002 | FlushMeta | 8128 |
| 1002 | GtsTaskQueue | 286720 |
| 1002 | HashBuckLCSta | 1589248 |
| 1002 | HashBuckPlanCac | 794624 |
| 1002 | HashBuckPsCache | 1187840 |
| 1002 | HashBuckPsInfo | 1187840 |
| 1002 | HashNode | 7968 |
| 1002 | HashNodeLCSta | 111104 |
| 1002 | HashNodePlanCac | 55552 |
| 1002 | HashNodePsCache | 7968 |
| 1002 | HashNodePsInfo | 7936 |
| 1002 | IdxBlkTreePath | 89280 |
| 1002 | LobAllocator | 65536 |
| 1002 | LockMemObj | 65536 |
| 1002 | LockWaitMgr | 8128 |
| 1002 | LogApplyStatus | 13568 |
| 1002 | LogGroupBuffer | 83927040 |
| 1002 | LogReplayStatus | 32768 |
| 1002 | LOG_HASH_MAP | 1120 |
| 1002 | LSMap | 4249664 |
| 1002 | LSSvr | 269248 |
| 1002 | MatchOffsetMap | 16256 |
| 1002 | Memstore | 64503808 |
| 1002 | MemtableCallbac | 260096 |
| 1002 | MemTblMgrObj | 393216 |
| 1002 | MemTblObj | 1048576 |
| 1002 | MetaAllocator | 14385792 |
| 1002 | MysqlRequesReco | 86261760 |
| 1002 | OmtTenant | 10674448 |
| 1002 | PartTranCtxMgr | 802816 |
| 1002 | PlanBaselineMgr | 96 |
| 1002 | PoolFreeList | 5250880 |
| 1002 | QueryAllocator | 16256 |
| 1002 | REPLAY_STATUS | 8128 |
| 1002 | SqlDtl | 3907584 |
| 1002 | SqlMemMgr | 24272 |
| 1002 | SqlPhyPlan | 143297472 |
| 1002 | SqlPhyPlObj | 1099840 |
| 1002 | SqlPlanCache | 7868160 |
| 1002 | SqlPlanMon | 5021696 |
| 1002 | SqlPsCache | 4144 |
| 1002 | SSTblObj | 2097152 |
| 1002 | TabletObj | 1638400 |
| 1002 | thread_factor | 32768 |
| 1002 | TxCtxMemObj | 65536 |
| 1002 | TxDataMemObj | 65536 |
| 1002 | TX_DATA_TABLE | 1815104 |
+-----------+-----------------+-----------+
55 rows in set
查看某个内存模块中内存的使用详情
在 sys 租户下，通过查询 oceanbase.GV$OB_MEMORY，可以查看某个内存模块中内存的使用详情。也可以指定机器、租户等信息来查询。
obclient> SELECT * FROM oceanbase.GV$OB_MEMORY WHERE svr_ip = 'xx.xx.xx.xx' AND svr_port=2882 AND tenant_id = 1002 ORDER BY hold desc limit 10;
+-----------+----------------+----------+-------------------+-----------------+-------+------------+-----------+
| TENANT_ID | SVR_IP | SVR_PORT | CTX_NAME | MOD_NAME | COUNT | HOLD | USED |
+-----------+----------------+----------+-------------------+-----------------+-------+------------+-----------+
| 1002 | xx.xx.xx.xx | 2882 | KVSTORE_CACHE_ID | KvstorCacheMb | 498 | 1044381696 | 0 |
| 1002 | xx.xx.xx.xx | 2882 | PLAN_CACHE_CTX_ID | SqlPhyPlan | 7069 | 135522752 | 120440953 |
| 1002 | xx.xx.xx.xx | 2882 | DEFAULT_CTX_ID | MysqlRequesReco | 11 | 100827136 | 100797440 |
| 1002 | xx.xx.xx.xx | 2882 | DEFAULT_CTX_ID | IoControl | 37 | 100143104 | 100086048 |
| 1002 | xx.xx.xx.xx | 2882 | DEFAULT_CTX_ID | LogGroupBuffer | 2 | 83927040 | 83886080 |
