Column Name | Type | Description |
|---|---|---|
query_id | bigint | Unique identifier of a query within a session, ascending |
start_time | timestamp(6) with local time zone | Time stamp of the start of VW query execution (millisecond precision) |
execution_time | interval day to second(6) | Total real time taken by the VW server expressed as an interval (millisecond precision) |
query_text | varchar(4000) | Text of the query as generated by the optimizer |
mem | bigint | Memory (in bytes) allocated by the query at end of execution |
mem_tot | bigint | Maximum amount of memory allocated by the query at any point of the execution |
mem_vm | bigint | Virtual memory address space reserved by the query at end of execution |
mem_tot_vm | bigint | Maximum amount of virtual memory address space reserved by the query at any point of execution |
Column Name | Type | Description |
|---|---|---|
query_id | bigint | Unique identifier of a query within a session, ascending |
op_id | integer | Identifier of a relational operator within a query tree, post-order starting with 1 |
name | varchar(20) | Name (type) of the operator (for example Select/Project/HashJoinN/etc) |
ticks | bigint | Execution time spent in this operator in CPU clock cycles |
cum_ticks | bigint | Execution time sped in this operator and all operators in its sub-tree |
in_tuples | bigint | Number of tuples on the input to this operator |
tuples | bigint | Number of tuples generated by the oprator |
himem | bigint | Maximum amount of memory allocated by this operator at any point in the execution (in bytes) |
qhimem | bigint | Maximum amount of memory allocated by the query |
level | integer | Level of the operator in the execution tree |
alloc_ticks | bigint | Time spent (in CPU clock cycles) to initialise the operator |
build_ticks | bigint | For HashTable based operators - time spent in Hash Table build phase |
probe_ticks | bigint | For HashTable based operators - time spent in Hash Table probe phase |
post_ticks | bigint | For HashTable based operators - time spent in Hash Table post phase |
est_cost | bigint | Execution cost (in arbitrary units) as estimated by the parallelization algorithm |
est_tuples | bigint | Generated number of tuples as estimated by the Ingres optimizer |
Column Name | Type | Description |
|---|---|---|
query_id | bigint | Unique identifier of a query within a session, ascending |
op_id | integer | Identifier of a relational operator within a query tree, pre-order, starting with 0 |
table | varchar(32) | Scanned table name |
columns | varchar(64) | Scanned column name |
async_fetch | bigint | Number asynchronous block requests generated by the scan |
async_miss | bigint | Number of asynchronous requests for blocks not found in the cache |
sync_fetch | bigint | Number of synchronous block requests generated by the scan |
sync_miss | bigint | Number of synchronous requests for blocks not found in the cache |
Column Name | Type | Description |
|---|---|---|
query_id | bigint | Unique identifier of a query within a session, ascending |
name | varchar(20) | Name of a stage. One of: • scanstate - query text tokenizer • parse - query text parser • rewrite - query execution tree rewriter • build - initializing execution operators • execute - actual query execution • profile - generating profile information • free - freeing the resources • total - total time of the above stages |
substage | varchar(20) | Name of a substage for rewrite stage |
ticks | bigint | Time spent in this stage in CPU clock cycles |
Column Name | Type | Description |
|---|---|---|
query_id | bigint | Unique identifier of a query within a session, ascending |
op_id | bigint | Identifier of a relational operator within a query tree, pre-order, starting with 0 |
ticks | bigint | Total time spent (in CPU clock cycles) in this function |
processed_cnt | bigint | Number of tuples processed |
call_cnt | bigint | Number of vectors processed |
function_name | varchar(60) | Function name |
name | varchar(30) | Name of the expression executing the function |
context | varchar(100) | Encoded names of functions in the expression tree and the operator executing this function |
Column Name | Type | Description |
|---|---|---|
query_id | bigint | Unique identifier of a query within a session, ascending |
is_operator | boolean | The node representing a relational operator |
name | varchar(24) | Name of the node type |
value | varchar(40) | Value stored in the node (depends on the type, for example function name or literal value) |
est_card | bigint | For operator nodes - output number of tuples estimated by the optimizer |
level | bigint | Level of the node in the tree |
node_num | bigint | Node index in the pre-order sequence |