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Re: ERROR: unexpected chunk number 0 (expected 1) for toast value 76753264 in pg_toast_10920100

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Hi Tom,

Thanks for attempting to replicate the issue.

Anyway, the bad news is I couldn't reproduce the problem then and I can't
now.  I don't know if it's a timing issue or if there's something critical
about configuration that I'm not duplicating.  Can you explain what sort
of platform you're testing on, and what nondefault configuration settings
you're using?

Further details about the environment that I can replicate on below:

- Non default postgresql.conf settings:
checkpoint_segments = 192
checkpoint_completion_target = 0.9
checkpoint_timeout = 5min
wal_keep_segments = 256
wal_writer_delay = 200ms
archive_mode = on
archive_command = 'rsync -e ssh -arv  /wal/pg_xlog/%f postgres@<removed hostname>:/wal/pg_xlog'
archive_timeout = 60
syslog_facility = 'LOCAL0'
log_statement = 'mod'
syslog_ident = 'postgres'
log_line_prefix = '%h %m  %p %c %u %a  %e '
log_timezone = 'GB'
track_activities = on
track_counts = on
datestyle = 'iso, mdy'
timezone = 'GB'
default_text_search_config = 'pg_catalog.english'
array_nulls = on
sql_inheritance = on
standard_conforming_strings = on
synchronize_seqscans = on
transform_null_equals = off
- Two node master/slave setup using streaming replication (without slots).
- CentOS 6.9 (2.6.32-696.el6.x86_64).
- PostgreSQL 9.4.10 on x86_64-unknown-linux-gnu, compiled by gcc (GCC) 4.4.7 20120313 (Red Hat 4.4.7-17), 64-bit.
- 64GiB RAM.
- AMD Opteron(TM) Processor 6238.
- pg_default sat on 2 disk RAID-1 conifugration (ext3 filesystem).
- Custom tablespaces (where the errors occur) sat on 4 disk RAID-10 (ext3 filesystem).
- All disks are HP 600G SAS 6.0Gbps with P420(i) controllers and battery backed cache enabled.

Please let me know if you require further info.

Best wishes,
Harry



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