| 1002 | xx.xx.xx.xx | 2882 | CO_STACK | CoStack | 156 | 79233024 | 79082016 |
| 1002 | xx.xx.xx.xx | 2882 | DEFAULT_CTX_ID | ServerObjecPool | 1 | 63983616 | 63963136 |
| 1002 | xx.xx.xx.xx | 2882 | MEMSTORE_CTX_ID | Memstore | 21 | 43696128 | 43676136 |
| 1002 | xx.xx.xx.xx | 2882 | DEFAULT_CTX_ID | SqlDtl | 191 | 23449216 | 21915426 |
| 1002 | xx.xx.xx.xx | 2882 | DEFAULT_CTX_ID | SqlPlanManger | 54 | 23281664 | 22815744 |
+-----------+----------------+----------+-------------------+-----------------+-------+------------+-----------+
10 rows in set
日志查询
查询 OBServer 节点总内存
登录 OBServer 节点所在的机器。
执行以下命令，进入日志文件所在的目录。
cd ~/oceanbase/log执行以下命令，查询 OBServer 节点总内存使用情况。
grep CHUNK_MGR observer.log查询结果如下：
[2022-07-14 09:29:26.243252] INFO [STORAGE] print_tenant_usage (ob_tenant_memory_printer.cpp:121) [104667][ServerGTimer][T0][Y0-0000000000000000-0-0] [lt=6] [CHUNK_MGR] free=42 pushes=2504440 pops=2504398 limit= 85,899,345,920 hold= 10,254,864,384 total_hold= 10,655,629,312 used= 10,166,784,000 freelist_hold= 88,080,384 maps= 159,816 unmaps= 156,719 large_maps= 156,935 large_unmaps= 156,719 memalign=0 virtual_memory_used= 11,851,849,728 [2022-07-14 09:29:36.309803] INFO [STORAGE] print_tenant_usage (ob_tenant_memory_printer.cpp:121) [104667][ServerGTimer][T0][Y0-0000000000000000-0-0] [lt=11] [CHUNK_MGR] free=39 pushes=2504609 pops=2504570 limit= 85,899,345,920 hold= 10,254,864,384 total_hold= 10,655,629,312 used= 10,173,075,456 freelist_hold= 81,788,928 maps= 159,826 unmaps= 156,729 large_maps= 156,945 large_unmaps= 156,729 memalign=0 virtual_memory_used= 11,851,849,728 [2022-07-14 09:29:46.376095] INFO [STORAGE] print_tenant_usage (ob_tenant_memory_printer.cpp:121) [104667][ServerGTimer][T0][Y0-0000000000000000-0-0] [lt=6] [CHUNK_MGR] free=36 pushes=2504774 pops=2504738 limit= 85,899,345,920 hold= 10,254,864,384 total_hold= 10,655,629,312 used= 10,179,366,912 freelist_hold= 75,497,472 maps= 159,836 unmaps= 156,739 large_maps= 156,955 large_unmaps= 156,739 memalign=0 virtual_memory_used= 11,851,849,728 [2022-07-14 09:29:56.455361] INFO [STORAGE] print_tenant_usage (ob_tenant_memory_printer.cpp:121) [104667][ServerGTimer][T0][Y0-0000000000000000-0-0] [lt=9] [CHUNK_MGR] free=33 pushes=2504938 pops=2504905 limit= 85,899,345,920 hold= 10,254,864,384 total_hold= 10,655,629,312 used= 10,185,658,368 freelist_hold= 69,206,016 maps= 159,846 unmaps= 156,749 large_maps= 156,965 large_unmaps= 156,749 memalign=0 virtual_memory_used= 11,851,849,728 [2022-07-14 09:30:06.520032] INFO [STORAGE] print_tenant_usage (ob_tenant_memory_printer.cpp:121) [104667][ServerGTimer][T0][Y0-0000000000000000-0-0] [lt=7] [CHUNK_MGR] free=32 pushes=2505099 