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docs: replace "stable storage" with "durable" in descriptions
For PG, "durable storage" has a clear meaning, while "stable storage" does not, so use the former. Discussion: https://postgr.es/m/20200817165222.GA31806@momjian.us Backpatch-through: 9.5
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‎doc/src/sgml/config.sgml

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@@ -2382,7 +2382,7 @@ include_dir 'conf.d'
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ensure data preservation even if a standby instance of
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<productname>PostgreSQL</> were to crash, but not if the standby
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suffers an operating-system-level crash, since the data has not
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necessarily reached stable storage on the standby.
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necessarily reached durable storage on the standby.
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Finally, the setting <literal>local</> causes commits to wait for
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local flush to disk, but not for replication. This is not usually
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desirable when synchronous replication is in use, but is provided for

‎doc/src/sgml/monitoring.sgml

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@@ -1375,11 +1375,11 @@ postgres 27093 0.0 0.0 30096 2752 ? Ss 11:34 0:00 postgres: ser
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</row>
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<row>
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<entry><literal>ControlFileSync</></entry>
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<entry>Waiting for the control file to reach stable storage.</entry>
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<entry>Waiting for the control file to reach durable storage.</entry>
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</row>
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<row>
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<entry><literal>ControlFileSyncUpdate</></entry>
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<entry>Waiting for an update to the control file to reach stable storage.</entry>
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<entry>Waiting for an update to the control file to reach durable storage.</entry>
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</row>
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<row>
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<entry><literal>ControlFileWrite</></entry>
@@ -1403,11 +1403,11 @@ postgres 27093 0.0 0.0 30096 2752 ? Ss 11:34 0:00 postgres: ser
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</row>
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<row>
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<entry><literal>DataFileFlush</></entry>
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<entry>Waiting for a relation data file to reach stable storage.</entry>
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<entry>Waiting for a relation data file to reach durable storage.</entry>
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</row>
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<row>
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<entry><literal>DataFileImmediateSync</></entry>
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<entry>Waiting for an immediate synchronization of a relation data file to stable storage.</entry>
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<entry>Waiting for an immediate synchronization of a relation data file to durable storage.</entry>
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</row>
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<row>
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<entry><literal>DataFilePrefetch</></entry>
@@ -1419,7 +1419,7 @@ postgres 27093 0.0 0.0 30096 2752 ? Ss 11:34 0:00 postgres: ser
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</row>
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<row>
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<entry><literal>DataFileSync</></entry>
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<entry>Waiting for changes to a relation data file to reach stable storage.</entry>
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<entry>Waiting for changes to a relation data file to reach durable storage.</entry>
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</row>
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<row>
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<entry><literal>DataFileTruncate</></entry>
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</row>
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<row>
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<entry><literal>LockFileAddToDataDirSync</></entry>
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<entry>Waiting for data to reach stable storage while adding a line to the data directory lock file.</entry>
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<entry>Waiting for data to reach durable storage while adding a line to the data directory lock file.</entry>
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</row>
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<row>
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<entry><literal>LockFileAddToDataDirWrite</></entry>
@@ -1451,7 +1451,7 @@ postgres 27093 0.0 0.0 30096 2752 ? Ss 11:34 0:00 postgres: ser
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</row>
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<row>
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<entry><literal>LockFileCreateSync</></entry>
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<entry>Waiting for data to reach stable storage while creating the data directory lock file.</entry>
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<entry>Waiting for data to reach durable storage while creating the data directory lock file.</entry>
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</row>
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<row>
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<entry><literal>LockFileCreateWrite</></entry>
@@ -1463,19 +1463,19 @@ postgres 27093 0.0 0.0 30096 2752 ? Ss 11:34 0:00 postgres: ser
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</row>
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<row>
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<entry><literal>LogicalRewriteCheckpointSync</></entry>
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<entry>Waiting for logical rewrite mappings to reach stable storage during a checkpoint.</entry>
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<entry>Waiting for logical rewrite mappings to reach durable storage during a checkpoint.</entry>
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</row>
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<row>
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<entry><literal>LogicalRewriteMappingSync</></entry>
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<entry>Waiting for mapping data to reach stable storage during a logical rewrite.</entry>
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<entry>Waiting for mapping data to reach durable storage during a logical rewrite.</entry>
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</row>
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<row>
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<entry><literal>LogicalRewriteMappingWrite</></entry>
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<entry>Waiting for a write of mapping data during a logical rewrite.</entry>
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</row>
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<row>
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<entry><literal>LogicalRewriteSync</></entry>
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<entry>Waiting for logical rewrite mappings to reach stable storage.</entry>
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<entry>Waiting for logical rewrite mappings to reach durable storage.</entry>
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</row>
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<row>
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<entry><literal>LogicalRewriteTruncate</></entry>
@@ -1491,7 +1491,7 @@ postgres 27093 0.0 0.0 30096 2752 ? Ss 11:34 0:00 postgres: ser
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</row>
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<row>
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<entry><literal>RelationMapSync</></entry>
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<entry>Waiting for the relation map file to reach stable storage.</entry>
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<entry>Waiting for the relation map file to reach durable storage.</entry>
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</row>
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<row>
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<entry><literal>RelationMapWrite</></entry>
