Postgresql 中文操作指南

Column Type

Description

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 being analyzed.

phase text

Current processing phase. See Table 28.38.

sample_blks_total bigint

Total number of heap blocks that will be sampled.

sample_blks_scanned bigint

Number of heap blocks scanned.

ext_stats_total bigint

Number of extended statistics.

ext_stats_computed bigint

Number of extended statistics computed. This counter only advances when the phase is computing extended statistics.

child_tables_total bigint

Number of child tables.

child_tables_done bigint

Number of child tables scanned. This counter only advances when the phase is acquiring inherited sample rows.

current_child_table_relid oid

OID of the child table currently being scanned. This field is only valid when the phase is acquiring inherited sample rows.

Phase

Description

initializing

The command is preparing to begin scanning the heap. This phase is expected to be very brief.

acquiring sample rows

The command is currently scanning the table given by relid to obtain sample rows.

acquiring inherited sample rows

The command is currently scanning child tables to obtain sample rows. Columns child_tables_total, child_tables_done, and current_child_table_relid contain the progress information for this phase.

computing statistics

The command is computing statistics from the sample rows obtained during the table scan.

computing extended statistics

The command is computing extended statistics from the sample rows obtained during the table scan.

finalizing analyze

The command is updating pg_class. When this phase is completed, ANALYZE will end.

Column Type

Description

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 being clustered.

command text

The command that is running. Either CLUSTER or VACUUM FULL.

phase text

Current processing phase. See Table 28.40.

cluster_index_relid oid

If the table is being scanned using an index, this is the OID of the index being used; otherwise, it is zero.

heap_tuples_scanned bigint

Number of heap tuples scanned. This counter only advances when the phase is seq scanning heap, index scanning heap or writing new heap.

heap_tuples_written bigint

Number of heap tuples written. This counter only advances when the phase is seq scanning heap, index scanning heap or writing new heap.

heap_blks_total bigint

Total number of heap blocks in the table. This number is reported as of the beginning of seq scanning heap.

heap_blks_scanned bigint

Number of heap blocks scanned. This counter only advances when the phase is seq scanning heap.

index_rebuild_count bigint

Number of indexes rebuilt. This counter only advances when the phase is rebuilding index.

Phase

Description

initializing

The command is preparing to begin scanning the heap. This phase is expected to be very brief.

seq scanning heap

The command is currently scanning the table using a sequential scan.

index scanning heap

CLUSTER is currently scanning the table using an index scan.

sorting tuples

CLUSTER is currently sorting tuples.

writing new heap

CLUSTER is currently writing the new heap.

swapping relation files

The command is currently swapping newly-built files into place.

rebuilding index

The command is currently rebuilding an index.

performing final cleanup

The command is performing final cleanup. When this phase is completed, CLUSTER or VACUUM FULL will end.

Column Type

Description

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.

Column Type

Description

pid integer

Process ID of the backend creating indexes.

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

Specific command type: CREATE INDEX, CREATE INDEX CONCURRENTLY, REINDEX, or REINDEX CONCURRENTLY.

phase text

Current processing phase of index creation. See Table 28.43.

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

Total number of partitions on which the index is to be created or attached, including both direct and indirect partitions. 0 during a REINDEX, or when the index is not partitioned.

partitions_done bigint

Number of partitions on which the index has already been created or attached, including both direct and indirect partitions. 0 during a REINDEX, or when the index is not partitioned.

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.

Column Type

Description

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 being vacuumed.

phase text

Current processing phase of vacuum. See Table 28.45.

heap_blks_total bigint

Total number of heap blocks in the table. This number is reported as of the beginning of the scan; blocks added later will not be (and need not be) visited by this VACUUM.

heap_blks_scanned bigint

Number of heap blocks scanned. Because the visibility map is used to optimize scans, some blocks will be skipped without inspection; skipped blocks are included in this total, so that this number will eventually become equal to heap_blks_total when the vacuum is complete. This counter only advances when the phase is scanning heap.

heap_blks_vacuumed bigint

Number of heap blocks vacuumed. Unless the table has no indexes, this counter only advances when the phase is vacuuming heap. Blocks that contain no dead tuples are skipped, so the counter may sometimes skip forward in large increments.

index_vacuum_count bigint

Number of completed index vacuum cycles.

max_dead_tuples bigint

Number of dead tuples that we can store before needing to perform an index vacuum cycle, based on maintenance_work_mem.

num_dead_tuples bigint

Number of dead tuples collected since the last index vacuum cycle.

Phase

Description

initializing

VACUUM is preparing to begin scanning the heap. This phase is expected to be very brief.

scanning heap

VACUUM is currently scanning the heap. It will prune and defragment each page if required, and possibly perform freezing activity. The heap_blks_scanned column can be used to monitor the progress of the scan.

vacuuming indexes

VACUUM is currently vacuuming the indexes. If a table has any indexes, this will happen at least once per vacuum, after the heap has been completely scanned. It may happen multiple times per vacuum if maintenance_work_mem (or, in the case of autovacuum, autovacuum_work_mem if set) is insufficient to store the number of dead tuples found.

vacuuming heap

VACUUM is currently vacuuming the heap. Vacuuming the heap is distinct from scanning the heap, and occurs after each instance of vacuuming indexes. If heap_blks_scanned is less than heap_blks_total, the system will return to scanning the heap after this phase is completed; otherwise, it will begin cleaning up indexes after this phase is completed.

cleaning up indexes

VACUUM is currently cleaning up indexes. This occurs after the heap has been completely scanned and all vacuuming of the indexes and the heap has been completed.

truncating heap

VACUUM is currently truncating the heap so as to return empty pages at the end of the relation to the operating system. This occurs after cleaning up indexes.

performing final cleanup

VACUUM is performing final cleanup. During this phase, VACUUM will vacuum the free space map, update statistics in pg_class, and report statistics to the cumulative statistics system. When this phase is completed, VACUUM will end.

Column Type

Description

pid integer

Process ID of a WAL sender process.

phase text

Current processing phase. See Table 28.47.

backup_total bigint

Total amount of data that will be streamed. This is estimated and reported as of the beginning of streaming database files phase. Note that this is only an approximation since the database may change during streaming database files phase and WAL log may be included in the backup later. This is always the same value as backup_streamed once the amount of data streamed exceeds the estimated total size. If the estimation is disabled in pg_basebackup (i.e., —​no-estimate-size option is specified), this is NULL.

backup_streamed bigint

Amount of data streamed. This counter only advances when the phase is streaming database files or transferring wal files.

tablespaces_total bigint

Total number of tablespaces that will be streamed.

tablespaces_streamed bigint

Number of tablespaces streamed. This counter only advances when the phase is streaming database files.

Phase

Description

initializing

The WAL sender process is preparing to begin the backup. This phase is expected to be very brief.

waiting for checkpoint to finish

The WAL sender process is currently performing pg_backup_start to prepare to take a base backup, and waiting for the start-of-backup checkpoint to finish.

estimating backup size

The WAL sender process is currently estimating the total amount of database files that will be streamed as a base backup.

streaming database files

The WAL sender process is currently streaming database files as a base backup.

waiting for wal archiving to finish

The WAL sender process is currently performing pg_backup_stop to finish the backup, and waiting for all the WAL files required for the base backup to be successfully archived. If either —​wal-method=none or —​wal-method=stream is specified in pg_basebackup, the backup will end when this phase is completed.

transferring wal files

The WAL sender process is currently transferring all WAL logs generated during the backup. This phase occurs after waiting for wal archiving to finish phase if —​wal-method=fetch is specified in pg_basebackup. The backup will end when this phase is completed.