pops=2505067 limit= 85,899,345,920 hold= 10,254,864,384 total_hold= 10,655,629,312 used= 10,187,755,520 freelist_hold= 67,108,864 maps= 159,856 unmaps= 156,759 large_maps= 156,975 large_unmaps= 156,759 memalign=0 virtual_memory_used= 11,851,849,728 [2022-07-14 09:30:16.586924] INFO [STORAGE] print_tenant_usage (ob_tenant_memory_printer.cpp:121) [104667][ServerGTimer][T0][Y0-0000000000000000-0-0] [lt=8] [CHUNK_MGR] free=32 pushes=2505261 pops=2505229 limit= 85,899,345,920 hold= 10,254,864,384 total_hold= 10,655,629,312 used= 10,187,755,520 freelist_hold= 67,108,864 maps= 159,866 unmaps= 156,769 large_maps= 156,985 large_unmaps= 156,769 memalign=0 virtual_memory_used= 11,851,849,728日志信息中的部分参数说明如下表所示。
参数 说明 limit OBServer 节点总内存限制 hold OBServer 节点从操作系统获取到的所有的内存 used OBServer 节点实际使用到的内存（包括 Cache） freelist_hold OBServer 节点未使用的内存
查看各个租户的内存使用总量
登录 OBServer 节点所在的机器。
执行以下命令，进入日志文件所在的目录。
cd ~/oceanbase/log执行以下命令，查看各租户的内存使用总量。
grep ob_malloc_allocator.cpp observer.log查询的部分结果如下：
[2022-07-14 09:29:26.241149] INFO [LIB] operator() (ob_malloc_allocator.cpp:387) [104667][ServerGTimer][T0][Y0-0000000000000000-0-0] [lt=8] [MEMORY] tenant: 500, limit: 9,223,372,036,854,775,807 hold: 6,765,867,008 rpc_hold: 0 cache_hold: 0 cache_used: 0 cache_item_count: 0 [2022-07-14 09:29:26.241729] INFO [LIB] operator() (ob_malloc_allocator.cpp:387) [104667][ServerGTimer][T1][Y0-0000000000000000-0-0] [lt=10] [MEMORY] tenant: 1, limit: 17,179,869,184 hold: 1,170,079,744 rpc_hold: 0 cache_hold: 144,703,488 cache_used: 144,703,488 cache_item_count: 69 [2022-07-14 09:29:26.242025] INFO [LIB] operator() (ob_malloc_allocator.cpp:387) [104667][ServerGTimer][T1001][Y0-0000000000000000-0-0] [lt=5] [MEMORY] tenant: 1001, limit: 1,073,741,824 hold: 511,574,016 rpc_hold: 0 cache_hold: 218,103,808 cache_used: 218,103,808 cache_item_count: 104 [2022-07-14 09:29:26.242321] INFO [LIB] operator() (ob_malloc_allocator.cpp:387) [104667][ServerGTimer][T1002][Y0-0000000000000000-0-0] [lt=8] [MEMORY] tenant: 1002, limit: 6,442,450,944 hold: 534,687,744 rpc_hold: 0 cache_hold: 44,040,192 cache_used: 44,040,192 cache_item_count: 21 [2022-07-14 09:29:26.242625] INFO [LIB] operator() (ob_malloc_allocator.cpp:387) [104667][ServerGTimer][T1003][Y0-0000000000000000-0-0] [lt=4] [MEMORY] tenant: 1003, limit: 1,073,741,824 hold: 511,574,016 rpc_hold: 0 cache_hold: 224,395,264 cache_used: 224,395,264 cache_item_count: 107 [2022-07-14 09:29:26.242901] INFO [LIB] operator() (ob_malloc_allocator.cpp:387) [104667][ServerGTimer][T1004][Y0-0000000000000000-0-0] [lt=8] [MEMORY] tenant: 1004, limit: 6,442,450,944 hold: 633,266,176 rpc_hold: 0 cache_hold: 65,011,712 cache_used: 65,011,712 cache_item_count: 31 [2022-07-14 09:29:36.307729] INFO [LIB] operator() (ob_malloc_allocator.cpp:387) [104667][ServerGTimer][T0][Y0-0000000000000000-0-0] [lt=10] [MEMORY] tenant: 500, limit: 9,223,372,036,854,775,807 hold: 6,765,867,008 rpc_hold: 0 cache_hold: 0 cache_used: 0 cache_item_count: 0
