Progress Reporting

Tacnode has the ability to report the progress of certain commands during command execution. Currently, the only commands which support progress reporting are CREATE INDEX and COPY.

CREATE INDEX Progress Reporting

Whenever CREATE INDEX or REINDEX is running, the pg_stat_progress_create_index view will contain one row for each backend that is currently creating indexes. The tables below describe the information that will be reported and provide information about how to interpret it.

Table pg_stat_progress_create_index View

Column TypeDescription
`pid` `integer` Process ID of backend.
`datid` `oid` OID of the database to which this backend is connected.
`datname` `name` Name of the database to which this backend is connected.
`relid` `oid` OID of the table on which the index is being created.
`index_relid` `oid` OID of the index being created or reindexed. During a non-concurrent `CREATE INDEX`, this is 0.
`command` `text` The command that is running: `CREATE INDEX`, `CREATE INDEX CONCURRENTLY`, `REINDEX`, or `REINDEX CONCURRENTLY`.
`phase` `text` Current processing phase of index creation.
`lockers_total` `bigint` Total number of lockers to wait for, when applicable.
`lockers_done` `bigint` Number of lockers already waited for.
`current_locker_pid` `bigint` Process ID of the locker currently being waited for.
`blocks_total` `bigint` Total number of blocks to be processed in the current phase.
`blocks_done` `bigint` Number of blocks already processed in the current phase.
`tuples_total` `bigint` Total number of tuples to be processed in the current phase.
`tuples_done` `bigint` Number of tuples already processed in the current phase.
`partitions_total` `bigint` When creating an index on a partitioned table, this column is set to the total number of partitions on which the index is to be created. This field is `0` during a `REINDEX`.
`partitions_done` `bigint` When creating an index on a partitioned table, this column is set to the number of partitions on which the index has been created. This field is `0` during a `REINDEX`.

Table CREATE INDEX Phases

Phase	Description
`initializing`	`CREATE INDEX` or `REINDEX` is preparing to create the index. This phase is expected to be very brief.
`waiting for writers before build`	`CREATE INDEX CONCURRENTLY` or `REINDEX CONCURRENTLY` is waiting for transactions with write locks that can potentially see the table to finish. This phase is skipped when not in concurrent mode. Columns `lockers_total`, `lockers_done` and `current_locker_pid` contain the progress information for this phase.
`building index`	The index is being built by the access method-specific code. In this phase, access methods that support progress reporting fill in their own progress data, and the subphase is indicated in this column. Typically, `blocks_total` and `blocks_done` will contain progress data, as well as potentially `tuples_total` and `tuples_done`.
`waiting for writers before validation`	`CREATE INDEX CONCURRENTLY` or `REINDEX CONCURRENTLY` is waiting for transactions with write locks that can potentially write into the table to finish. This phase is skipped when not in concurrent mode. Columns `lockers_total`, `lockers_done` and `current_locker_pid` contain the progress information for this phase.
`index validation: scanning index`	`CREATE INDEX CONCURRENTLY` is scanning the index searching for tuples that need to be validated. This phase is skipped when not in concurrent mode. Columns `blocks_total` (set to the total size of the index) and `blocks_done` contain the progress information for this phase.
`index validation: sorting tuples`	`CREATE INDEX CONCURRENTLY` is sorting the output of the index scanning phase.
`index validation: scanning table`	`CREATE INDEX CONCURRENTLY` is scanning the table to validate the index tuples collected in the previous two phases. This phase is skipped when not in concurrent mode. Columns `blocks_total` (set to the total size of the table) and `blocks_done` contain the progress information for this phase.
`waiting for old snapshots`	`CREATE INDEX CONCURRENTLY` or `REINDEX CONCURRENTLY` is waiting for transactions that can potentially see the table to release their snapshots. This phase is skipped when not in concurrent mode. Columns `lockers_total`, `lockers_done` and `current_locker_pid` contain the progress information for this phase.
`waiting for readers before marking dead`	`REINDEX CONCURRENTLY` is waiting for transactions with read locks on the table to finish, before marking the old index dead. This phase is skipped when not in concurrent mode. Columns `lockers_total`, `lockers_done` and `current_locker_pid` contain the progress information for this phase.
`waiting for readers before dropping`	`REINDEX CONCURRENTLY` is waiting for transactions with read locks on the table to finish, before dropping the old index. This phase is skipped when not in concurrent mode. Columns `lockers_total`, `lockers_done` and `current_locker_pid` contain the progress information for this phase.

COPY Progress Reporting

Whenever COPY is running, the pg_stat_progress_copy view will contain one row for each backend that is currently running a COPY command. The table below describes the information that will be reported and provides information about how to interpret it.

Table 28.44. pg_stat_progress_copy View

Column TypeDescription
`pid` `integer` Process ID of backend.
`datid` `oid` OID of the database to which this backend is connected.
`datname` `name` Name of the database to which this backend is connected.
`relid` `oid` OID of the table on which the `COPY` command is executed. It is set to `0` if copying from a `SELECT` query.
`command` `text` The command that is running: `COPY FROM`, or `COPY TO`.
`type` `text` The io type that the data is read from or written to: `FILE`, `PROGRAM`, `PIPE` (for `COPY FROM STDIN` and `COPY TO STDOUT`), or `CALLBACK` (used for example during the initial table synchronization in logical replication).
`bytes_processed` `bigint` Number of bytes already processed by `COPY` command.
`bytes_total` `bigint` Size of source file for `COPY FROM` command in bytes. It is set to `0` if not available.
`tuples_processed` `bigint` Number of tuples already processed by `COPY` command.
`tuples_excluded` `bigint` Number of tuples not processed because they were excluded by the `WHERE` clause of the `COPY` command.

Progress Reporting