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</row>
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<row>
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<entry><literal>ReplicationSlotRestoreSync</></entry>
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<entry>Waiting for a replication slot control file to reach stable storage while restoring it to memory.</entry>
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<entry>Waiting for a replication slot control file to reach durable storage while restoring it to memory.</entry>
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</row>
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<row>
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<entry><literal>ReplicationSlotSync</></entry>
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<entry>Waiting for a replication slot control file to reach stable storage.</entry>
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<entry>Waiting for a replication slot control file to reach durable storage.</entry>
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</row>
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<row>
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<entry><literal>ReplicationSlotWrite</></entry>
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<entry>Waiting for a write to a replication slot control file.</entry>
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</row>
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<row>
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<entry><literal>SLRUFlushSync</></entry>
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<entry>Waiting for SLRU data to reach stable storage during a checkpoint or database shutdown.</entry>
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<entry>Waiting for SLRU data to reach durable storage during a checkpoint or database shutdown.</entry>
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</row>
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<row>
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<entry><literal>SLRURead</></entry>
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<entry>Waiting for a read of an SLRU page.</entry>
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</row>
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<row>
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<entry><literal>SLRUSync</></entry>
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<entry>Waiting for SLRU data to reach stable storage following a page write.</entry>
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<entry>Waiting for SLRU data to reach durable storage following a page write.</entry>
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</row>
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<row>
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<entry><literal>SLRUWrite</></entry>
@@ -1547,15 +1547,15 @@ postgres 27093 0.0 0.0 30096 2752 ? Ss 11:34 0:00 postgres: ser
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</row>
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<row>
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<entry><literal>SnapbuildSync</></entry>
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<entry>Waiting for a serialized historical catalog snapshot to reach stable storage.</entry>
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<entry>Waiting for a serialized historical catalog snapshot to reach durable storage.</entry>
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</row>
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<row>
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<entry><literal>SnapbuildWrite</></entry>
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<entry>Waiting for a write of a serialized historical catalog snapshot.</entry>
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</row>
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<row>
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<entry><literal>TimelineHistoryFileSync</></entry>
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<entry>Waiting for a timeline history file received via streaming replication to reach stable storage.</entry>
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<entry>Waiting for a timeline history file received via streaming replication to reach durable storage.</entry>
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</row>
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<row>
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<entry><literal>TimelineHistoryFileWrite</></entry>
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</row>
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<row>
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<entry><literal>TimelineHistorySync</></entry>
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<entry>Waiting for a newly created timeline history file to reach stable storage.</entry>
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<entry>Waiting for a newly created timeline history file to reach durable storage.</entry>
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</row>
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<row>
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<entry><literal>TimelineHistoryWrite</></entry>
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</row>
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<row>
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<entry><literal>TwophaseFileSync</></entry>
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<entry>Waiting for a two phase state file to reach stable storage.</entry>
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<entry>Waiting for a two phase state file to reach durable storage.</entry>
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</row>
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<row>
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<entry><literal>TwophaseFileWrite</></entry>
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<entry>Waiting for a write of a two phase state file.</entry>
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</row>
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<row>
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<entry><literal>WALBootstrapSync</></entry>
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<entry>Waiting for WAL to reach stable storage during bootstrapping.</entry>
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<entry>Waiting for WAL to reach durable storage during bootstrapping.</entry>
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</row>
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<row>
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<entry><literal>WALBootstrapWrite</></entry>
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</row>
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<row>
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<entry><literal>WALCopySync</></entry>
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<entry>Waiting a new WAL segment created by copying an existing one to reach stable storage.</entry>
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<entry>Waiting a new WAL segment created by copying an existing one to reach durable storage.</entry>
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</row>
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<row>
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<entry><literal>WALCopyWrite</></entry>
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<entry>Waiting for a write when creating a new WAL segment by copying an existing one.</entry>
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</row>
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<row>
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<entry><literal>WALInitSync</></entry>
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<entry>Waiting for a newly initialized WAL file to reach stable storage.</entry>
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<entry>Waiting for a newly initialized WAL file to reach durable storage.</entry>
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</row>
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<row>
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<entry><literal>WALInitWrite</></entry>
@@ -1623,7 +1623,7 @@ postgres 27093 0.0 0.0 30096 2752 ? Ss 11:34 0:00 postgres: ser
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</row>
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<row>
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<entry><literal>WALSyncMethodAssign</></entry>
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<entry>Waiting for data to reach stable storage while assigning WAL sync method.</entry>
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<entry>Waiting for data to reach durable storage while assigning WAL sync method.</entry>
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</row>
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<row>
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<entry><literal>WALWrite</></entry>

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