查看某个租户内存使用详情
登录 OBServer 节点所在的机器。
执行以下命令，进入日志文件所在的目录。
cd ~/oceanbase/log进行以下操作，查看
tenant_id为1002的租户的内存使用总量。使用 Vim 打开
observer.log。搜索
ob_malloc_allocator.cpp.*1002。[MEMORY] ctx_id= DEFAULT_CTX_ID hold_bytes= 258,838,528 limit= 9,223,372,036,854,775,807 [MEMORY] ctx_id= MEMSTORE_CTX_ID hold_bytes= 67,108,864 limit= 9,223,372,036,854,775,807 [MEMORY] ctx_id= TRANS_CTX_MGR_ID hold_bytes= 2,097,152 limit= 9,223,372,036,854,775,807 [MEMORY] ctx_id= PLAN_CACHE_CTX_ID hold_bytes= 132,120,576 limit= 9,223,372,036,854,775,807 [MEMORY] ctx_id= WORK_AREA hold_bytes= 4,194,304 limit= 322,122,545 [MEMORY] ctx_id= META_OBJ_CTX_ID hold_bytes= 22,093,824 limit= 644,245,090 [MEMORY] ctx_id= TX_CALLBACK_CTX_ID hold_bytes= 2,097,152 limit= 9,223,372,036,854,775,807 [MEMORY] ctx_id= LOB_CTX_ID hold_bytes= 2,097,152 limit= 9,223,372,036,854,775,807
查看某个内存模块的内存使用详情
登录 OBServer 节点所在的机器。
执行以下命令，进入日志文件所在的目录。
cd ~/oceanbase/log进行以下操作，查看
tenant_id为1002的租户的DEFAULT_CTX_ID模块的内存使用详情。使用 Vim 打开
observer.log。搜索
MEMORY.*1002.*DEFAULT_CTX_ID。[MEMORY] tenant_id= 1002 ctx_id= DEFAULT_CTX_ID hold= 258,838,528 used= 216,411,808 limit= 9,223,372,036,854,775,807 [MEMORY] idle_size= 0 free_size= 0 [MEMORY] wash_related_chunks= 0 washed_blocks= 0 washed_size= 0 [MEMORY] hold= 86,261,760 used= 86,239,232 count= 4 avg_used= 21,559,808 mod=MysqlRequesReco [MEMORY] hold= 83,927,040 used= 83,886,080 count= 2 avg_used= 41,943,040 mod=LogGroupBuffer [MEMORY] hold= 16,646,144 used= 16,637,952 count= 8 avg_used= 2,079,744 mod=CACHE_MAP_NODE [MEMORY] hold= 10,674,448 used= 10,631,028 count= 42 avg_used= 253,119 mod=OmtTenant [MEMORY] hold= 5,021,696 used= 4,977,920 count= 3 avg_used= 1,659,306 mod=SqlPlanMon [MEMORY] hold= 4,249,664 used= 4,229,120 count= 2 avg_used= 2,114,560 mod=LSMap [MEMORY] hold= 1,589,248 used= 1,573,024 count= 2 avg_used= 786,512 mod=HashBuckLCSta [MEMORY] hold= 1,571,264 used= 1,558,656 count= 197 avg_used= 7,911 mod=TX_DATA_TABLE [MEMORY] hold= 1,548,288 used= 1,383,795 count= 21 avg_used= 65,895 mod=SqlDtl [MEMORY] hold= 1,187,840 used= 1,179,768 count= 1 avg_used= 1,179,768 mod=HashBuckPsInfo [MEMORY] hold= 1,187,840 used= 1,179,768 count= 1 avg_used= 1,179,768 mod=HashBuckPsCache [MEMORY] hold= 794,624 used= 786,512 count= 1 avg_used= 786,512 mod=HashBuckPlanCac
