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SHOW PLANCACHE

Shows all query statements that MemSQL has compiled and executed, as well as cumulative query execution statistics associated with each plan.

SHOW PLANCACHE

Notes

Output

Column Description
Database Context database selected with USE <db_name> when query was compiled.
QueryText Query text with all numeric and string parameters replaced by tags (depending on parameter and/or query type). @ is used for integers and ^ for string parameters. ? is always used for INSERT queries.
Commits Number of successful executions of the query.
Rollbacks Number of unsuccessful executions of the query (i.e. if the query was aborted or it encountered runtime errors).
RowCount Cumulative number of rows returned by a SELECT query or the cumulative number of rows inserted, updated, or deleted for an INSERT, UPDATE, or DELETE query.
ExecutionTime Cumulative time (in milliseconds) spent executing the query.
LogBufferTime NULL for SELECT queries, otherwise the cumulative time (in milliseconds) spent waiting to reserve space in the transaction buffer for this query. A larger transaction buffer and faster disk can help reduce it.
LogFlushTime NULL for SELECT queries, otherwise the cumulative time (in milliseconds) spent waiting until changes made by this query are flushed to disk. A faster disk can help reduce it.
RowLockTime NULL for SELECT queries, otherwise the cumulative time (in milliseconds) spent waiting to acquire exclusive row locks.
StreamedRows (Cluster Only) Cumulative number of rows streamed from leaves and processed by the SELECT query.
LeafNetworkTime (Cluster Only) Cumulative time (in milliseconds) spent waiting for results from leaves. This includes the time spent executing queries on the leaves.
AverageMemoryUse The average amount of memory used to execute this query. Any temporary memory allocation needed to execute a query including those for hash tables, sorts, result tables, etc. is tracked here.

Example

memsql> SHOW PLANCACHE;
+----------+---------------------------------------+---------+-----------+----------+---------------+---------------+--------------+-------------+
| Database | QueryText                             | Commits | Rollbacks | RowCount | ExecutionTime | LogBufferTime | LogFlushTime | RowLockTime |
+----------+---------------------------------------+---------+-----------+----------+---------------+---------------+--------------+-------------+
| perf     | SELECT * FORM scans WHERE id = @      |     101 |         0 |       98 |             5 |          NULL |         NULL |        NULL |
| perf     | INSERT INTO scans VALUES (?, ?, ?, ?) |     120 |         0 |      120 |             9 |             0 |            0 |           0 |
+----------+---------------------------------------+---------+-----------+----------+---------------+---------------+--------------+-------------+
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