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| Query Type | Description |
|---|---|
| ALTER CLUSTER | Changes made to your cluster via the ALTER CLUSTER command are always logged to the query.log automatically. This logging is not controlled by a global variable. |
| BAD | The query read reads more rows than necessary to return the expected results. This may indicate a bad plan or missing index. Logging of BAD queries is not enabled by default (session_log_bad_queries). |
| DDL | The query is DDL (i.e. schema change such as CREATE, DROP, ALTER), or a SET GLOBAL or SESSION command. All DDL queries are initially logged by default (session_log_ddl). |
| SLOW | Query execution time exceeded the threshold specified by the variable session_log_slow_threshold_ms. This is enabled by default (session_log_slow_queries) and a value of 20 seconds is considered SLOW. |
| SQLERR | These database errors are things such as syntax errors, timeout notifications, and permission issues. All SQLERR queries will be logged by default (session_log_error_queries). |
Global and Session Variables
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| Name | Description | Default Value | Session Variable |
|---|---|---|---|
| session_log_bad_queries | Log BAD queries to the query.log. | false | |
| session_log_ddl | Log DDL statements to query.log. | true | |
| session_log_error_queries | Log ERROR statements to query.log. | true | |
| session_log_slow_queries | Log SLOW statements to query.log. | true | |
| session_log_slow_threshold_ms | Query duration threshold in milliseconds before logging this query. | 2000010000 | |
| session_log_users | Log users and LOGIN/LOGOUT to user.log. | false |
See User Logging for additional information on session_log_users.
| Anchor | ||||
|---|---|---|---|---|
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| Label | Description |
|---|---|
| reads | The number of times the database reads from a container. This may differ from the number of rows_read. |
| inserts | The number of times the database inserts into a container. This includes both the number of calls and the number of rows written. |
| deletes | The number of times the database deletes from a container. This includes both the number of calls and the number of rows deleted. |
| updates | The number of times the database updates a container. This includes both the number of calls and the number of rows updated. |
| counts | Number of calls by the query execution engine to operators BARRIER_ADD and BARRIER_FETCHADD. |
| rows_read | Total number of rows read to get all needed data for the query, including reads from indices. Essentially, the total number of rows processed by the last query. This may differ from from the number of rows_output by the query. |
| forwards | Number of rows forwarded to specific nodes. |
| broadcasts | Number of rows that were broadcast to all nodes. |
| rows_output | Total number of rows returned or output by the last query. This is usually the same as the number of rows returned from a query but may occasionally contain counts from internal processes. |
| semaphore_matches | Number of calls by the query execution engine to operator SEM_ACQUIRE. |
| fragment_executions | Number of query fragments executed for the query. |
| cpu_runtime_ns | This represents the aggregate total CPU time spent by all nodes to run the query. |
| cpu_waits | The number of times the query waited for another query to finish due to the Fair Scheduler. |
| cpu_waittime_ns | The amount of time spent waiting for CPU due to the Fair Scheduler. |
| barriers | Number of barriers created for the query. This is used to synchronize message communication between nodes. |
| barrier_forwards | Number of barriers created to synchronize messaging for forwarded rows. |
| barrier_flushes | Number of flush operations performed on barriers. |
| bm_fixes | Number of attempted page fixes by the Buffer Manager. |
| bm_loads | Number of pages loaded from disk by the Buffer Manager. |
| bm_waittime_ns | Nanoseconds spent blocked on Buffer Manager page fixes. |
| lockman_waits | Count of the number of times that the query had to wait for a lock to be released by another query. |
| lockman_waittime_ms | The total time spent waiting for other queries to release locks on needed rows. |
| trxstate_waits | Number of calls to trxstate_check that had to block. |
| trxstate_waittime_ms | Milliseconds spent blocked in trxstate_check. |
| wal_perm_waittime_ms | Milliseconds spent waiting because the WAL is more than 75% full. |
| bm_perm_waittime_ms | Milliseconds spent waiting for the Buffer Manager to grant write permission for pages. |
| sigmas | The number of sigma containers used by the query. |
| sigma_fallbacks | The number of sigma containers that ran out of memory and had to fall back to disk. |
| row_count | The total number of rows updated, inserted or deleted by the last query. |
| found_rows | The number of rows affected by the last statement, but not necessarily output by that statement . A value of 0 or -1 means no rows were found. |
| insert_id | Not currently being used, always displayed as 0. |
| fanout | Y/N indicator that tells if fanout was used for this query. |
| attempts | Number of attempts to automatically retry the query execution after it failed. |
| Note |
|---|
When ClustrixDB logs queries to query.log, the semicolon is stripped off. This means that any comments that are included with the statement are not logged. |
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