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WAL in PostgreSQL: 4. Setup and Tuning
file (or writing to it) a special flag is set to indicate a need for synchronization
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WAL in PostgreSQL: 3. Checkpoint
files=2, longest=0.011 s, average=0.006 s; distance=1645 kB, estimate=1645 kB We can see here how many buffers were written, how the set of WAL files
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WAL in PostgreSQL: 2. Write-Ahead Log
files in the $PGDATA/pg_wal/ directory, but starting with PostgreSQL 10, you can also see them using a specialized function: => SELECT * FROM pg_ls_waldir() WHERE name = '000000010000000000000033'; name | size | modification --------------------------+----------+------------------------ 000000010000000000000033 | 16777216 | 2019
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WAL in PostgreSQL: 1. Buffer Cache
set them up. WAL setup and tuning — levels and problems solved, reliability, and performance. Many thanks to Elena Indrupskaya for the translation of these articles into English. Why do we need write-ahead
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MVCC in PostgreSQL — 8. Freezing
SET vacuum_freeze_table_age = 5; => SELECT pg_reload_conf(); Let's do freezing: => VACUUM tfreeze; Now, since the entire table was checked for sure, the ID of the frozen transaction
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MVCC in PostgreSQL — 6. Vacuum
SET maintenance_work_mem = '1MB'; => SELECT pg_reload_conf(); Let's start VACUUM and while it is working, let's access the pg_stat_progress_vacuum view several times: => VACUUM VERBOSE
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PostgreSQL monitoring using Zabbix Agent 2: easy and extensible
Set the connection parameters for the session in the configuration file zabbix_agent2.conf in the section
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MVCC in PostgreSQL — 3. Row Versions
files page by page, as with all others. So, when a transaction is committed, the "committed" bit is set for this
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MVCC in PostgreSQL — 2. Forks, files, pages
set of forks. And this doubles the number of files that correspond to a table
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MVCC in PostgreSQL — 1. Isolation
files, pages — what is happening at the physical level. Row versions , virtual transactions and subtransactions. Data snapshots and the visibility of row versions; the event horizon. In-page vacuum and HOT updates . Normal vacuum
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What is Baked in the Baker's Dozen?
set correctly when receiving the file descriptor for fsync() — directories are open only
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Indexes in PostgreSQL — 10 (Bloom)
set the probability of a false positive to 0.01 (having in mind that actually we will get more). The above formulas for n = 9 and N = 30,000,000 give the signature size
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Indexes in PostgreSQL — 9 (BRIN)
set traps" for new rows by freeing the space somewhere inside existing pages. Due to this, rows that otherwise would get to the end of file
pg_probackup 2.3.0 has been released
files to the underlying storage. The --note option allows to add a text note of size up to 1KB to the backup metadata when running backup and set-backup
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Indexes in PostgreSQL — 1
file and the position of the row inside the block. That said, with the known key or some information about it we can quickly read those rows that may contain the information of our interest