Inspect the Current Configuration

Ocient® includes a variety of configuration settings that control how the system behaves. The vast majority of these won’t change in a typical deployment. However, there is a small set more commonly changed to adjust for different workloads, hardware, and operating requirements.

Configuration is primarily done through DDL or DCL and can be inspected using the System Catalog Reference.

You can contact Ocient Support to change configuration settings that apply across the entire system or to a subset of nodes. Each Ocient node reads configuration settings during startup. Therefore, configuration changes require restarts for the new values to take effect. For details, contact Ocient Support.

Inspecting System Configuration

Administrators typically need to know the effective configuration of the system and what has been overridden.

• Configuration Overrides — a list of the overrides applied by administrators
• Effective Configuration — the complete list of all configuration parameters and their current values on each node

Viewing Configuration Overrides

A system catalog table is provided that lists all DDL Configuration Overrides that are applied to the Ocient System. This table includes the configuration target type as well as the scope to which it is applied.

In the event that the scope is not SYSTEM (See Advanced Configuration for CLUSTER and NODE scopes), the scope_id will indicate the cluster_id or node_id to which the configuration override applies.

Example

The following query retrieves all config overrides applied on the system and provides a friendly node name or cluster name where an override is limited in scope:

SELECT
  cfg.scope_type,
  n.name AS node_name,
  c.name AS cluster_name,
  cfg.key,
  cfg.value
FROM
  sys.config cfg
  LEFT JOIN sys.nodes n
  ON n.id = cfg.scope_id and cfg.scope_type = 'NODE'
  LEFT JOIN sys.clusters c
  ON c.id = cfg.scope_id and cfg.scope_type = 'CLUSTER';

Output

scope_type                                   node_name                                    cluster_name                                 key                                          value
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
NODE                                         sales-lts8                                   NULL                                         lts.memory.warningHeapMemoryUsageRatio       0.93999999999999995
SYSTEM                                       NULL                                         NULL                                         lts.blobstoreParameters.coreMask             0b10000000000000000000
CLUSTER                                      NULL                                         storageCluster1                              lssParameters.nvmeParameters.useOpal         true
NODE                                         sales-lts8                                   NULL                                         lts.lssParameters.nvmeParameters.ioCoreMask  68719542272
SYSTEM                                       NULL                                         NULL                                         sql.pdfReservedMem                           137438953472
...

Viewing Effective Configuration Using System Table

A system catalog table is provided that lists the effective configuration of each node.

Example

The following query retrieves the effective overrides for the SQL role on the specified node:

SELECT
  n.name,
  nc.key,
  nc.value
FROM
  sys.node_config nc
  JOIN sys.nodes n
  ON nc.node_id = n.id
  WHERE n.name = 'sql0'
  AND key LIKE 'sql%';

Output

name                                         key                                          value
---------------------------------------------------------------------------------------------------------------------------------------
sql0                                         sql.blobstoreParameters.regionAllocationUnit 17179869184
sql0                                         sql.blobstoreParameters.pageUtilizationExpand 0.75
sql0                                         sql.blobstoreParameters.pageUtilizationContract 0.25
sql0                                         sql.blobstoreParameters.maxFileSize          0
sql0                                         sql.blobstoreParameters.minFileSize          128MiB
sql0                                         sql.blobstoreParameters.blobPageSize         128KiB
sql0                                         sql.blobstoreParameters.stripeWidth          0
sql0                                         sql.blobstoreParameters.coreMask             0b10000000
sql0                                         sql.cacheMinFreeMemoryPercent                0.109999999
sql0                                         sql.cacheMinSize                             4096
sql0                                         sql.cacheMinKeepTime                         720
sql0                                         sql.purgeCacheFrequency                      300
sql0                                         sql.pdfReservedMem                           0
sql0                                         sql.numLevels                                3
sql0                                         sql.maxShutdownWaitTime                      1800000
sql0                                         sql.shortQueryMillis                         -1
sql0                                         sql.timeLimit                                1800000
sql0                                         sql.forceNetworkedVirtualTables              false
sql0                                         sql.cacheLimit                               17179869184
sql0                                         sql.optimizer                                TKTOptimizer
sql0                                         sql.generator                                TKTPlanGenerator
sql0                                         sql.validator                                TKTValidator
sql0                                         sql.concurrencyTarget                        5

Viewing Effective Configuration Using REST Endpoints

Administrators can also view the effective system configuration using the config endpoint, a REST interface available on each node. This endpoint shows every configuration parameter for the node and its current value. It reflects the active values and might not reflect configuration overrides applied since the last node restart.

The config endpoint is found on each node at http://<node_hostname_or_ip_address>:9090/v1/config and it returns a JSON representation of the active system configuration of the targeted node.

Example

curl http://10.0.1.7:9090/v1/config

Output

{
    "siloType": "xg::runtime::physicalSiloSet_t",
    "tlbfsInfo.enabled": "true",
    "gdsClientParameters_t.batchTimer": "150000000n",
    "gdsClientParameters_t.maxBatchCount": "4096"
    ...
    "operatorvm.vmSiloMask": "0x3",
    "operatorvm.vmParameters.levels": "0x4",
    "operatorvm.vmParameters.statsCacheSize": "4GiB",
    "operatorvm.vmProtocolParameters.routerPollRate": "250000000n",
    "operatorvm.vmProtocolParameters.bufferedDatablockTimeout": "120000000000n"
    ...
    "lts.ioOpParameters.bufferPool.backingSlabSize": "2MiB",
    "lts.ioOpParameters.bufferPool.bufferPools[0].pool.size": "4KiB",
    "lts.ioOpParameters.bufferPool.bufferPools[0].pool.count": "98304",
    "lts.ioOpParameters.lbaCacheSize": "64",
    "lts.targetFillRatio": "1",
    "lts.pdfReservedMem": "4GiB"
    ...
}

Related Links

System Catalog